[147] B. S. Choi, J. S. Jeong, K. H. Yoon, K. S. Kim, H. S. Kim, M. R. Park, O. K. Kwon, H. K. Lee, Y. C. Chung, "Evaluation of Chirp Reduction in Polymer-Based Tunable External-Cavity Lasers," IEEE Journal of Quantum Electronics, vol. 51, no. 1, Jan. 2015.

[146] U. H. Hong, H. G. Choi, Hoon Kim, Y. C. Chung, "Simple carrier-phase estimator for high-speed RSOA-based coherent WDM PON", Optics Express, vol. 22, no. 25, pp. 30975-30982, Dec. 2014.

[142] K. Y. Cho, U. H. Hong, H. G. Choi, and Y. C. Chung,  " Maximum operable speed of WDM PON employing bandwidth-limited RSOAs ," Optics Communication, vol. 312, pp. 159-162, Feb. 2014.

[141] O. K. Kwon, Y. S. Baek, Y. C. Chung, and H. M. Park, " Proposal and Analysis of Distributed Reflector-Laser Diode Integrated with an Electroabsorption Modulator ," ETRI Journal, vol. 35, no. 3, pp. 459-468, June 2013.

[140] J. H. Chang, H. G. Choi, and Y. C. Chung, " Achievable capacity improvement by using multi-level modulation format in trench-assisted multi-core fiber system ," Optcis Express, vol. 21, no. 12, pp. 14262-14271, June 2013.

[139] H. K. Shim, K. Y. Cho, U. H. Hong, and Y. C. Chung, " Transmission of 40-Gb/s QPSK upstream signal in RSOA-based coherent WDM PON using offset PDM technique ," Optcis Express, vol. 21, no. 3, pp. 3721-3725, Feb. 2013.

[138] O. K. Kwon, Y. S. Baek, and Y. C. Chung, " Electroabsorption Modulated Laser With High Immunity to Residual Facet Reflection ," IEEE Journal of Quantum Electronics, vol. 48, no. 9, pp. 1203-1213, Sep. 2012.

[137] B. S. Choi, S. H. Oh, K. S. Kim, K. H. Yoon, H. S. Kim, M. R. Park, J. S. Jeong, O. K. Kwon, H. K. Lee, and Y. C. Chung, " 10-Gb/s direct modulation of polymer-based tunable external cavity lasers ," Optcis Express, vol. 20, no. 18, pp. 20368-20375, Aug. 2012.

[136] K. Y. Cho, U. H. Hong, S. P. Jung, Y. Takushima, A. Aagata, T. Sano, Y. Horiuchi, M. Suzuki, and Y. C. Chung, " Long-reach 10-Gb/s RSOA-based WDM PON employing QPSK signal and coherent receiver ," Optcis Express, vol. 20, no. 14, pp. 15353-15358, July 2012.

[135] O. K. Kwon, Y. T. Han, Y. S. Baek, and Y. C. Chung, " Improvement of modulation bandwidth in electroabsorption-modulated laser by utilizing the resonance property in bonding wire ," Optcis Express, vol. 20, no. 11, pp. 11806-11812, May 2012.

[134] H. K. Shim, K. Y. Cho, Y. Takushima, and Y. C. Chung, " Correlation-based OTDR for in-service monitoring of 64-split TDM PON ," Optcis Express, vol. 20, no. 5, pp. 4921-4926, Feb. 2012.

[133] K. Y. Cho, U. H. Hong, Y. Takushima, A. Agata, T. Sano, M. Suzuki, and Y. C. Chung, " 103-Gb/s long-reach WDM PON implemented by using directly-modulated RSOAs ," IEEE Photonics Technology Letter, vol. 24, no. 3, pp. 209-211, Feb. 2012.

[132] Oh Kee Kwon, Young Ahn Leem, Dong Hun Lee, Chul Wook Lee, Yong Soon Baek, and Yun C. Chung, " Effects of Asymmetric Grating Structures on Output Efficiency and Single Longitudinal Mode Operation in λ/4-Shifted DFB Laser ," IEEE Journal of Quantum Electronics, vol. 47, no. 9, pp. 1185-1194, Sep. 2011.

[131] K. Y. Cho, B. S. Choi, Y. Takushima, and Y. C. Chung, "25.78-Gb/s Operation of RSOA for next-generation optical access networks," IEEE Photonics Technology Letter, vol. 23, no. 8, pp. 495-497, Apr. 2011.

[130] K. Y. Cho, K. Tanaka, T. Sano, S. P. Jung, J. H. Chang, Y. Takushima, A. Agata, Y. Horiuchi, M. Suzuki, and Y. C. Chung, "Long-reach coherent WDM PON employing self-polarization-stabilization technique," IEEE/OSA Journal of Lightwave Technology, vol. 29, no. 4, pp. 456-462, Feb. 2011.

[129] B. Basch, J. Cartledge, M. Esfandiari, S. Hamilton, R. Jopson, P. Andrekson, L. Barry, Y. C. Chung, K. Kitayama, J. Nicholson, V. Shukla, Y. Vlasov, and A.Yablon, "A snapshot of optical communications," Optics and Photonics News, vol. 21, no. 1, pp. 24-30, Jan. 2010.

