Compact 8-wavelength receiver optical sub-assembly with a low-loss AWG demultiplexer for 400-gigabit datacom

Doi, Yoshihiro; Nakanishi, Y.; Yoshimatsu, Toshihide; Ohno, Takao; Sanjo, Hiroaki

doi:10.1109/ecoc.2015.7341911

Cited by 6 publications

(9 citation statements)

References 4 publications

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“…For example, ramping up to 200-Gb/s throughput was achieved by adopting four-level pulse-amplitude modulation (PAM4) [18]. In addition, we have also developed a 400-Gb/s photoreceiver using eight-channel WDM together with the PAM4 format [21]. Moreover, we have demonstrated 400-Gb/s aggregations of 16 λ × 25-Gb/s NRZ and 8 λ × 50-Gb/s PAM4 signals by using the 100GbE devices and functional cyclic AWGs [19,20].…”

Section: Receiver Integration For Wdm With Throughput By 100-gb/s and Beyondmentioning

confidence: 99%

“…Section 2 describes the basic design of the MM-AWG and covers another essential factor, namely optical coupling between multimode output and a photodiode (PD). In later sections, we describe our WDM photoreceivers for 10, 40, and 100 Gb/s and beyond in detail [14][15][16][17][18][19][20][21] along with recent progress on 400-Gb/s transmission. Section 6 summarizes the paper.…”

Section: Introductionmentioning

confidence: 99%

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Receiver Integration with Arrayed Waveguide Gratings toward Multi-Wavelength Data-Centric Communications and Computing

et al. 2020

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This paper reviews receivers that feature low-loss multimode-output arrayed waveguide gratings (MM-AWGs) for wavelength division multiplexing (WDM) as well as hybrid integration techniques with high-speed throughput of up to 100 Gb/s and beyond. A design of optical coupling between higher-order multimode beams and a photodiode for a flat-top spectral shape is described in detail. The WDM photoreceivers were fabricated with different approaches. A 10-Gb/s photoreceiver was developed for a 1.25-Gb/s baud rate and assembled for eight-channel WDM by mechanical alignment. A receiver with 40-Gb/s throughput was built by using visual alignment for a 10-Gb/s baud rate and four-channel WDM. A 100-Gb/s receiver assembled by active alignment with a four-channel by 25-Gb/s baud rate is the basis for beyond-100 Gb/s and future multi-wavelength integrated devices toward data-centric communications and computing.

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Section: Receiver Integration For Wdm With Throughput By 100-gb/s and Beyondmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Receiver Integration with Arrayed Waveguide Gratings toward Multi-Wavelength Data-Centric Communications and Computing

et al. 2020

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“…Silicon photonics stands out as a highly promising technological platform for the development of photonic integrated circuits (PICs) characterized by high bandwidth and low energy consumption. Considering silicon-based PICs [8][9][10][11][12][13][14][15], together with several photonic components such as laser diodes, optical modulators, and photodetectors, optical waveguide type demultiplexers (DeMUXs) such as microring resonators [16][17][18][19], delayed interferometers (DIs) [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36], or arrayed waveguide gratings (AWGs) [37][38][39][40][41][42][43][44][45][46][47][48] are normally needed to filter the WDM optical signals spatially out to each photodetector to be decoded.…”

Section: Introductionmentioning

confidence: 99%

Silicon-Nanowire-Based 100-GHz-Spaced 16λ DWDM, 800-GHz-Spaced 8λ LR-8, and 20-nm-Spaced 4λ CWDM Optical Demultiplexers for High-Density Interconnects in Datacenters

Jeong

2024

Photonics

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Several types of silicon-nanowire-based optical demultiplexers (DeMUXs) for use in short-reach targeted datacenter applications were proposed and their spectral responses were experimentally verified. First, a novel 100-GHz-spaced 16λ polarization-diversified optical DeMUX consisting of 2λ delayed interferometer (DI) type interleaver and 8λ arrayed waveguide gratings will be discussed in the spectral regimes of C-band, together with experimental characterizations showing static and dynamic spectral properties. Second, a novel 800-GHz-spaced 8λ optical DeMUX was targeted for use in LR (long reach) 400 Gbps Ethernet applications. Based on multiple cascade-connected DIs, by integrating the extra band elimination cutting area, discontinuous filtering response was analytically identified with a flat-topped spectral window and a low spectral noise of <−20 dB within an entire LR-8 operating wavelength range. Finally, a 20-nm-spaced 4λ coarse wavelength division multiplexing (CWDM)-targeted optical DeMUX based on polarization diversity was experimentally verified. The measurement results showed a low excessive loss of 1.0 dB and a polarization-dependent loss of 1.0 dB, prominently reducing spectral noises from neighboring channels by less than −15 dB. Moreover, TM-mode elimination filters were theoretically analyzed and experimentally confirmed to minimize unwanted TM-mode-oriented polarization noises that were generated from the polarization-handling device. The TM-mode elimination filters functioned to reduce polarization noises to much lower than −20 dB across the entire CWDM operating window.

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“…Hybrid integration is the best and most accessible technology to be applied considering cost and size. At the receiving end, there are two main types of hybrid integration, one is using thin-film filters as demultiplexers [9] and the other one is using the PLC AWG as demultiplexers [10] in recent years. However, the lens and prism are used frequently to change the propagation of light or select specified wavelength, and it increases the assembly complexity and cost.…”

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confidence: 99%

“…A flat-top spectrum as expected design was obtained and the single channel 1 dB bandwidth ranges from 2.12 nm to 3.06 nm, which is close to the 2.8 nm 0.5 dB bandwidth of international level. [10] However, the performance of fifth and eighth channels is not very ideal. The insertion loss of the fifth channel is slightly higher than the other channels, which may be caused by the fabrication process.…”

mentioning

confidence: 99%

The 8×10 GHz Receiver Optical Subassembly Based on Silica Hybrid Integration Technology for Data Center Interconnection

Wang

et al. 2017

Chinese Phys. Lett.

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An 8×10 GHz receiver optical sub-assembly (ROSA) consisting of an 8-channel arrayed waveguide grating (AWG) and an 8-channel PIN photodetector (PD) array is designed and fabricated based on silica hybrid integration technology. Multimode output waveguides in the silica AWG with 2% refractive index difference are used to obtain flat-top spectra. The output waveguide facet is polished to 45° bevel to change the light propagation direction into the mesa-type PIN PD, which simplifies the packaging process. The experimental results show that the single channel 1 dB bandwidth of AWG ranges from 2.12 nm to 3.06 nm, the ROSA responsivity ranges from 0.097 A/W to 0.158 A/W, and the 3 dB bandwidth is up to 11 GHz. It is promising to be applied in the eight-lane WDM transmission system in data center interconnection.

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Compact 8-wavelength receiver optical sub-assembly with a low-loss AWG demultiplexer for 400-gigabit datacom

Cited by 6 publications

References 4 publications

Receiver Integration with Arrayed Waveguide Gratings toward Multi-Wavelength Data-Centric Communications and Computing

Receiver Integration with Arrayed Waveguide Gratings toward Multi-Wavelength Data-Centric Communications and Computing

Silicon-Nanowire-Based 100-GHz-Spaced 16λ DWDM, 800-GHz-Spaced 8λ LR-8, and 20-nm-Spaced 4λ CWDM Optical Demultiplexers for High-Density Interconnects in Datacenters

The 8×10 GHz Receiver Optical Subassembly Based on Silica Hybrid Integration Technology for Data Center Interconnection

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