A Polarization Multiplexed Carrier based Coherent Link with Adaptive Polarization Control

Transmitting polarization multiplexed carrier makes the receiver of a coherent system local oscillator-less and frequency offset-free. A polarization multiplexed carrier based self-homodyne (PMC-SH) system with an adaptive polarization control (PC) can replace pulse amplitude modulation (PAM- 4) data center interconnects. An adaptive PC technique is practically implemented by using an electrically controlled PC along-with control circuitry for PMC-SH systems. The de-multiplexing of the carrier and the modulated signal by using this technique is validated through simulations for a 50 Gbaud PMC-SH quadrature phase shift keying (QPSK) system with 20km standard single mode fiber (SSMF). We successfully demonstrate 16 Gbaud PMC-SH systems with adaptive PC for 10km SSMF channel. A bit error rate (BER) of 5.9 x 10^(-5) is achieved with 32 Gb/s PMC-SHQPSK system without any signal processing while a BER of 8.7 x 10^(-3) is achieved with a 64 Gb/s PMC-SH quadrature amplitude modulation (16QAM) system after equalization.

[1]  Radhakrishnan Nagarajan,et al.  Demonstration and performance analysis of 4 Tb/s DWDM metro-DCI system with 100G PAM4 QSFP28 modules , 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).

[2]  P. Andrekson,et al.  Cancellation of SPM in self-homodyne coherent systems , 2009, 2009 35th European Conference on Optical Communication.

[3]  M. Hanawa,et al.  All-Optical Generation of Optical BPSK/QPSK Signals Interleaved With Reference Light , 2012, IEEE Photonics Technology Letters.

[4]  Xiangtao Li,et al.  Coherent Analog Low Power, Small Size 400/200/100Gb/s Receiver Based on Bipolar SiGe Technology , 2018, 2018 Optical Fiber Communications Conference and Exposition (OFC).

[5]  Arvind Kumar Mishra,et al.  First demonstration of an all analog adaptive equalizer for coherent DP-QPSK links , 2017, 2017 Optical Fiber Communications Conference and Exhibition (OFC).

[6]  Miyazaki Tetsuya,et al.  40-Gb/s QPSK with inserted pilot symbols using self-homodyne detection , 2008 .

[8]  T. Miyazaki,et al.  Linewidth-tolerant QPSK homodyne transmission using a polarization-multiplexed pilot carrier , 2006, IEEE Photonics Technology Letters.