Photonic Integrated Self-Coherent Homodyne Receiver Without Optical Polarization Control for Polarization-Multiplexing Short-Reach Optical Interconnects

Ji, Honglin; Wang, Zhen; Li, Xingfeng; Li, Jingchi; Unnithan, Ranjith Rajasekharan; Su, Yikai; Shieh, William

doi:10.1109/jlt.2022.3213524

Cited by 6 publications

(1 citation statement)

References 27 publications

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“…Silicon-integrated optical switches, which benefit from CMOS compatibility and mature fabrication compared with their electronic counterparts, have attracted widespread interest. Optical interconnects [6][7][8] are being discussed as a replacement for conventional electrical interconnects and are expected to be applied for future generations of HPC and DC.…”

Section: Introductionmentioning

confidence: 99%

Making Path Selection Bright: A Routing Algorithm for On-Chip Benes Networks

Zhao,

Li,

2024

Electronics

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Optical interconnects are being discussed as a replacement for conventional electrical interconnects and are expected to be applied for future generations of high-performance supercomputers and data centers. Benes networks have attracted much attention because they require only 2 × 2 optical switches, which reduce the cost of rearrangeable nonblocking. However, optical power imbalances can significantly challenge receiver sensitivity. In this work, insertion loss (IL) fairness has been proposed and applied to the field of switches to achieve a relative balance of optical path data transmission in Benes networks. Fairness can be achieved when the port count is small (4 × 4) if the IL between ports is balanced. When the number of ports is moderate (8 × 8), we must use a suitable algorithm or determine the appropriate operating wavelength to minimize the power imbalance. An efficient two-step algorithm (ETS) has particular advantages in solving the path fairness problem and mitigating the power imbalance. As the number of ports increases, the switch states and topology jointly deteriorate the power imbalance. Finally, the ETS algorithm narrows the dynamic range requirement to 13.66 dB, with a 2 dB improvement. It achieves an extinction ratio of 24 dB and a bandwidth of 375 GHz, which outperforms the conventional 32 × 32 Benes network, respectively.

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Section: Introductionmentioning

confidence: 99%

Making Path Selection Bright: A Routing Algorithm for On-Chip Benes Networks

Zhao,

Li,

2024

Electronics

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Alamouti coding enabled polarization insensitive simplified self-homodyne coherent system for short-reach optical interconnects

Wang,

Zou,

et al. 2025

Optics & Laser Technology

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Overcoming laser phase noise for low-cost coherent optical communication

Fang,

Zhu,

Cai

et al. 2024

Nat Commun

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Artificial-intelligence-generated content has driven explosive data traffic growth in data-center interconnects. Traditional direct detection solutions struggle with limited spectral efficiency and distance, prompting the shift to coherent optics for cost-sensitive short-reach links. One specific challenge is integrating low-cost lasers while overcoming severe phase noise on high-order modulation formats. Here, we propose a residual carrier modulation scheme for precise and efficient carrier frequency and phase recovery. The residual optical carrier can continuously track phase fluctuations without redundancy compared with discrete time-domain pilots, and address the digital-to-analog convertor resolution reduction issue of frequency-domain digital pilots. In proof-of-concept experiments, we transmit a net 1-Tb/s probabilistic-shaped 256-ary quadrature amplitude modulated (PS-256-QAM) signal using a 3 MHz distributed feedback (DFB) laser. Our scheme improves bitrate by 41% compared to conventional time-domain pilots, achieving a record laser linewidth sum and symbol duration product of 6.89 × 10−5. This approach supports MHz linewidth DFB lasers in low-cost coherent optical communications.

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Photonic Integrated Self-Coherent Homodyne Receiver Without Optical Polarization Control for Polarization-Multiplexing Short-Reach Optical Interconnects

Cited by 6 publications

References 27 publications

Making Path Selection Bright: A Routing Algorithm for On-Chip Benes Networks

Making Path Selection Bright: A Routing Algorithm for On-Chip Benes Networks

Alamouti coding enabled polarization insensitive simplified self-homodyne coherent system for short-reach optical interconnects

Overcoming laser phase noise for low-cost coherent optical communication

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