[128] K. Y. Cho, Y. Takushima, and Y. C. Chung, "Enhanced chromatic dispersion tolerance of 11-Gb/s RSOA-based WDM PON using 4-ary PAM signal," IET Electronics Letters, vol. 46, no. 22, pp. 1510-1512, Oct. 2010.

[127] H. G. Choi, Y. Takushima, and Y. C. Chung, "Phasor monitoring of DxPSK signals using software-based synchronization technique," Optics Express, vol. 18, no. 21, pp. 21511-21518, Oct. 2010.

[126] S. P. Jung, Y. Takushima, and Y. C. Chung, "Transmission of 1.25-Gb/s PSK signal generated by using RSOA in 110-km coherent WDM PON," Optics Express, vol. 18, no. 14, pp. 14871-14877, June 2010.

[125] J. A. Jargon, X. Wu, H. Y. Choi, Y. C. Chung, and A. E. Willner, "Optical performance monitoring of QPSK data channels by use of neural networks trained with parameters derived from asynchronous constellation diagrams ," Optics Express, vol. 18, issue 5, pp. 4931-4938, Mar. 2010

[124] K. Y. Cho, A. Agata, Y. Takushima and Y. C. Chung, "Performance of Forward-Error Correction Code in 10-Gb/s RSOA-Based WDM PON," IEEE Photonics Technology Letter, vol. 22, no. 1, pp. 57-59, Jan. 2010.

[123] H. Y. Choi, Y. Takushima, and Y. C. Chung, "Optical performance monitoring technique using asynchronous amplitude and phase histograms," Optics Express, vol. 17, issue 26, pp. 23953-23958, Dec. 2009.

[122] Y. Takushima, H. Y. Choi, and Y. C. Chung, "Enhanced tolerance to phase distortion due to setting errors in a DxPSK modulator by using data-aided phase noise estimation algorithm," IEEE Photonics Technology Letter, vol. 21, no. 24, pp. 1846-1848, Dec. 2009.

[121] Y. Takushima, H. Y. Choi, and Y. C. Chung, "Wavelength- and polarization-independent operation of differential M-ary PSK receiver based on single delay interferometer using 120-degree optical hybrid," IEEE Photonics Technology Letter, vol. 21, no. 19, pp. 1411-1413, Oct. 2009.

[120] Y. Takushima, H. Y. Choi, Hoon Kim, Y. C. Chung, "Quality monitoring of DxPSK signals by using differential phasor diagram," IEEE Photonics Technology Letter, vol. 21, no. 18, pp. 1305-1307, Sept. 2009.

[119] Y. Takushima, H. Y. Choi, and Y. C. Chung, "Transmission of 108-Gb/s PDM 16ADPSK signal on 25-GHz grid using non-coherent receivers," Optics Express, vol. 17, issue 16, pp. 13458-13466, Aug. 2009.

[118] K. Y. Cho, Y. J. Lee, H. Y. Choi, A. Murakami, A. Agate, Y. Takushima, and Y. C. Chung, "Effects of Reflection in RSOA-Based WDM PON Utilizing Remodulation Technique," IEEE Journal of Lightwave Technology, vol. 27, no. 10, pp. 1286-1295, May 2009.

[117] H. Y. Choi, Paul K. J. Park, and Y. C. Chung, "Chromatic Dispersion Monitoring Technique Using Pilot Tone Carried by Broadband Light Source," IEEE Photonics Technology Letter, vol. 21, no. 9, pp. 578-580, May 2009.

[116] S. J. Park, Y. B. Choi, S. P. Jung, K. Y. Cho, Y. Takushima, and Y. C. Chung, "Hybrid WDM/TDMA-PON Using Self-Homodyne and Differential Coding," IEEE Photonic Technology Letter, vol. 21, no. 7, pp. 465-467, Apr. 2009.

[115] D. H. Sim, Y. Takushima, and Y. C. Chung, "High-speed multimode fiber transmission by using mode-field matched center-launching technique," IEEE Journal of Lightwave Technology, vol. 27, no. 8, pp. 1018-1026, Apr. 2009.

[114] Y. Takushima, H. Y. Choi, and Y. C. Chung, "Measurement of differential phasor diagram of multilevel DPSK signals by using an adjustment-free delay interferometer composed of a 3x3 optical coupler," IEEE Journal of Lightwave Technology, vol. 27, no. 6, pp. 718-730, Mar. 2009.

[113] H. -C. Ji, J. H. Lee, Hoon Kim, Paul K. J. Park, and Y. C. Chung, "Effect of PDL-induced coherent crosstalk on polarization-division-multiplexed direct-detection systems," Optics Express, vol. 17, no. 3, pp. 1169-1177, Feb. 2009.

[112] H. -C. Ji, Hoon Kim, and Y. C. Chung, "Full-duplex radio-over-fiber system using phase-modulated downlink and intensity-modulated uplink," IEEE Photonics Technology Letter, vol. 21, no. 1, pp. 9-11, Jan. 2009.

