Ichiro Hatakeyama

1-Gbyte/sec array transmitter and receiver modules for low-cost optical fiber interconnection

Eight-channel 1-Gbit/s array optical transmitter and receiver modules with 1.3-/spl mu/m wavelength have been developed using a passive-alignment assembly technology and one-chip transmitter and receiver LSIs, to achieve short-haul optical fiber interconnection cost effectively. It features a large dynamic range receiver that can tolerate the power fluctuation in low-cost adjustment-free transmitters and the loss deviation in cascaded optical connectors.

A 10 Gbps x 12 channel pluggable optical transceiver for high-speed interconnections

We developed a 10 Gbps x 12 channel pluggable optical transceiver. It consists of three photoelectric devices, an FR4 substrate with a microcontroller, a 12 x 2 multimode fiber with three optical connectors for the three photoelectric devices, an electrical connector, and a heat sink. This transceiver can be vertically plugged to the motherboard by using electrical connector. A vertical plug enables the photoelectric conversion devices in the optical transceiver to be located close to the logic LSI on the motherboard at high density to prevent the waveform degrading. Moreover, it is possible to do prompt repairs if the transceiver breaks down because the module is pluggable. We demonstrated error-free operation after 50 m transmission over a GI/50 multimode fiber (MMF). These performance characteristics indicated that this optical transceiver is feasible for implementation in high- throughput interconnections.

Optical interconnection as an IP macro of a CMOS library

With the aim of producing a switch LSI with several-hundred-Gb/s-class throughput, we first developed LAN-LSIs with 10-Gb/s-class optical input/output (I/O) buffer. The optical I/O buffer was supplied as a set consisting of an optical-electrical package, soft or hard macros of the optical interface, and library files for a targeted CMOS technology. Using such library files, system LSI designers can implement an optical interface in their chips in a conventional design manner.

A 400 Gbps backplane switch with 10 Gbps/port optical I/O interfaces

A 400 Gbps backplane switch was developed with low-cost, small-size, 8-channels 10 Gbps/port optical I/O and a SiGe Bi-CMOS switch LSI on a 60x60-mm2 BGA package. It indicates the applicability of backplane switch for high throughput backplane interconnections.

A 400Gbps backplane switch with 10Gbps/port optical I/O interfaces based on OIP (optical interconnection as IP of a CMOS library)

A 400 Gbit/s backplane switch was developed with a low-cost, small-size, 8-channel 10 Gbit/s/port optical I/O and a SiGe Bi-CMOS switch LSI on a 60/spl times/60-mm-square BGA package. It indicates the applicability of OIP for high throughput backplane interconnections.

Data-format-free 622-Mbit/s/ch 12-channel parallel optical transmitter and receiver

A data-format-free 622-Mbit/s/ch 12-channel optical transmitter and receiver have been developed. They provide a skewless PECL interface parallel link for 100-m transmission operating in the ambient temperature range from 0-70/spl deg/C with a 3.3 V power supply.

16x16 crosspoint switch module with 3.125-Gbit/port optical I/O interfaces based on OIP (optical-interconnection as IP) design concept

An optical interface is expected to solve the problems the electrical counterpart has. However, the conventional optical interface system using optical transceiver modules separately located from LSI packages on a printed circuit board (PCB), electrical interfaces among optical transceivers and LSI packages would limit interconnection speed. In addition, the electrical interface consumes a lot of power to drive the I/O buffers and signal lines on the PCB. To solve these problems, we have proposed a packaging technology to which OIP (Optical-interconnection as Intellectual Property) concept is applied. We developed a 3.125-Gbit/s/port crosspoint switch with 16 optical I/O ports on a 35x35-mm BGA package. It incorporates four small optical I/O modules called PETIT (Photonic/Electronic Tied InTerface).The PETIT consists of a 4-channel VCSEL array, a 4-channel pin-PD array, and a GaAs trans-impedance amplifier on an 8x8-mm ceramic substrate, and a newly developed optical connector interface is attached on the substrate. The sensitivity is 11.9 dBm under 12.5-Gbit/s full-duplex operation of the PETIT.

Low cross talk 8-channel array optical transmitter and receiver for star topology access networks

Summary form only given. In conclusion, a low crosstalk 8-channel optical transceiver was developed for star topology access networks for the first time. A receiver dynamic range of 21.6 dB and an allowable interchannel receiving power difference of 16.6 dB, both large enough for fiber in the loop (FITL) system with a serving area of 7.2 km, were obtained at 155 Mbit/s.