To achieve an ultra-compact and flexible coherent transceiver solution, a carrier-less coherent detection technique using a two-dimensional (2-D) photodetector array (PDA) is proposed based on the idea of phase retrieval (PR). In the proposed PR-based coherent receiver, the optical phase information is digitally reconstructed from multiple intensity-only measurements acquired by arrayed photodetectors; neither local light sources, optical hybrids, nor spatial demultiplexers are needed. We develop a robust and low-complexity PR algorithm, which exploits prior knowledge on the optical modulation format, for the proposed PR receiver. As a proof-of-concept, the coherent detection of 10-Gbaud optical phase-modulated signals, including QPSK, 16-QAM, coherent optical OFDM, and polarization-multiplexed QPSK signals, using only a 2-D PDA is demonstrated experimentally.

中文翻译：

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一种基于二维光电探测器阵列的相位恢复相干接收机

为了实现超紧凑和灵活的相干收发器解决方案，基于相位检索 (PR) 的思想，提出了一种使用二维 (2-D) 光电探测器阵列 (PDA) 的无载波相干检测技术。在提出的基于 PR 的相干接收器中，光相位信息是从阵列光电探测器获得的多个仅强度测量值中数字化重建的；既不需要本地光源、光混合器，也不需要空间解复用器。我们开发了一种鲁棒且低复杂度的 PR 算法，该算法利用关于光调制格式的先验知识，用于所提出的 PR 接收器。作为概念验证，10-Gbaud 光相位调制信号的相干检测，包括 QPSK、16-QAM、相干光 OFDM 和偏振复用 QPSK 信号，