Abstract

Coherent detection is advantageous in achieving high electrical spectral efficiency (ESE) relative to direct detection (DD), due to its capability of field recovery. However, the stringent requirement on the laser sources prevents it from being widely utilized in cost-sensitive short-reach applications. Carrier-assisted differential detection (CADD) was proposed to retrieve the optical field without needing for a narrow-linewidth local oscillator (LO) in a receiver. To realize a compact CADD receiver, silicon photonic (SiP) integration is therefore of particular interest since it leverages the standard complementary metal-oxide semiconductor (CMOS) compatible fabrication, offering high yield, low cost, and compact footprint. The fabrication process does not introduce III-V materials as the CADD receiver is LO-free. In this article, we fabricated a SiP integrated CADD receiver and demonstrated the transmission and reception of a 240-Gb/s orthogonal frequency division multiplexing (OFDM) 16-ary quadrature amplitude modulation (16-QAM) signal transmitted over an 80-km single-mode fiber (SMF) link, with a bit error ratio (BER) below the 25% overhead (OH) soft-decision forward error correction (SD-FEC) threshold. To the best of our knowledge, we achieve a record 5.2-b/s/Hz ESE per polarization for an integrated DD receiver.

Modified SiP single-polarization CADD receiver

Jingchi Li, Zhen Wang, Xingfeng Li, William Shieh, and Yikai Su
Opt. Lett. 49(5) 1133-1136 (2024)

Carrier-assisted differential detection with reduced guard band and high electrical spectral efficiency

Jingchi Li, Shaohua An, Honglin Ji, Xingfeng Li, William Shieh, and Yikai Su
Opt. Express 29(21) 33502-33511 (2021)

Symmetric carrier assisted differential detection receiver with low-complexity signal-signal beating interference mitigation

Yixiao Zhu, Longsheng Li, Yan Fu, and Weisheng Hu
Opt. Express 28(13) 19008-19022 (2020)

Offset double sideband carrier assisted differential detection with field recovery at low carrier-to-signal power ratio

Peng Qin, Chenglin Bai, Zhiguo Wang, Hengying Xu, Lishan Yang, YiNing Zhang, Peiyun Ge, and Xueyuan Luo
Opt. Express 30(26) 48112-48132 (2022)

Carrier assisted differential detection with a generalized transfer function

Honglin Ji, Miao Sun, Chuanbowen Sun, and William Shieh
Opt. Express 28(24) 35946-35959 (2020)