Abstract

A novel iterative algorithm for electronic dispersion compensation (EDC) at the transmitter is described and demonstrated for intensity modulation and direct detection (IM/DD) systems. The proposed algorithm is based on the Gerchberg-Saxton (GS) algorithm, where the link dispersion performs time-to-frequency mapping, while the unconstrained phase at the direct detection receiver acts as a degree of freedom. Simulation results for a transmitter employing a single drive Mach-Zehnder modulator (MZM) operating at 28 Gb/s non-return-to-zero on-off keying (NRZ-OOK), show pre-compensation of upto 100 km of single mode fiber (SMF), with 1 dBQ margin above the forward error correction (FEC) bit error rate (BER) limit of $3.8 \times 10^{-3}$ . It is shown that with five iterations of the proposed EDC algorithm in digital-signal processing (DSP) coupled with an 8-bit 56 GSa/s digital-to-analog converter (DAC), the transmission reach is extended by a factor of 5 in unamplified SMF links. Simulations for a 56 Gb/s four-level pulse-amplitude-modulation (PAM-4) show the compensation of upto 10 km with five iterations of the EDC algorithm at 1 dBQ above the FEC limit.

Experimental demonstration of pre-electronic dispersion compensation in IM/DD systems using an iterative algorithm

Xiong Wu, Abdullah S. Karar, Kangping Zhong, Alan Pak Tao Lau, and Chao Lu
Opt. Express 29(16) 24735-24749 (2021)

Low-complexity clustered polynomial nonlinear filter-based electrical dispersion pre-compensation scheme in IM/DD transmission systems

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Multi-constraint Gerchberg-Saxton iteration algorithms for linearizing IM/DD transmission systems

Shaohua Hu, Jing Zhang, Jianming Tang, Taowei Jin, Wei Jin, Qun Liu, Zhuqiang Zhong, Roger Giddings, Yanhua Hong, Bo Xu, Xingwen Yi, and Kun Qiu
Opt. Express 30(6) 10019-10031 (2022)

Transmission of a 56 Gbit/s PAM4 signal with low-resolution DAC and pre-equalization only over 80 km fiber in C-band IM/DD systems for optical interconnects

Mingzhu Yin, Dongdong Zou, Wei Wang, Fan Li, and Zhaohui Li
Opt. Lett. 46(22) 5615-5618 (2021)

Receive-diversity-aided power-fading compensation for C-band IM/DD OFDM systems

Junwei Zhang, Heyun Tan, Liwang Lu, Lin Sun, Xiong Wu, Alan Pak Tao Lau, and Chao Lu
Opt. Lett. 48(9) 2237-2240 (2023)