[111] K. Y. Cho, Y. Takushima, and Y. C. Chung, "Enhanced operating range of WDM PON implemented by using uncooled RSOA's," IEEE Photonics Technology Letters, vol. 20, no. 18, pp. 1536-1538, Sept 2008.

[110] K. Y. Cho, Y. Takushima, and Y. C. Chung, "10-Gb/s operation of RSOA for WDM PON," IEEE Photonics Technology Letters, vol. 20, no. 18, pp. 1533-1535, Sept 2008.

[109] H. Y. Choi, Y. Takushima, and Y. C. Chung, "OSNR monitoring technique for DPSK/DQPSK signals based on self-heterodyne detection," IEEE Photonics Technology Letters, vol. 20, no. 13, pp. 1124-1126, July 2008.

[108] Paul K. J. Park, Jun Haeng Lee, and Y. C. Chung, "Optimization of polarization-scrambling frequency in lightwave systems," Optical Engineering, vol. 47, p. 035005, Mar. 2008.

[107] Paul K. J. Park, C. H. Kim, and Y. C. Chung, "Performance analysis of low-frequency pilot-tonebased monitoring techniques in amplified wavelength-division-multiplexed networks," Optical Engineering, vol. 47, no. 2, pp. 025009, Feb. 2008.

[106] Y. Takushima, S. Y. Shin, and Y. C. Chung, "Design of a LiNbO3 ribbon waveguide for efficient difference-frequency generation of terahertz wave in the collinear configuration," Optics Express, vol. 15, issue 22, pp. 14783-14792, Oct. 2007.

[105] Paul K. J. Park, S. B. Jun, Hoon Kim, D. K. Jung, W. R. Lee, and Y. C. Chung, "Reduction of Polarization-Induced Performance Degradation in WDM PON Utilizing MQW-SLD-Based Broadband Source," Optics Express, vol. 15, issue 21, pp. 14228-14233, Oct. 2007.

[104] Paul K. J. Park and Y. C. Chung, "Analysis of frequency offset in frequency stabilization of semiconductor laser based on frequency dithering technique," Optics Express, vol. 15, issue 21, pp. 14213-14218, Oct. 2007.

[103] H. Y. Choi, S. B. Jun, S. K. Shin, and Y. C. Chung, "Simultaneous monitoring technique for ASE and MPI noises in distributed Raman Amplified Systems," Optics Express, vol. 15, issue 14, pp. 8660-8666, July 2007.

[102] Hoon Kim, S. B. Jun, and Y. C. Chung, "Raman crosstalk suppression in CATV overlay passive optical network," IEEE Photon. Technol. Lett., vol. 19, issue 9, pp. 695-697, May 2007.

[101] S. Y. Kim, S. B. Jun, Y. Takushima, E. S. Son, and Y. C. Chung, "Enhanced performance of RSOA-based WDM PON by using manchester coding," Journal of Optical Networking, vol. 6, issue 6, pp. 624-630, May 2007.

[100] Y. Takushima and Y. C. Chung, "Optical reflectometry based on correlation detection and its application to the in-service monitoring of WDM passive optical network," Optics Express, vol. 15, issue 9, pp. 5318-5326, Apr. 2007.

[99] Paul K. J. Park, S. K. Shin, H. C. Ji, and Y. C. Chung, "Frequency stabilization of multiple semiconductor lasers using digital feedback loop," Optics Communications, vol. 272, issue 1, pp. 217-220, Apr. 2007.

[98] J. Y. Huh, S. B. Jun, J. H. Lee, and Y. C. Chung, "A Novel Four-wave Mixing Compensator," IEEE Photon. Technol. Lett., vol. 19, issue 1, pp. 36-38, Jan. 2007.

[97] J. H. Lee, H. Y. Choi, S. K. Shin, and Y. C. Chung, "A Review of the Polarization-Nulling Technique for Monitoring Optical-Signal-to-Noise Ratio in Dynamic WDM Networks," IEEE Journal of Lightwave Technology, vol. 24, issue 11, pp. 4162-4171, Nov. 2006.

[96] S. B. Jun, Hoon Kim, Paul K. J. Park, J. H. Lee, and Y. C. Chung, "Pilot-tone-based WDM Monitoring Technique for DPSK systems," IEEE Photon. Technol. Lett., vol. 18, issue 20, pp. 2171-2173, Oct. 2006.

[95] Paul K. J. Park, S. B. Jun, and Y. C. Chung, "Chromatic Dispersion Monitoring Technique Based on Chirped Pilot Tones," Optics Communications, vol. 266, issue 1, pp. 280-283, Oct. 2006.

[94] J. Y. Huh, E. S. Son, S. B. Jun, and Y. C. Chung, "Temperature-independent fiber-based optical phase conjugation," IEEE Photon. Technol. Lett., vol. 18, issues 15, pp. 1678-1680, Aug. 2006.

