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Academic Staff

LAU Pak-tao Alan

BASc, MASc, PhD.

Room: CF610
Personal webpage :



Dr. Alan Pak Tao Lau obtained the B.A.Sc. in Engineering Science (Electrical Option) and M.A.Sc. in Electrical and Computer Engineering from the University of Toronto in 2003 and 2004 respectively. He worked on source coding techniques for wireless communication systems utilizing multiuser diversity for his masters’ thesis research. He then obtained the Ph.D. degree in Electrical Engineering at Stanford University in 2008. He is the recipient of numerous government awards during his post-graduate study at Stanford University. He also worked at NEC Labs America in 2006 as a research associate in the Optical Networking Division. His current research interests include system designs and signal processing techniques for coherent fiber-optic communication systems and multi-mode fiber communication systems. He joined the Electrical Engineering Department at the Hong Kong Polytechnic University as an Assistant Professor in Fall 2008.

He is a member of IEEE and OSA and serves as a reviewer for numerous journals including OSA Optics Express, IEEE Transactions on Wireless Communications and Transactions on Communications.

Dr. Lau is currently looking for M.Phil., Ph.D. students as well as post-doctoral researchers to perform research in fiber-optic communications and related disciplines. Interested individuals who possess a background in photonics, fiber-optic communications, signal processing and even wireless communications are welcomed to contact Dr. Lau for further information.

Refereed Journals

2016 - 2017

1. GUI,Tao#, CHAN,Terence H., LU,C., LAU,A.P.T. and WAI,P.K.A., "Alternative Decoding Methods for Optical Communications Based on Nonlinear Fourier Transform". Journal of Lightwave Technology, Vol. 35, No. 9, pp.1542-1550 (May 2017) ISSN 0733-8724(print), 1558-2213(electronic)


2. ZHONG,Kangping, ZHOU,Xian, WANG,Yiguang, WANG,Yin, ZHOU,Wenjun, CHEN,Wei, ZENG,Li, WANG,Liang, LAU,A.P.T. and LU,C., "Transmission of a 120-GBd PM-NRZ Signal Using a Monolithic Double-Side EML". IEEE Photonics Technology Letters, Vol. 28, No. 20, pp.2176-2179 (Oct 2016) ISSN 1041-1135(print), 1941-0174(electronic)


3. ZHONG,Kangping, ZHOU,Xian, WANG,Yiguang, WANG,Liang, YUAN,Jinhui, YU,Changyuan, LAU,A.P.T. and LU,C., "Experimental demonstration of 608Gbit/s short reach transmission employing half-cycle 16QAM Nyquist-SCM signal and direct detection with 25Gbps EML". Optics Express, Vol. 24, No. 22, pp.25057 (Oct 2016) ISSN 1094-4087(electronic)


4. KHAN,Faisal Nadeem, ZHONG,Kangping, AL-ARASHI,Waled Hussein, YU,Changyuan, LU,C. and LAU,A.P.T., "Modulation Format Identification in Coherent Receivers Using Deep Machine Learning". IEEE Photonics Technology Letters, Vol. 28, No. 17, pp.1886-1889 (Sep 2016) ISSN 1041-1135(print), 1941-0174(electronic) 


5. WANG,Yiguang, ZHOU,Yingjun, GUI,Tao#, ZHONG,Kangping, ZHOU,Xian, WANG,Liang, LAU,A.P.T., LU,C. and CHI,Nan, "Efficient MMSE-SQRD-Based MIMO Decoder for SEFDM-Based 2.4-Gb/s-Spectrum-Compressed WDM VLC System". IEEE Photonics Journal, Vol. 8, No. 4, pp.1-9 (Aug 2016) ISSN 1943-0655(electronic)


6. KHAN,Faisal Nadeem, LU,C. and LAU,A.P.T., "Joint modulation format/bit-rate classification and signal-to-noise ratio estimation in multipath fading channels using deep machine learning". Electronics Letters, Vol. 52, No. 14, pp.1272-1274 (Jul 2016) ISSN 0013-5194(print), 1350-911X(electronic)


