1.12-Tbit/s PAM-4 Enabled by a Silicon Photonic Transmitter Bridged with a 7-Channel MCF

Yeyu Tong; Guan Hong Chen; Yi Wang; Zunyue Zhang; David Weng U. Chan; Chi Wai Chow; Hon Ki Tsang

doi:10.1109/LPT.2020.3007665

1.12-Tbit/s PAM-4 Enabled by a Silicon Photonic Transmitter Bridged with a 7-Channel MCF

Yeyu Tong, Guan Hong Chen, Yi Wang, Zunyue Zhang, David Weng U. Chan, Chi Wai Chow, Hon Ki Tsang^*

^*Corresponding author for this work

Department of Photonics

Research output: Contribution to journal › Article

Abstract

We demonstrate a high-capacity and ultra-compact silicon photonic transmitter directly coupled to a 7-channel multicore fiber (MCF). The integrated transmitter contains seven GeSi electro-absorption modulators (EAMs) connected with the perfectly vertical grating coupler (PVGC) array. A high port density for spatial-division multiplexing (SDM) is thus enabled by the out-of-plane coupling while not requiring angled polishing of the MCF. Relying on four-level pulse amplitude modulation (PAM-4) and digital signal processing (DSP), each of the EAMs can support a data rate of 160 Gbit/s in the back-to-back system. The obtained bit-error-rate (BER) is below the low-latency 7% hard-decision forward-error-correct (HD-FEC) coding limit. The integrated transmitter has a total data-rate-capacity of 1.12 Tbit/s over the seven spatial channels and a compact footprint of 1.8 mm × 0.45mm. BER performance of the optimum spatial channel is evaluated at different wavelengths, revealing its potential for possible wavelength-division multiplexing (WDM) by the on-chip wavelength (de)multiplexers in the future.

Original language	English
Article number	9134901
Pages (from-to)	987-990
Number of pages	4
Journal	IEEE Photonics Technology Letters
Volume	32
Issue number	16
DOIs	https://doi.org/10.1109/LPT.2020.3007665
State	Published - 15 Aug 2020

Keywords

electro-absorption modulator
short-reach communication
Silicon photonics
spatial-division multiplexing
GRATING COUPLER
GB/S NRZ
EFFICIENCY
BANDWIDTH
MODULATOR

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title = "1.12-Tbit/s PAM-4 Enabled by a Silicon Photonic Transmitter Bridged with a 7-Channel MCF",

abstract = "We demonstrate a high-capacity and ultra-compact silicon photonic transmitter directly coupled to a 7-channel multicore fiber (MCF). The integrated transmitter contains seven GeSi electro-absorption modulators (EAMs) connected with the perfectly vertical grating coupler (PVGC) array. A high port density for spatial-division multiplexing (SDM) is thus enabled by the out-of-plane coupling while not requiring angled polishing of the MCF. Relying on four-level pulse amplitude modulation (PAM-4) and digital signal processing (DSP), each of the EAMs can support a data rate of 160 Gbit/s in the back-to-back system. The obtained bit-error-rate (BER) is below the low-latency 7% hard-decision forward-error-correct (HD-FEC) coding limit. The integrated transmitter has a total data-rate-capacity of 1.12 Tbit/s over the seven spatial channels and a compact footprint of 1.8 mm × 0.45mm. BER performance of the optimum spatial channel is evaluated at different wavelengths, revealing its potential for possible wavelength-division multiplexing (WDM) by the on-chip wavelength (de)multiplexers in the future.",

keywords = "electro-absorption modulator, short-reach communication, Silicon photonics, spatial-division multiplexing, GRATING COUPLER, GB/S NRZ, EFFICIENCY, BANDWIDTH, MODULATOR",

author = "Yeyu Tong and Chen, {Guan Hong} and Yi Wang and Zunyue Zhang and Chan, {David Weng U.} and Chow, {Chi Wai} and Tsang, {Hon Ki}",

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AU - Tong, Yeyu

AU - Chen, Guan Hong

AU - Wang, Yi

AU - Zhang, Zunyue

AU - Chan, David Weng U.

AU - Chow, Chi Wai

AU - Tsang, Hon Ki

PY - 2020/8/15

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N2 - We demonstrate a high-capacity and ultra-compact silicon photonic transmitter directly coupled to a 7-channel multicore fiber (MCF). The integrated transmitter contains seven GeSi electro-absorption modulators (EAMs) connected with the perfectly vertical grating coupler (PVGC) array. A high port density for spatial-division multiplexing (SDM) is thus enabled by the out-of-plane coupling while not requiring angled polishing of the MCF. Relying on four-level pulse amplitude modulation (PAM-4) and digital signal processing (DSP), each of the EAMs can support a data rate of 160 Gbit/s in the back-to-back system. The obtained bit-error-rate (BER) is below the low-latency 7% hard-decision forward-error-correct (HD-FEC) coding limit. The integrated transmitter has a total data-rate-capacity of 1.12 Tbit/s over the seven spatial channels and a compact footprint of 1.8 mm × 0.45mm. BER performance of the optimum spatial channel is evaluated at different wavelengths, revealing its potential for possible wavelength-division multiplexing (WDM) by the on-chip wavelength (de)multiplexers in the future.

AB - We demonstrate a high-capacity and ultra-compact silicon photonic transmitter directly coupled to a 7-channel multicore fiber (MCF). The integrated transmitter contains seven GeSi electro-absorption modulators (EAMs) connected with the perfectly vertical grating coupler (PVGC) array. A high port density for spatial-division multiplexing (SDM) is thus enabled by the out-of-plane coupling while not requiring angled polishing of the MCF. Relying on four-level pulse amplitude modulation (PAM-4) and digital signal processing (DSP), each of the EAMs can support a data rate of 160 Gbit/s in the back-to-back system. The obtained bit-error-rate (BER) is below the low-latency 7% hard-decision forward-error-correct (HD-FEC) coding limit. The integrated transmitter has a total data-rate-capacity of 1.12 Tbit/s over the seven spatial channels and a compact footprint of 1.8 mm × 0.45mm. BER performance of the optimum spatial channel is evaluated at different wavelengths, revealing its potential for possible wavelength-division multiplexing (WDM) by the on-chip wavelength (de)multiplexers in the future.

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