Chinese Optics Letters, Volume. 20, Issue 9, 090601(2022)

Spectrally sliced heterodyne coherent receiver with halved electrical bandwidth

Qi Wu, Yixiao Zhu*, Ziyu Cheng, Longjie Yin, and Weisheng Hu**
Author Affiliations
  • State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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    A spectrally sliced heterodyne coherent receiver (SHCR) employing four balanced photodetectors and analog-to-digital converters with half of the signal bandwidth is proposed to complete the signal reception and field recovery. We first numerically characterize the performance of SHCR compared with an intradyne coherent receiver and then validate the principle of the SHCR in a proof-of-concept single-polarization experiment. A 60 GBaud 16-quadrature amplitude modulation transmission is experimentally demonstrated over 80 km standard single-mode fiber with a bit-error-rate of 8.5×10-4 below the 7% hard-decision forward error correction threshold of 3.8×10-3. The SHCR offers a low-cost, hybrid-free, and channel-skew-tolerant candidate for data center interconnects.

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    1. Introduction

    Since 2005, digital coherent receivers have brought optical communication into a new era[1]. Optical coherent detection enables full-field recovery of dual-polarization in-phase and quadrature (IQ) modulated signal, quadrupling the transmission spectral efficiency compared with intensity-modulation direct detection (IMDD) solutions. Optical field impairments such as chromatic dispersion (CD) and polarization mode dispersion (PMD) can be also compensated by digital signal processing (DSP) at the receiver[2]. According to the frequency offset between the local oscillator (LO) and the signal, coherent receivers are divided into two categories: heterodyne coherent receiver (HCR) and intradyne coherent receiver (ICR). Intradyne detection has been investigated extensively in optical communication systems[35] because it relaxes the requirement for the bandwidth of analog-to-digital converters (ADCs).

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    Qi Wu, Yixiao Zhu, Ziyu Cheng, Longjie Yin, Weisheng Hu. Spectrally sliced heterodyne coherent receiver with halved electrical bandwidth[J]. Chinese Optics Letters, 2022, 20(9): 090601

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Feb. 15, 2022

    Accepted: May. 13, 2022

    Published Online: Jun. 16, 2022

    The Author Email: Yixiao Zhu (yixiaozhu@sjtu.edu.cn), Weisheng Hu (wshu@sjtu.edu.cn)

    DOI:10.3788/COL202220.090601

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