7. ZHOU,Xian, ZHONG,Kangping, HUO,Jiahao, GAO,Lei, WANG,Yiguang, WANG,Liang, YANG,Yanfu, YUAN,Jinhui, LONG,Keping, ZENG,Li, LAU,A.P.T. and LU,C., "112 Gb/s transmission over 80 km SSMF using PDM-PAM4 and coherent detection without optical amplifier". Optics Express, Vol. 24, No. 15, pp.17359 (Jul 2016) ISSN 1094-4087(electronic)


1. ZHOU,Huibin, LI,Borui, TANG,Ming, ZHONG,Kangping, FENG,Zhenhua, CHENG,Jingchi, LAU,A.P.T., LU,C., FU,Songnian, SHUM,Perry Ping and LIU,Deming, "Fractional Fourier Transformation-Based Blind Chromatic Dispersion Estimation for Coherent Optical Communications". Journal of Lightwave Technology, Vol. 34, No. 10, pp.2371-2380 (May 2016) ISSN 0733-8724(print), 1558-2213(electronic)

2. DONG,Zhenhua#, KHAN,Faisal Nadeem, SUI,Qi#, ZHONG,Kangping, LU,C. and LAU,A.P.T., "Optical Performance Monitoring: A Review of Current and Future Technologies". Journal of Lightwave Technology, Vol. 34, No. 2, pp.525-543 (Jan 2016) ISSN 0733-8724(print), 1558-2213(electronic)

3. ZHOU,Xian, ZHONG,Kangping, HUO,Jiahao, YUAN,Jinhui, LI,F., WANG,Liang, LONG,Keping, LAU,A.P.T. and LU,C., "Polarization-Multiplexed DMT With IM-DD Using 2 × 2 MIMO Processing Based on SOP Estimation and MPBI Elimination". IEEE Photonics Journal, Vol. 7, No. 6, pp.1-12 (Dec 2015) ISSN 1943-0655(print), 1943-0655(electronic)

4. KHAN,Faisal Nadeem, YU,Yi, TAN,Ming Chieng, AL-ARASHI,Waled Hussein, YU,Changyuan, LAU,A.P.T. and LU,C., "Experimental demonstration of joint OSNR monitoring and modulation format identification using asynchronous single channel sampling". Optics Express, Vol. 23, No. 23, pp.30337-30346 (Nov 2015) ISSN 1094-4087(print), 1094-4087(electronic)

5. KHAN,Faisal Nadeem, TEOW,Chiew Hoon, KIU,Shiu Guong, TAN,Ming Chieng, ZHOU,Yudi, AL-ARASHI,Waled Hussein, LAU,A.P.T. and LU,C., "Automatic modulation format/bit-rate classification and signal-to-noise ratio estimation using asynchronous delay-tap sampling". Computers & Electrical Engineering, Vol. 47, pp.126-133 (Oct 2015) ISSN 00457906(print)

6. BILAL,Syed Muhammad, BOSCO,Gabriella, DONG,Zhenhua#, LAU,A.P.T. and LU,C., "Blind modulation format identification for digital coherent receivers". Optics Express, Vol. 23, No. 20, pp.26769-26778 (Oct 2015) ISSN 1094-4087(print), 1094-4087(electronic)

7. ZHONG,Kangping, ZHOU,Xian, GAO,Yuliang#, CHEN,Wei, MAN,Jiangwei, ZENG,Li, LAU,A.P.T. and LU,C., "140-Gb/s 20-km Transmission of PAM-4 Signal at 1.3 $\mu \text{m}$ for Short Reach Communications". IEEE Photonics Technology Letters, Vol. 27, No. 16, pp.1757-1760 (Aug 2015) ISSN 1041-1135(print), 1941-0174(electronic)

8. DONG,Zhenhua#, HARI,Siddarth, GUI,Tao#, ZHONG,Kangping, YOUSEFI,Mansoor Isvand, LU,C., WAI,P.K.A., KSCHISCHANG,Frank R. and LAU,A.P.T., "Nonlinear Frequency Division Multiplexed Transmissions Based on NFT". IEEE Photonics Technology Letters, Vol. 27, No. 15, pp.1621-1623 (Aug 2015) ISSN 1041-1135(print), 1941-0174(electronic)

