Tsuyoshi Shimoda

Multiple-chip precise self-aligned assembly for hybrid integrated optical modules using Au-Sn solder bumps

We have developed a novel three-dimensional high precision self-aligned assembly using stripe-type Au-Sn solder bumps and a micro-press solder bump formation method. This produces a high bonding precision of 1 /spl mu/m for optical device assembly in both lateral and vertical directions without the need for time-consuming optical axes alignment. Furthermore, we tested a hybrid integrated 4/spl times/4 optical matrix switch, in which multiple SSC-SOAG arrays were simultaneously positioned and optical fibers were passively positioned on a silica based PLC platform using this technology. Four optical chips and seven wiring chips are assembled on a planar lightwave circuit (PLC) platform. The insertion loss for each of these paths at an injection current of 40 mA was within a range of 9/spl plusmn/4 dB. The average extinction ratio was 40 dB. This self-aligned assembly technology was shown to be useful for building hybrid-integrated multichannel optical network components.

A low-loss, compact wide-FSR-AWG using SiON planar lightwave circuit technology

Wide FSR of 80 nm with SiON high-/spl Delta/ technology reduced loss variation among channels of a 40-channel AWG to 0.6 dB with low insertion-loss of less than 2.2 dB for all channels without chip-size enlargement.

168 Gbps error-free demultiplexing with hybrid-integrated symmetric Mach-Zehnder all-optical switch

The symmetric Mach-Zehnder (SMZ) all-optical switch is quite promising for various types of future high-speed all-optical processing. We have developed a hybrid-integrated SMZ all-optical switch and achieved the error-free demultiplexing of 168 Gbps data pulses.

Ultrahigh-speed all-optical data regeneration and wavelength conversion for OTDM systems

The latest results in ultrafast data regeneration and wavelength conversion with SMZ-type all-optical semiconductor switches are reviewed. In these operations, the SMZ-type switch is driven by random data pulses. The fastest bit rate reported to date for such input-data-driven all-optical operation has reached 168 Gb/s. With these all-optical devices, we may be able to build 160-Gb/s OTDM nodes for packet communications systems in the near future.