[93] E. S. Son, K. H. Han, J. H. Lee, and Y. C. Chung, "Survivable Network Architectures for Wavelength-Division-Multiplexed Passive Optical Networks," Photonic Network Communications, vol. 12, no. 1, pp. 111-115, July 2006.

[92] J. H. Lee and Y. C. Chung, "Effect of polarization-dependent loss on optical signal-to-noise ratio monitoring technique based on polarization-nulling method," Optics Express, Vol. 14, Issue 12, pp.5045-5049, June 2006.

[91] Paul K. J. Park, Hoon Kim, and Y. C. Chung, "Effects of low cut-off frequency of optical receiver on the performance of lightwave systems using pilot tones," Optics Communications, vol. 261, issues 2, pp.245-248, May 2006.

[90] H. C. Ji, Paul K. J. Park, Hoon Kim, J. H. Lee, and Y. C. Chung, "A novel frequency-offset monitoring technique for direct-detection DPSK systems," IEEE Photon. Technol. Lett., vol. 18, issues 8, pp. 950-952, April 2006.

[89] J. H. Lee, D. M. Yeo, and Y. C. Chung, "Effect of partially polarized amplified spontaneous emission noise on Q-factor estimation using optical signal-to-noise ratio," IEEE Photon. Technol. Lett., vol. 18, issues 3, pp. 463-465, Feb. 2006.

[88] J. H. Lee and Y. C. Chung, "Optimization of monitoring bandwidth for PMD monitoring technique based on RF spectrum analysis," J. Optical Network, vol. 5, pp.97-102, Feb. 2006

[87] K. W. Lim, E. S. Son, K. H. Han, and Y. C. Chung, "Fault localization in WDM passive optical network by reusing downstream light sources," Photonics Technology Letters, IEEE, vol. 17, issues 12, pp. 2691-2693, Dec. 2005.

[86] K. J. Park, H. C. Ji, and Y. C. Chung, "Optical channel monitoring technique using phase-modulated pilot tones," Photonics Technology Letters, IEEE, vol. 17, issues 11, pp. 2481-2483, Nov. 2005.

[85] S. B. Jun, E. S. Son, H. Y. Choi, K. H. Han, and Y. C. Chung, "Effects of MPI Noise on Various Modulation Formats in Distributed Raman Amplified System," Optics Communications, vol. 255, issues 1-3, pp. 41-45, Nov. 2005.

[84] H. S. Chung and Y. C. Chung, "Transmission of 40 Gb/s x 8 WDM channels with 100 GHz spacing using short- period dispersion managed fiber," Optics Communications, vol. 250, issues 4-6, pp. 286-291, June 2005.

[83] S. B. Jun, K. J. Park, Hoon Kim, H. S. Chung, J. H. Lee, and Y. C. Chung, "A novel NRZ to Duobinary Carrier-Suppressed RZ converter using a polarimetric filter," Optics Communications, vol. 249, issues 1-3, pp. 139-143, May 2005.

[82] E. S. Son, J. H. Lee, and Y. C. Chung, "Statistics of Polarization-Dependent Gain in Fiber Raman Amplifiers," IEEE J. of Lightwave Technol., vol. 23, no. 3, pp. 1219-1226, Mar. 2005.

[81] H. S. Chung and Y. C. Chung, "Directly modulated CWDM/DWDM system using negative dispersion fiber for metro network application," Optics Communications, vol. 245, issues 1-6, pp. 171-176, Jan. 2005.

[80] K. J. Park, C. J. Youn, J. H. Lee, and Y. C. Chung, "PMD-Induced Crosstalk in the Presence of Polarization Scrambling," IEEE Photonics Technology Letters, vol. 16, no. 11, pp. 2580-2582, Nov. 2004.

[79] K. H. Han, E. S. Son, H. Y. Choi, K. W. Lim, and Y. C. Chung, "Bidirectional WDM PON using light-emitting diodes spectrum-sliced with cyclic arrayed-waveguide grating," IEEE Photonics Technology Letters, vol. 16, no. 10, pp. 2380-2382, Oct. 2004.

[78] H. C. Ji, J. H. Lee, and Y. C. Chung, "Evaluation on system outage probability due to temperature variation and statistically distributed chromatic dispersion of optical fiber," IEEE J. of Lightwave Technol., vol. 22, no. 8, pp. 1893?1898, Aug. 2004.

[77] H. C. Ji, K. J. Park, J. H. Lee, H. S. Chung, E. S. Son, K. H. Han, S. B. Jun, and Y. C. Chung, "Optical performance monitoring techniques based on pilot tones for WDM network applications," J. Opt. Netw. 3, 510-533 (2004), http://www.osa-jon.org/abstract.cfm?URI=JON-3- 7-510.

[76] C. H. Kim, Y. B. Lee, S. K. Ji, S. D. Choi, S. P. Hamn, M. S. Kim, M. W. Park, S. K. Shin, I. B. Kim, J. H. Lee, H. C. Ji, D. H. Hyun, and Y. C. Chung, "Performance of an OSNR monitor based on the polarization-nulling technique," J. Opt. Netw. 3, 388-395 (2004), http://www.osa-jon.org/abstract.cfm?URI=JON-3-6 -388.