9. YANG,Yanfu, CAO,Guoliang, ZHONG,Kangping, ZHOU,Xian, YAO,Yong, LAU,A.P.T. and LU,C., "Fast polarization-state tracking scheme based on radius-directed linear Kalman filter". Optics Express, Vol. 23, No. 15, pp.19673-19680 (Jul 2015) ISSN 1094-4087(print), 1094-4087(electronic)


1. Tan,Ming Chieng, KHAN,F.N., Al-Arashi,Waled Hussein, Zhou,Yudi and LAU,A.P.T., "Simultaneous Optical Performance Monitoring and Modulation Format/Bit-Rate Identification Using Principal Component Analysis". Journal of Optical Communications and Networking, Vol. 6, No. 5, pp.441-448 (May 2014) ISSN 1943-0620(print), 1943-0639(electronic)

2. LAU,A.P.T., Gao,Yuliang#, Sui,Qi#, WANG,D., Zhuge,Qunbi, Morsy-Osman,Mohamed H., Chagnon,Mathieu, Xu,Xian, LU,C. and Plant,David V., "Advanced DSP Techniques Enabling High Spectral Efficiency and Flexible Transmissions: Toward elastic optical networks". IEEE Signal Processing Magazine, Vol. 31, No. 2, pp.82-92 (Mar 2014) ISSN 1053-5888(print)

3. Huang,Lingchen, WANG,D., LAU,A.P.T., LU,C. and He,Sailing, "Performance analysis of blind timing phase estimators for digital coherent receivers". Optics Express, Vol. 22, No. 6, pp.6749-6763 (Mar 2014) ISSN 1094-4087(electronic)

4. KHAN,F.N., Zhou,Yudi, Sui,Qi# and LAU,A.P.T., "Non-data-aided joint bit-rate and modulation format identification for next-generation heterogeneous optical networks". Optical Fiber Technology, Vol. 20, No. 2, pp.68-74 (Mar 2014) ISSN 10685200(print)

5. Tao,Li, Wang,Yiguang, Gao,Yuliang#, LAU,A.P.T., Chi,Nan and LU,C., "40 Gb/s CAP32 System With DD-LMS Equalizer for Short Reach Optical Transmissions". IEEE Photonics Technology Letters, Vol. 25, No. 23, pp.2346-2349 (Dec 2013) ISSN 1041-1135(print), 1941-0174(electronic)

6. Tao,Li, Ji,Yu, Liu,Jie, LAU,A.P.T., Chi,Nan and LU,C., "Advanced modulation formats for short reach optical communication systems". IEEE Network, Vol. 27, No. 6, pp.6-13 (Nov 2013) ISSN 0890-8044(print)


1. GAO, Y., LAU, A.P.T. and LU, C., " Modulation-Format-Independent Carrier Phase Estimation for Square M-QAM Systems ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 25, No. 11, pp.1073-1076 (June 2013)

2. WANG, D., LU, C., LAU, A.P.T., WAI, P.K.A. and HE, S., " Adaptive CD Estimation for Coherent Optical Receivers Based on Timing Error Detection ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 25, No. 10, pp.985-989 (May 2013)

3. TAO, L., WANG, Y., GAO, Y., LAU, A.P.T., CHI, N. and LU, C., " Experimental demonstration of 10 Gb/s multilevel carrier-less amplitude and phase modulation for short range optical communication systems ". OPTICS EXPRESS, Vol. 21, No. 5, pp.6459-6465 (Mar 2013)

4. SUI, Q.#, LAU, A.P.T. and LU, C., " Fast and Robust Blind Chromatic Dispersion Estimation Using Auto-Correlation of Signal Power Waveform for Digital Coherent Systems ". JOURNAL OF LIGHTWAVE TECHNOLOGY, Vol. 31, No. 2, pp.306-312 (Jan 2013)

