SOA Enabled Self-Homodyne Coherent Bidirectional Transmission for Metro-Datacenter Interconnects

Li, Weihao; Zhang, Mingming; Zeng, Yifan; Chen, Yizhao; Chen, Junda; Li, Yuqi; Tang, Ming

doi:10.1109/jlt.2023.3237720

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…The high insertion loss of the transmitter is one of the disadvantages of the system. Although EDFAs were used in the previous experiments [21,30,34], we believe that a costeffective SOA is required to make this system more attractive, such that it is cheap and integrable with other components, including a PD [4]. Then, the SOA would be located on the receiver side since the input power should be reduced to reduce the BER degradation (especially for the PAM-N signal) due to the nonlinear transfer characteristics arising from gain saturation [36,37].…”

Section: Discussionmentioning

confidence: 99%

“…Data centers have become essential infrastructure for society due to the rapid exploration of data traffic through high-definition video and audio streaming services, cloud services, and social networks [1][2][3][4]. The 400 gigabit Ethernet will employ multiple 50 or 100 Gb/s/λ 4-level pulse-amplitude modulation (PAM-4) signals as specified in the Ethernet standard [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Two-Channel OTDM System for Data-Center Interconnects: A Review

Bae

Kim

2023

Sensors

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It has been proposed to implement the >100 Gb/s data-center interconnects using a two-channel optical time-division multiplexed system with multilevel pulse-amplitude modulation. Unlike the conventional four-channel optical time-division multiplexed system which requires an expensive narrow pulse, the two-channel system can be implemented cost-effectively using a wide pulse (which can be simply generated using a single modulator). The two-channel system is expected to be practically available using an integrated transmitter in a chip due to the recent advances in photonics-integrated circuits. This paper reviews the current stage of research on a two-channel optical time-division multiplexed system and discusses possible research directions. Furthermore, it has been demonstrated that 200 Gb/s signals can be generated by using modulators with only 17.2 GHz bandwidth. Therefore, the use of the phase-alternating pulse can make the multiplexed signal robust to chromatic dispersion, enabling the 200 Gb/s 4-level pulse-amplitude-modulated signal to be transmitted over 1.9 km of standard single-mode fiber.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-Channel OTDM System for Data-Center Interconnects: A Review

Bae

Kim

2023

Sensors

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Unleashing 100-km Multi-Channel PDM Self-Homodyne Coherent Transmission by SOAs and All-Optical Nonlinear Distortion Mitigations

Li,

Chen,

Zeng

et al. 2024

J. Lightwave Technol.

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Non-invasive characterization of cascaded SOAs on InP-based photonic integrated circuits

Wang,

Shi,

Liu

et al. 2024

Opt. Express

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Semiconductor optical amplifiers (SOAs) are widely used as active elements in optical switching networks for their features of loss compensation and fast reconfiguration time. To optimize the SOA chain operation, it is essential to know the gain response of each SOA. However, the performance of the individual SOA in an on-chip network is challenging to characterize without additional splitters, which increases path insertion losses and, therefore, power consumption. In this work, to address these issues through a feasible and non-disruptive solution, a non-invasive pre-monitoring for N-cascaded SOAs on InP chips is proposed to assess the SOA gain and path losses between cascaded SOAs. This solution utilizes each SOA as both an optical amplifier (OA) and photodetector (PD), characterized by both light propagation directions, forward and backward. We experimentally demonstrate the non-invasive characterization method on a photonic integrated chip (PIC) containing 3-cascaded SOAs, which are part of a photonic integrated SOA-based optical neural network chip. Experimental results show that both losses between SOA and noise can be retrieved and used to obtain the SOA gain curves. The obtained SOA curves are in good agreement with the reference SOA measurements with errors <1.0 dB in gain and <1.5 dB in noise response. These results pave the way to automated non-invasive screening of N-cascaded SOAs in large-scale and packaged PICs.

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SOA Enabled Self-Homodyne Coherent Bidirectional Transmission for Metro-Datacenter Interconnects

Cited by 3 publications

References 35 publications

Two-Channel OTDM System for Data-Center Interconnects: A Review

Two-Channel OTDM System for Data-Center Interconnects: A Review

Unleashing 100-km Multi-Channel PDM Self-Homodyne Coherent Transmission by SOAs and All-Optical Nonlinear Distortion Mitigations

Non-invasive characterization of cascaded SOAs on InP-based photonic integrated circuits

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