Browsing by Author "Wu, Xinru"

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192-Gbit/s PAM-4 Optical Interconnect using Mode-Division Multiplexing
(2018-01-01)
Hsu, Yung
;
Wu, Xinru
;
Chuang, Chun-Yen
;
Chow, Chi-Wai
;
Tsang, Hon Ki
192-Gbit/s pulse-amplitude-modulation-4 (PAM-4) signal transmission for on-chip optical interconnects using mode-division-multiplexing (MDM) is experimentally investigated. 3 channels are successfully mode multiplexed and de-multiplexed satisfying the forward-error correction (FEC) requirement.
2.6 Tbit/s On-Chip Optical Interconnect Supporting Mode-Division-Multiplexing and PAM-4 Signal
(2018-06-01)
Hsu, Yung
;
Chuang, Chun-Yen
;
Wu, Xinru
;
Chen, Guan-Hong
;
Hsu, Chin-Wei
In this letter, we combine the use of dense-wavelength-division-multiplexing and mode-division-multiplexing (MDM) with advanced-modulation formats for on-chip optical interconnects. A three-mode MDM multiplexer (MUX) and de-multiplexer (DEMUX) was designed and used. Each wavelength carrier had an aggregate data rate of 192-Gbit/s using 4-level pulse-amplitude-modulation. The mode crosstalk of the MDM MUX/DEMUX was measured to he below -20 dB in the 40-nm wavelength band from 1520 to 1560 nm. Fourteen wavelength channels are multiplexed and successfully transmitted with an aggregate transmission capacity of 2.6 Tbit/s (14 wavelengths x 3 modes x 64 Gbit/s) with all channels satisfying the hard-decision forward-error-correction threshold. Numerical analysis of the mode crosstalk is also performed.
512-Gbit/s PAM-4 Signals Direct-Detection using Silicon Photonics Receiver with Volterra Equalization
(2018-01-01)
Hsu, Yung
;
Chuang, Chun-Yen
;
Wei, Liang-Yu
;
Chow, Chi-Wai
;
Wu, Xinru
A 400-Gbit/s Ethernet (GbE) pulse-amplitude-modulation-4 (PAM-4) over 10-km single-mode-fiber (SMF) transmission direct-detected by an integrated silicon-photonics-receiver satisfying the IEEE P802.3bs requirement; and its feasibility to support 512-Gbit/s were illustrated.
64-Gbit/s PAM-4 20-km Transmission Using Silicon Micro-ring Modulator for Optical Access Networks
(2017-01-01)
Hsu, Yung
;
Tzu, Ta-Ching
;
Lin, Tien-Chien
;
Chung, Chun-Yen
;
Wu, Xinru
We demonstrate the feasibility of using silicon-micro-ring-modulators for 50-Gbitis and 64-Gbit/s pulse-amplitude-modulation-4 (PAM-4) communications in a 20-km single-mode fiber (SMF) link with Volterra-filtering. The integrated transmitter may be used in passive optical-access-networks with 20-kin-reach and 64-split-ratio.
Amplitude and Phase Modulation of UWB Monocycle Pulses on a Silicon Photonic Chip
(2016-02-01)
Xu, Ke
;
Wu, Xinru
;
Sung, Jiun-Yu
;
Cheng, Zhenzhou
;
Chow, Chi Wai
We demonstrate both the amplitude and bi-phase modulation of ultrawideband (UWB) monocycle pulses using silicon microring modulator. The integrated silicon ring modulator generates the monocycle pulse train and modulates it simultaneously. By applying different driving voltages, the amplitude and phase-modulated UWB signal with a data rate of 2.5 Gb/s are achieved. The ring modulator can be thermally tuned for a free spectral range with a similar to 50-mW power consumption.
Compact and High-Speed Ge Franz-Keldysh I/Q Modulator Used with Kramers-Kronig Receiver
(2018-01-01)
Tong, Yeyu
;
Zhang, Qiulin
;
Wu, Xinru
;
Chow, Chi-Wai
;
Shu, Chester
We propose a compact and high-speed FQ modulator based on two germanium-on-silicon Franz-Keldysh electro-absorption modulators. We demonstrate a 4-QAM signal transmission and reconstruct the complex signal in a Kramers-Kronig receiver for future datacenter interconnect applications.
Integrated germanium-on-silicon Franz-Keldysh vector modulator used with a Kramers-Kronig receiver
(2018-09-15)
Tong, Yeyu
;
Zhang, Qiulin
;
Wu, Xinru
;
Chow, Chi-Wai
;
Shu, Chester
We propose an integrated vector modulator based on two compact and high-speed germanium-on-silicon Franz Keldysh electro-absorption modulators. The proposed vector modulator is extremely compact with a total footprint of only 1800 mu m x 200 mu m. We further experimentally demonstrate a 4-quadrature-amplitude-modulation (4-QAM) at 40 Gb/s over a 20-km standard single-mode fiber transmission. The complex signal is successfully reconstructed with a single-ended photodiode in a recently proposed Kramers-Kronig receiver for future low-cost, low-power, and low-footprint datacenter interconnect applications. The preliminary performance of the vector modulator with a 16-QAM is also investigated. (c) 2018 Optical Society of America.
Scalable Ultra-Wideband Pulse Generation Based on Silicon Photonic Integrated Circuits
(2017-11-01)
Wu, Xinru
;
Xu, Ke
;
Zhou, Wen
;
Chow, Chi Wai
;
Tsang, Hon Ki
We demonstrate a scalable ultra-wideband (UWB) pulse generator using silicon photonic integrated circuits. A delay-and-superimpose principle for higher order UWB Guassian pulse generation is realized by monolithically integrating a pair of tunable microring resonators, a delayline waveguide, tap couplers, and an on-chip photodiode. The two microrings function as discrimination filters and generate the asymmetric monocycle pulses. For a proof-of-concept demonstration, the doublet pulses with a 10-dB fractional bandwidth of 100% and the triplet pulses with a 10-dB fractional bandwidth of 132% are generated by superposition of the two asymmetric pulses with a proper delay between them. The proposed scheme and the photonic chip can be scaled to generate more kinds of power-efficient pulses.