5. YAN, S., WENG, X., GAO, Y., LU, C., LAU, A.P.T., JI, Y., LIU, L. and XU, X., " Generation of square or hexagonal 16-QAM signals using a Dual-drive IQ modulator ". OPTICS EXPRESS, Vol. 20, No. 27, pp.29023-29034 (Dec 2012)

6. DONG, T., BAO, Y., JI, Y., LAU, A.P.T., LI, Z. and LU, C., " Bidirectional hybrid OFDM-WDM-PON system for 40 Gb/s downlink and 10 Gb/s uplink transmission using RSOA re-modulation ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 24, No. 22, pp.2024-2026 (Nov 2012)

7. KHAN, F.N., LAU, A.P.T., LU, C., ANDERSON, T.B., LI, J.C. and WAI, P.K.A., " Simultaneous and independent OSNR and chromatic dispersion monitoring using empirical moments of asynchronously sampled signal amplitudes ". IEEE Photonics Journal, Vol. 4, No. 5, pp.1340-1350 (Oct 2012)

8. SHEN, T.S.R.#, SUI, Q.# and LAU, A.P.T., " OSNR Monitoring for PM-QPSK systems with Large Inline Chromatic Dispersion Using Artificial Neural Network Technique ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 24, No. 17, pp.1564-1567 (Sept 2012)

9. DONG, Z., LAU, A.P.T. and LU, C., " OSNR Monitoring for QPSK and 16-QAM Systems in Presence of Fiber Nonlinearities for Digital Coherent Receivers ". OPTICS EXPRESS, Vol. 20, No. 17, pp.19520-19534 (Aug 2012)

10. WU, C., LIU, Z., CHUNG, K.M., TSE, M.L.V., CHAN, F.Y.M., LAU, A.P.T., LU, C. and TAM, H.Y., " Strong LP01 and LP11 Mutual Coupling Conversion in a Two-Mode Fiber Bragg Grating ". IEEE Photonics Journal, Vol. 4, pp.1080-6 (August 2012)


1. WU, C, LIU, Z.Y.#, CHUNG, K.M.#, TSE, M.L.V., CHAN, F.Y.M., LAU, A.P.T., LU, C and TAM, H.Y., " Strong LP01 and LP11 mutual coupling conversion in a two-mode fiber Bragg grating ". IEEE Photonics Journal, Vol. 4, No. 4, pp.1080-1086 (2012 May)

2. KHAN, F.N., ZHOU, Y.D.#, LAU, A.P.T. and LU, C., " Modulation Format Identification in Heterogeneous Fiber-Optic Networks using Artificial Neural Networks ". OPTICS EXPRESS, Vol. 20, No. 11, pp.12422-31 (May 2012)

3. KHAN, F.N., SHEN, T.S.R.#, ZHOU, Y.D.#, LAU, A.P.T. and LU, C., " Optical Performance Monitoring Using Artificial Neural Networks Trained with Empirical Moments of Asynchronously Sampled Signal Amplitudes ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 24, No. 12, pp.982-4 (June 2012)

4. CHAN, F.Y.M., LAU, A.P.T and TAM, H.Y., " Mode coupling dynamics and communication strategies for multi-core fiber systems ". OPTICS EXPRESS, Vol. 20, No. 4, pp.4548-4563 (2012 Feb)

5. BAI, N., IP, E., HUANG, Y.K., MATEO, E., YAMAN, F., LI, M.J., BICKHAM, S., TEN, S., LINARES, J., MONTERO, C., MORENO, V., PRIETO, X., TSE, V., CHUNG, K.M., LAU, A.P.T., TAM, H.Y., LU, C., LUO, Y., PENG, G.D., LI, G. and WANG, T., " Mode-Division Multiplexed Transmission with Inline Few-Mode Fiber Amplifier ". OPTICS EXPRESS, Vol. 20, No. 3, pp.2668-80 (January 2012)

6. YANG, Y.F., LU, C., LAU, A.P.T., YAO, Y., SUN, Y.X., XIAO, J.J., TAM, H.Y. and WAI, P.K.A., " A Robust and Dither-Free Technique for Controlling Driver Signal Amplitude for Stable and Arbitrary Optical Phase Modulation ". OPTICS EXPRESS, Vol. 19, No. 27, pp.26353-8 (December 2011)

