Scalable and Fast Optical Circuit Switch Based on Colorless Coherent Detection: Design Principle and Experimental Demonstration

Matsumoto, Ryosuke; Inoue, Takashi; Konoike, Ryotaro; Matsuura, Hiroyuki; Suzuki, Keijiro; Mori, Yojiro; Ikeda, Kazuhiro; Namiki, Shu; Sato, Ken-ichi

doi:10.1109/jlt.2021.3050734

Cited by 14 publications

(9 citation statements)

References 30 publications

(47 reference statements)

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“…Figure 6 illustrates how signal quality is degraded by LO-crosstalk-induced noise in colorless coherent detection, where the OOB channels and LO crosstalk generate in-band crosstalk. Numerical analyses that extend the previous work [20] quantify the performance limit associated with LO crosstalk. Without loss of generality, we assume a conventional coherent receiver employing polarization beam splitters (PBSs), optical 90° hybrid mixers, and four pairs of BPDs.…”

Section: B Crosstalk Analysis For Colorless Coherent Detectionmentioning

confidence: 55%

“…Control network design issues including control latency and overall blocking performances were elaborated in our recent paper [9,32]. The benefits of the hybrid network solution have been demonstrated in terms of power consumption [31], bandwidth scalability [9,20], architectural simplification and a substantial reduction (more than 70 % [9]) in interconnection hardware (transceivers and fibers) due to switching tier reduction [15]. In addition, its performance benefits such as reduced job completion times [18,33,34] or increased throughput [35] have been clarified for machine learning applications that handle large data blocks, which includes using the Hadoop filesystem (e.g., typical size of data block is 64 -128 Mbyte) which is commonly adopted for deep learning model and big-data analysis.…”

Section: Switching Technologies In Intra-data Centersmentioning

confidence: 99%

“…To maximize the port count of the optical switch, we need to consider the interplay between the removed TF loss and induced self-beat noise. Our design principle, presented in a previous paper [20], uses colorless coherent detection instead of conventional (filtered) detection; assuming a Silicon-photonic TF loss of 10 dB, the port count is quadrupled.…”

Section: A Colorless Coherent Detectionmentioning

confidence: 99%

“…Our recent work modeled a colorless coherent receiver for detecting a WDM signal using an ideal LO light (i.e., high carrier-to-noise ratio and no crosstalk) [20]. However, an actual LO bank suffers crosstalk from TFs, which can degrade signal quality such as signal-to-noise ratio (SNR), Q-factor, and bit error ratio (BER).…”

Section: B Crosstalk Analysis For Colorless Coherent Detectionmentioning

confidence: 99%

“…An optical switching network employing coherent technologies provides a viable solution toward high-capacity and large-scale data center interconnection [19,20]. Thanks to the enhanced transmission capacity and loss budget, they are now widely adopted for core and metro networks including inter data center networks.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Scalable Optical Circuit Switch Employing Fast-Tunable AMZI Filters for Coherent Detection

Matsumoto

Konoike

Matsuura

et al. 2023

J. Lightwave Technol.

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High-port-count optical switches are expected to resolve the envisaged bandwidth and power crunch in intra-data center networks stemming from the slowdown of Moore's Law. This paper briefly reviews electrical switching technologies in current intra-data centers and discusses requirements for optical circuit switches in future data centers. We highlight an optical switch architecture that combines the two independent dimensions of space and wavelength to realize large port counts and fast switching. Wavelength routing is implementable with receiver-side channel selection using wavelength tunable filters (TFs). Coherent detection necessitates a fast-tunable local oscillator (LO) at the receiver. It can be cost-effectively realized using an LO bank that consists of fixed-wavelength laser sources and Silicon-photonic asymmetric Mach-Zehnder interferometer (AMZI) filters. Colorless detection that removes a TF at the front of the receiver is possible when the number of WDM channels is small, however, as the number exceeds a certain limit the TF is needed to prevent power saturation of the receiver. We present an effective cooperative filtering scheme for transmission signals and LO channels sourced from an LO bank; it can detect C-band WDM coherent signals while easing the receiver's power limitation. The scheme is analyzed to clarify receiver performance and the switch port-count bounds under various operating conditions. We demonstrate that the cooperative filtering scheme effectively works from 60 (typical of coherent receivers) to >116 wavelength channels, which is verified by experiments for 1,856 × 1,856 optical switching with the short switching time of 3.2 μs.

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Section: B Crosstalk Analysis For Colorless Coherent Detectionmentioning

confidence: 55%

Section: Switching Technologies In Intra-data Centersmentioning

confidence: 99%

Section: A Colorless Coherent Detectionmentioning

confidence: 99%

Section: B Crosstalk Analysis For Colorless Coherent Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Scalable Optical Circuit Switch Employing Fast-Tunable AMZI Filters for Coherent Detection

Matsumoto

Konoike

Matsuura

et al. 2023

J. Lightwave Technol.

Self Cite

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Simplified colorless characterization scheme for coherent receivers in DWDM scenarios using a single interferer

Reyes-Iglesias,

Ortega-Moñux,

Izquierdo

et al. 2024

Optical Fiber Technology

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Fast-Convergence Digital Signal Processing for Coherent PON Using Digital SCM

Wang

Zhou

Xing

et al. 2023

J. Lightwave Technol.

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Optical access networks have been evolving to meet the explosive growth of data traffic. It is foreseeable that the 100Gb/s/λ and beyond passive optical network (PON) will be required in future optical access networks. Coherent optical communication is a promising solution for the future beyond 100G PON. However, the traditional digital signal processing (DSP) for coherent optical communication is difficult to realize fast convergence due to blind and complex algorithms. In this paper, we design a specific preamble structure and propose a burst-mode DSP to achieve fast convergence for the coherent PON. For verifying the feasibility of the proposed scheme, pointto-multi-point (P2MP) coherent PON is experimentally built up based on digital subcarrier multiplexing (DSCM), which is a kind of frequency division multiple access. When the allocated frequency of the optical network unit is suddenly changed, the DSP should converge fast to ensure a low handoff latency. In P2MP coherent PON, the proposed specific preamble structure and burst-mode DSP jointly implement the fast convergence using a short preamble with only 416 symbols. The experimental results show that the 8-Gbaud/SC×8-SCs 400Gb/s-net-rate coherent PON in burst-mode detection achieves the receiver sensitivity of approximately −27dBm at the 20% soft-decision forward error correction limit and approximately 35.5dB optical power budget with an optical pre-amplifier.

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Scalable and Fast Optical Circuit Switch Based on Colorless Coherent Detection: Design Principle and Experimental Demonstration

Cited by 14 publications

References 30 publications

Performance Analysis of Scalable Optical Circuit Switch Employing Fast-Tunable AMZI Filters for Coherent Detection

Performance Analysis of Scalable Optical Circuit Switch Employing Fast-Tunable AMZI Filters for Coherent Detection

Simplified colorless characterization scheme for coherent receivers in DWDM scenarios using a single interferer

Fast-Convergence Digital Signal Processing for Coherent PON Using Digital SCM

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