[75] S. B. Jun, K. J. Park, and Y. C. Chung, "Transmission of 2.5-Gb/s WDM channels spaced at 5 GHz over 480 km of single-mode fiber," IEEE Photonics Technology Letters, vol. 15, no. 9, pp. 1309-1311, Sep. 2003.

[74] H. S. Chung, Y. G. Jang, and Y. C. Chung, "Directly modulated 10-Gb/s signal transmission over 320 km of negative dispersion fiber for regional metro network," IEEE Photonics Technology Letters, vol. 15, no. 9, pp. 1306-1308, Sep. 2003.

[73] E. S. Son, K. H. Han, J. K. Kim, and Y. C. Chung, "Bidirectional WDM Passive Optical Network for Simultaneous Transmission of Data and Digital Broadcast Video Service," Journal of Lightwave Tehnology, vol. 21, no. 8, pp. 1723-1727, Aug. 2003.

[72] K. J. Park, C. J. Youn, J. H. Lee, and Y. C. Chung, "Preformance Comparisons of Chromatic Dispersion-Monitoring Techniques Using Pilot Tones," IEEE Photonics Technology Letters, vol. 15, no. 6, pp. 873-875, June 2003.

[71] J. H. Lee, M. S. Kim, and Y. C. Chung, "Statistical PMD Emulator UsingVariable DGD Elements," IEEE Photonics Technology Letters, vol. 15, no. 1, pp. 54-56, Jan. 2003.

[70] Jian Chen, H. Kim, and Y. C. Chung, "Inter-channel interference in multispan WDM transmissions around perfct dispersion- compensated region," Optics Communications vol. 213, lssues 4-6, pp. 367-371, Dec. 2002.

[69] K. J. Park, C. J. Youn, H. Lee, and Y. C. Chung, "Effect of self-phase modulation on group-velocity dispersion measurement technique using PM-AM conversion," Electronics Letters, vol. 38, no. 21, pp. 1247-1248, Oct. 2002.

[68] C. J. Youn, K. J. Park, J. H. Lee, and Y. C. Chung, "OSNR monitoring technique based on orthogonal delayed-homodyne method," IEEE Photonics Technology Letters, vol. 14, no. 10, pp. 1469-1471, Oct. 2002.

[67] K. H. Han, H. Kim, and Y. C. Chung, "Multipurpose fiber-optic access network," Jounal of Optical Network, vol. 1, no. 10, pp. 338-343, Oct. 2002.

[66] J. W. Shin, S. Kim, and Y. C. Chung, "Optical bidirectional add-drop amplifier module with asymmetric fold-back optical path," Electronics Letters, vol. 38, no. 16, pp. 898-900, Aug. 2002.

[65] J. H. Lee, K. Park, C. H. Kim, and Y. C. Chung, "Effects of nonlinear crosstalk in optical pmd compensation," IEEE Photonics Technology Letters, vol. 14, no. 8, pp. 1082-1084, Aug. 2002.

[64] S. Choi, K. Oh, W. Shin, C. S. Park, U. C. Paek, K. J. Park, Y. C. Chung, G. Y. Kim, and Y. G. Lee, "Novel Mode Converter Based on Hollow Optical Fiber for gigabit LAN Communication," IEEE Photonics Technology Letters, vol. 14, no. 2, pp. 248-250, Feb. 2002.

[63] K. J. Park, H. Kim, J. H. Lee, C. J. Youn, S. K. Shin, and Y. C. Chung, "Polarisation-mode dispersion monitoring technique based on polarisation scrambling," Electronics Letters, vol.38, no.2, pp.83-84, Jan.2002.

[62] H. Kim, K. H. Han, and Y. C. Chung, "Performance Iimitation of hybrid WDM systems due to stimulated Raman scattering," IEEE Photonics Technology Letters, vol. 13, no. 10, pp. 1118-11250, Oct. 2001.

[61] C. J. Youn, S. K. Shin, K. J. Park, and Y. C. Chung, "Optical frequency monitoring technique using arrayed waveguide grating and pilot tones," Electronics Letters,vol. 37, no. 16, pp. 1032-1033, Aug. 2001.

[60] J. H. Lee and Y. C. Chung, "Improved OSNR monitoring techbique based on polarization-nulling method," Electronics Letters, vol. 37, no. 15, pp. 972-973, July. 2001.

[59] Chen. J, H. Kim and Y. C. Chung, "Cross-phase modulation in short-period dispersion managed fiber," IEEE Photonics Technology Letters, vol. 13, no. 7, pp. 663-665, July 2001.

[58] H. S. Chung, S. K. Shin, D. W. Lee, D. W. Kim, and Y. C. Chung, "640 Gbit/s [32X20Gbit/s] WDM transmission with 0.4(bit/s)/HZ spectral efficiency using short-period dispersion-managed fiber," Electronics Letters, vol.37, no.10, pp.618-620, May. 2001.

