Akinori Hayakawa

10 Gb/s Wavelength-Tunable EML with Continuous Wavelength Tuning Covering 50 GHz × 8 Channels on ITU Grid

A wavelength-tunable EA-modulated laser (wavelength-tunable EML) using tunable distributed amplification (TDA) structure was demonstrated. An 80 km transmission of 10 Gb/s signals was confirmed on 8 channels on ITU grid using the devices simple, continuous tuning mechanism.

22.2 A 25Gb/s hybrid integrated silicon photonic transceiver in 28nm CMOS and SOI

Integrated photonic interconnect technology is free from the bandwidth-distance limitation that intrinsically exists in electrical interconnects, promising a disruptive alternative for next-generation scalable data centers. Silicon photonic platforms have been reported based on monolithic and hybrid integration. Monolithic systems mitigate integration overhead but require compromise in either electronic or photonic device performance [1,2]. Hybrid integration allows for independent process selection for each device so that overall system can potentially achieve the best performance [3]. This paper presents a hybrid integrated electrical-optical (E-O) interface including a driver/TIA chip in 28nm CMOS and a modulator/PD chip in SOI, based on a mixed-pitch bumping technology. A pseudo-differential driver with pre-emphasis enables an 800MHz bandwidth (BW) carrier-injection ring modulator to operate at 25Gb/s with power efficiency of 2.9pJ/b. A TIA implements two BW-enhancement techniques: a regulated-cascode (RGC) input stage with shunt-shunt feedback and T-coil inductive peaking, and a hybrid offset calibration, achieving 25Gb/s with power efficiency of 2.0pJ/b and a sensitivity of -8.0dBm OMA.

Mode-Hop-Free and Electrically Wavelength-Tunable Laser Array with 39.5 nm Tuning Range using Tunable Distributed Amplification DFB Structure

An electrically wavelength-tunable laser array with tunable distributed amplification (TDA) DFB structure has been developed for the first time. A tuning range of 39.5 nm has been achieved by monolithic array of 8-channel mode-hop-free lasers

Tunable Twin-Guide Distributed Feedback Laser with 8-nm Mode-Hop-Free Tuning Range

A tunable twin-guide distributed feedback laser with a mode-hop-free tuning range of 8 nm has been developed by reducing the loss increment in its tuning layer.

High-Speed Wavelength Tuning of Tunable Distributed Amplification DFB-LD in Long Haul Transmission

We clarified for the first time the influence of tuning current noise on linewidth broadening and transmission for TDA-DFB-LD. Suppressing noise at higher frequencies, we demonstrated 300-ns high-speed wavelength switching without degradations in 80-km transmission.

High-dense integrated 25-Gbps silicon photonic transmitter and receiver for on-package optical interconnect

We propose a high-dense integrated silicon photonics transmitter and receiver with a novel bridge structure for on-package optical interconnects. We verified an error-free operation of 25 Gbps between developed transmitter and receiver with a power efficiency of 9.6 mW/Gbps.