7. YANG, J., YU, C., YANG, Y.F., CHENG, L.H., LI, Z.H., LU, C., LAU, A.P.T., TAM, H.Y. and WAI, P.K.A., " PMD-Insensitive CD Monitoring Based on RF Clock Power Ratio Measurement with Optical Notch Filter ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 23, No. 21, pp.1576-8 (November 2011)

8. GAO, Y., LAU, A.P.T., YAN, S. and LU, C., " Low-Complexity and Phase Noise Tolerant Carrier Phase Estimation for Dual-Polarization 16-QAM Systems ". OPTICS EXPRESS, Vol. 19, No. 22, pp.21717-29 (October 2011)

9. LI, Q., LI, F., WONG, K.K.Y., LAU, A.P.T., TSIA, K.K. and WAI, P.K.A., " Investigating the Influence of a Weak Continuous-Wave-Trigger on Picosecond Supercontinuum Generation ". OPTICS EXPRESS, Vol. 19, No. 15, pp.13757-69 (July 2011)

10. WANG, D., LU, C., LAU, A.P.T. and HE, S.L., " Adaptive Chromatic Dispersion Compensation for Coherent Communication Systems Using Delay-Tap Sampling Technique ". IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 23, No. 14, pp.1016-8 (July 2011)

Invited Conference Papers


1. SUI,Qi#, ZHANG,Hongyu, Downie,John D., Wood,William A., Hurley,Jason E., Mishra,Snigdharaj, LAU,A.P.T., LU,C., TAM,H.Y. and WAI,P.K.A., "256 Gb/s PM-16-QAM Quasi-Single-Mode Transmission over 2600 km using Few-Mode Fiber with Multi-Path Interference Compensation". Optical Fiber Communication Conference, San Francisco, California, 9-13 March 2014, OSA, Washington, D.C. (Mar 2014) ISBN 978-1-55752-993-0(print) ( (paper M3C.5)


1. LU, C., LAU, A.P.T., SUI, Q., KHAN, F.N. and DONG, Z., " Optical Performance Monitoring: from Direct Detection to Coherent Optical Communication Systems ". Asia Communications and Photonics Conference (ACP'2012), Guangzhou, China, 7-10 November 2012 (2012) (Invited Paper, USB Version)

2. LU, C., YAN, S., LAU, A.P.T., GAO, Y. and SUI, Q., " High Order Modulation Formats for Multi-Terabit Optical Communication Systems ". Proceedings, International Photonics and OptoElectronics Meetings (POEM'2012), Wuhan, China, 1-2 November 2012, pp.IF3A.1 (2012)


1. LAU, A.P.T., HAUSKE, F.N., ANDERSON, T.B. and LU, C., " Performance Monitoring Through Signal Processing in Current and Future Optical Communication Systems ". Proceedings, OSA Signal Processing in Photonic Communications (SPPCom'2012), Colorado Springs, U.S.A., June, pp.SpTh2B.1 (2012)

2. LAU, A.P.T., SUI, Q.#, SHEN, T.S.R.#, KHAN, F.N. and LU, C., " Optical Performance Monitoring for Next Generaton Optical Networks: Progress and Challenges ". International Conference on Advanced Infocomm. Technology (ICAIT'2011), Wuhan, China, July (2011) (CD Version)

3. LU, C., LAU, A.P.T., SUI, Q.# and KHAN, F.N., " Optical Performance Monitoring Techniques for Next Generation Optical Networks ". 16th European Conference on Networks and Optical Communications (NOC'2011), Newcastle upon Tyne, U.K., July (2011) (CD Version)

Honours and Awards

Patents granted

2017 - 2018

1. 刘,洁, 罗,雅枝, 刘,伯涛, 吕,超 and 卢,彦兆, "一种识别正交调制信号的调制格式的方法及装置". PRC - ZL201380001432.8 (Mar 2018) (Co-owned with Huawei Technologies Co. Ltd.)