[57] J. K. Kim, H. C. Ji, H. W. Chung, C. H. Kim, S. K. shin, D. H. Hyun, and Y. C. Chung, "Demonstation of fast restorable all-optical WDM network," IEICE Transactions on communications, vol. E84-B, no. 5, pp.1119-1126, May.2001.

[56] D. K. Jung, H. Kim, K. H. Han, and Y. C. Chung, "Spectrum-sliced Bidirectional passive optical network for simultaneous transmission of WDM and digital broadcase video signals," Electronics Letters, vol. 37, no. 5, pp. 308-309, Mar. 2001

[55] H. Kim and Y. C. Chung, "Passive optical network for CDMA-based microcellular communication systems (Invited Paper)," Journal of Lightwave Technology, vol. 19, no. 3, pp. 301-311, Mar. 2001

[54] J. H. Lee, D. K. Jung, C. H. Kim, and Y. C. Chung, "OSNR monitoring technique using polarization-nulling method," IEEE Photonics Technology Letters, vol. 13, no. 1, pp. 88-90, Jan. 2001.

[53] H. S. Chung, H. Kim, S. E. Jin, E. S. Son, D. W. Kim, K. M. Lee, H. Y. Park, and Y. C. Chung, "320-Gb/s WDM transmission with 50-GHz channel spacing over 564 km of short- period," IEEE Photonics Technology Letters, vol. 12, no. 10, pp. 1397-1399, Oct. 2000.

[52] C. H. Kim, H. Yoon, S. B. Lee, C. H. Lee, and Y. C. Chung, "All-optical gain controlled bidirectional add-drop amplifier using fiber Bragg gratings," IEEE Photonics Technology Letters, vol. 12, no. 7, pp. 894-896, Jul. 2000.

[51] H. S. Chung, S. K. Shin, K. J. Park, H. G. Woo, and Y. C. Chung, "Effects of stimulated Raman scattering on pilot-tone based WDM supervisory technique," IEEE Photonics Technology Letters, vol. 12, no. 5, pp. 731-733, May. 2000.

[50] D. K. Jung,S. K. Shin, and Y. C. Chung, "Wavelength tracking technique for spectrum-sliced WDM passive optical network," IEEE Photonics Technology Letters, vol. 12, no. 3, pp. 338-340, Mar. 2000. 

[49] H. Kim and Y. C. Chung, "Bidirectional subcarrier-multiplexed self-healing ring network for CDMA personal communication service," Electronics Letters, vol. 35, no. 25, pp. 2215-2216, Dec. 1999.

[48] H. Kim and Y. C. Chung, "Bidirectional subcarrier-multiplexed transmission system using unisolated optical sources," IEEE Photonics Technology Letters, vol. 11, no. 11, pp.1488-1490, Nov. 1999.

[47] S. K. Shin, C. H. Kim, and Y. C. Chung, "Directly modulated 2.5Gb/s x 16 cgabbek WDM transmission over 640 km of single mode fiber using dispersion compensating fiber," IEEE Photonics Technology Letters, vol. 11, no. 6, pp.742-744, Jun. 1999.

[46] C. H. Kim and Y. C. Chung, "2.5Gb/s x 16 channel bidirectional WDM transmission system using bidirectional erbium-doped fiber amplifier based on spectrally interleaved synchronized etalon filters," IEEE Photonics Technology Letters, vol. 11, no. 6, pp.745-747, Jun. 1999.

[45] Y. S. Jang, C. H. Lee, and Y. C. Chung, "Effects of crosstalks in WDM systems using spectrum-sliced light sources," IEEE Photonics Technology Letters, vol. 11, no. 6, pp. 715-717, Jun. 1999.

[44] K. J. Park, S. K. Shin, and Y. C. Chung, "Simple monitoring technique for WDM networks," Electronics Letters, vol. 35, no. 5, pp. 415-417, Mar. 1999.

[43] H. Kim and Y. C. Chung, "Bi-directional passive optical network for CDMA personal communication service," Electronics Letters, vol. 35, no. 4, pp. 316-318, Feb. 1999.

[42] Jang-Won Park , Y. C. Chung, and Chang-Hee Lee, "Burst-mode optical receiver with two preamplifiers having different bandwidths," Electronics Letters, vol. 34, Dec. 1998.

[41] H. Kim, J. M. Jeong, C. H. Lee, and Y. C. Chung, "Passive optical network for microcellular CDMA personal communication service," IEEE Photonics Technology Letters, vol. 10, no. 11, pp. 1641-1643, Nov. 1998.

[40] H. S. Chung, D. Lee, S. K. Shin, H. Kim, K. S. Cho, and Y. C. Chung, "Demonstration of 37 nm gain bandwidth from 40 cascaded EDFA system using gain equaliser based on all-fibre acousto-optictunable filters," Electronics Letters, vol. 34, no. 21, pp. 2045-2047, Oct. 1998.

[39] D. K. Jung, S. K. Shin, C. H. Lee, and Y. C. Chung, "Wavelength-division-multiplexed passive optical network based on spectrum-slicing technique," IEEE Photonics Technology Letters, vol. 10, no. 9, pp.1334-1336, Sep. 1998.

[38] C. H. Kim, C. H. Lee, and Y. C. Chung, "Bidirectional WDM self-healing ring network based on simple bidirectional add/drop module," IEEE Photonics Technology Letters, vol. 10, no. 9, pp.1340-1342, Sep. 1998

[37] C. H. Kim, C. H. Lee, and Y. C. Chung, "A novel bidirectional add/drop amplifier(BADA)," IEEE Photonics Technology Letters, vol. 10, no. 8, pp.1118-1120, Aug. 1998.

[36] S. K. Shing, H. Kim, C. R. Giles, M. Zirngible, and Y. C. Chung, "A phenomenological model of multifrequency laser," Fiber and Integrated Optics, vol. 17, no. 2, pp.131-138, Apr. 1998.

[35] C. H. Kim, C. R. Giles, and Y. C. Chung, "Two-stage optical limiting fiber amplifier using a synchronize etalon filter," IEEE Photonics Technology Letters, vol. 10, no. 3, pp.. 285-287, Feb. 1998.

[34] Y. S. Jang and Y. C. Chung, "Four-wave mixing of incoherent light in a dispersion-shifted figer using a spectrum-sliced fiber amplifier light source," IEEE Photonics Technology Letters, vol. 10, no. 2, pp. 218-220, Feb. 1998.

[33] J. H. Jang, S. K. Shin, H. Kim, K. S. Lee, K. J. Park, and Y. C. Chung, "A cold-start WDM system using a synchronized etalon filter," IEEE Photonics Technology Letters, vol. 9, no. 3, pp. 383-385, Mar. 1997.

[32] H. Kim, J. H. Jang, and Y. C. Chung, "A novel sliding-frequency quiding filter for soliton transmission," IEEE Photonics Techmology Letters, vol. 8, no. 9, pp. 1193-1195, Sep. 1996.

[31] J. S. Lee and Y. C. Chung, "Spectrum-sliced chammel transmission over 94 km of dispersion-shifted fibre at 1.7Gb/s using a douvle-stage fibre amplifier light source," Optical and Quantum Electronics, vol. 27, pp. 541-546, Mar. 1995.

[30] J. S. Lee, Y. C. Chung, and C. S. Shim, "Bandwidth optimization of a spectrum-sliced amplifier light source using an ahgle-tuned Fabry-Perot filter and a double-stage structure," IEEE Photonics Technology Letters, vol. 6, no. 10, pp. 1197-1199, Oct. 1994.

[29] Y. C. Chung and T. M. Shay, "Frequency offset in frequency-locked semiconductor lasers," Fiber and Integrated Optics, vol. 13, no. 4, pp.357-363, Aug. 1994.

[28] Y. C. Chung, J. S. Lee, R. M. Derosier, and D. J. DiGiovanni, "1.7Gbit/s transmission over 165km of dispersion-shifted fiber using spectrum-sliced fiber amplifier light source," Electronics Letters, vol. 30, no. 17, pp. 1427-1428, Aug. 1994.

[27] J. S. Lee, Y. C. Chung, T. H. Wood, J. P. Meester, C. H. Joyner, C. A. Burrus, J. Stone, H. M. Presby, and D. J. DiGiovanni, "Spectrum-sliced fiber amplifier ligth source with a polarization-insensitive electroabsorption modulator," IEEE Photonics Techmology Letters, vol. 6, no. 8, pp. 1035-1038, Aug. 1994.

[26] Y. C. Chung, J. Jeong, and L. S. Cheng, "Aging-induced wavelength shifts in 1.5um DFB lasers," IEEE Photonics Technology Letters, vol. 6, no. 7, pp. ,792-795, Jul. 1994.

[25] J. S. Lee, Y. C. Chung, and D. J. DiGiovanni, "Spectrum-sliced fiber ampifier light source for multi-channel WDM applications," IEEE Photonics Technology Letters, vol. 5, no. 12, pp. 1458-1461, Dec. 1993.

[24] Y. C. Chung and L. W. Stulz, "Synchronized etalon filters for standardizing WDM transmitter laser wavelengths," IEEE Photonics Technology Letters, vol. 5, no. 2, pp. 186-189, Feb. 1993.

[23] Y. C. Chung, "Temperature-tuned ZnS etalon filters for WDM system," IEEE Photonics Technology Letters, vol. 4, no. 6, pp. 600-602, Jun. 1992.

[22] Y. C. Chung, R. M. Derosier, H. M. Presby, C. A. Burrus, Y. Akai, and N. Masuda, "A 1.5um laser package frequency-locked with a novel miniature discharge lamp," IEEE Photonics Technology Letters, vol. 4, no. 9, pp. 841-844, Sep. 1991.

[21] Y. C. Chung and Y. H. Lee, "Spectral characteristics of vertical-cavity surface-emitting lasers with external optical feedback," IEEE Photonics Technology Letters, vol. 3, no. 7, pp. 597-599, Jul. 1991

[20] Y. C. Chung, J. M. Wiesenfeld, G. Raybon, U. Koren, and Y. Twu, "Intermodulation distortion in a multiple-quantum-well semiconductor optical amplifier," Journal of Current Laser Abstracts, vol. 28, no. 3, pp. 177-, Jul. 1991.

[19] A. J. Lucero, Y. C. Chung, S. Reilly, and R. W. Tkach, "Saturation measurements of excited-state transitions in mnoble gases using the optoglavanic effect," Optics Letters, vol. 16, no. 11, pp. 849-851, Jun. 1991.

[18] A. J. Lucero, Y. C. Chung, and R. W. Tkach, "survey of atomic transitions for absolute frequency locking of lasers for lightwave systems," IEEE Photomics Techmology Letters, vol. 3, no. 5, pp. 484-486, May. 1991.

[17] Y. C. Chung, J. M. Wiesenfeld, G. Raybon, U. Koren, and Y. Twu, "Intermodulation distortion in a multiple-quantum-well semiconductor optical amplifier," IEEE Photonics Technology Letters, vol. 3, no. 2, pp. 130-132, Feb. 1991.

[16] Y. C. Chung and R. M. Derosier, "Frequency-locking of 1.5um InGaAsP lasers to an atomic Krypton line without dithering the laser frequency," IEEE Photonics Technology Letters, vol. 2, no. 6, pp. 435-437, Jun. 1990.

[15] Y. C. Chung and T. M. Shay, "400Hz frequency stability of a GaAlAs laser frequency locked to the Rb(D2)line," Optical Engineering, vol. 29, no. 6, pp. 681-683, Jun. 1990.

[14] Y. C. Chung, "Frequency-locking 1.3 and 1.5um semiconductor lasers for lightwave systems," Journal of Lightwave Technology, vol. 8, no. 6, pp. 869-876, Jun. 1990

[13] Y. C. Chung, L. D. Tzeng, S. Y. Leung, R. W. Tkach, A. R. Chraplyvy, and R. M. Derosier, "A cold-start 1.7Gb/s FSK heterodyne detection system using single-electrode DFB lasers with no equalization," IEEE Photonics Technology Letters, vol. 2, no. 2, pp. 132-134, Feb. 1990.

[12] Y. C. Chung and T. M. Shay, "450Hz relative frequency stability in an AlGaAs diode laser," Progress in Lasers and Electro-Optics, vol. 1, pp. 139-140, Feb. 1990. 

[11] Y. C. Chung, R. W. Tkach, and T. L. Koch, "Novel FSK heterodyne single filter detection system using no IF frequency," IEEE Photonics Technology Letters, vol. 1, no. 6, pp. 140-141, Jun. 1989.

[10] Y. C. Chung, "Frequency-locked of a 1.3um DFB laser using a miniature Argon glow lamp," IEEE Photonics Technology Letters, vol. 1, no. 6, pp. 135-136, Jun. 1989.

[9] Y. C. Chung and T. M. Shay, "A simple technique for measuring the injection current induced frequency deviation of semiconductor lasers," Applied Optics, vol. 28, no. 16, pp. 648-649, Feb. 1989.

[8] Y. C. Chung, K. Pollock, P. Fitzgerald, B. Glance, and R. W. Tkach, "WDM coherent lstarnetwork with an absolute frequency reference," Electronics Letters, vol. 24, no. 21, pp. 1313-1314, Oct. 1988.

[7] Y. C. Chung and C. B. Roxlo, "Frequency-locking of 1.5um DFB laser to an atomic krypton line using the optogalvanic effect," Electronics Letters, vol. 24, no. 16, pp. 1048-1049, Aug. 1988.

[6] T. M. Shay and Y. C. Chung, "Ultrahigh-resolution, wide-field-of-view optical filter for the detection of frequency- doubled Nd;YAG radiation," Optics Letters, vol. 13, no. 6, pp. 443-445, Jun. 1988.

[5] Y. C. Chung, R. W. Tkach, A. R. Chraplyvy, and C. B. Roxol, "Performance of a frequency-locked 1.3um DFB laser under 50Mbits/s FSK modulation," Electronics Letters, vol. 24, no. 18, pp. 1159-1160, Jun. 1988

[4] Y. C. Chung and R. W. Tkach, "Frequency stabilization of 1.3um DFB laser to an argon line using the optogalvanic effect," Electronics Letters, vol. 24, no. 13, pp. 804-805, Jun. 1988.

[3] Y. C. Chung and T. M. Shay, "Frequency stabilization of a diode laser to a Fabry-Perot interferometer," Optical Engineering, vol. 27, no. 5, pp. 424-427, May. 1988.

[2] Y. C. Chung and T. M. Shay, "Experimental demonstration of a diode laser-excited optical filter in atomic Rb vapor," IEEE Journal of Quantum Electronics, Vol. 24, No. 5, pp. 709-711, May. 1988.

[1] Y. C. Chung and T. M. Shay, "450Hz relative frequency stability in an AlGaAs diode laser," Electronics Letters, vol. 23, no. 20, 99. 1044-1045, Sep. 1987