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53-Gbaud-PAM4 differential drive of a conventional EA/DFB was demonstrated. Almost the same waveform as single-ended drive was confirmed with outer ER of 4.1 dB and TDECQ of 1.63 dB by differential drive with 0.57 V pp /lane.

A passive optical alignment based on a lens-integrated surface-emitting laser array and a single-mode fiber array was demonstrated. The proposed alignment technique enables better coupling efficiency than that of conventional DFB laser with active alignment.

Low-cost optical assemblies for optical interconnections using lens-integrated surface-emitting laser are proposed. High coupling efficiency with single-mode-fibers of over −1.9dB and RIN below −140dB/Hz with large back reflection and 85°C/85% storage test are demonstrated.

A 50-Gb/s optical transmitter, consisting of a DFB-LD with a bandwidth of 20 GHz and a SiGe BiCMOS LD driver, was developed. At 43-50 Gb/s, it enhanced a LD bandwidth and demonstrated wide eye openings.

A 103.2 (25.8 × 4)-Gb/s optical link using a 1.3-µm lens-integrated surface-emitting laser array was demonstrated. A power penalty after 2-km transmission was small (

A compact 4 25-Gbps optical transceiver for short-reach communications using optical interconnects was developed. Its total power consumption is 2.2 W. A transmission experiment with the transceiver was successfully conducted at 25-Gbps data rate.

A compact optical low-power (9 mW/Gbps) transceiver with lens integrated devices and 12-ch flexible waveguides for optical interconnects was developed. It provides high optical-coupling efficiency and large tolerances (>-2.5 dB and >+/-15 μm) and demonstrated 25-Gbps/ch error-free transmission.

A low-power transceiver for optical interconnects, composed of 1.3-um-range microlens-integrated optical devices and CMOS ICs, was developed. It demonstrated 25-Gbit/s error-free transmission with over-100-m multi-mode fiber (MMF) and low-power consumption of 9 mW/Gbit/s.

Multiple-wavelength 25-Gb/s operation of a 1.3-μm-range surface-emitting laser array was demonstrated. The fabricated laser array, which consists of nine distributed-feedback (DFB) active stripes operating between 1260 and 1290 nm at 3.7-nm intervals exhibited clear 25-Gb/s eye openings.

We developed a high-speed (20 Gbps/channel) and large-capacity (1 Tbps/board) optical printed circuit board with a proposed two-lens optical coupling structure and a low-power (7.1 mW/Gbps) optical module using a CMOS IC, and successfully demonstrated 20-Gbps/ch operation in our optical interconnection.

A compact 25-Gbps × 4-channel optical transceiver has been fabricated for optical backplane systems. Power consumption was as low as 20 mW/Gbps. A transmission experiment was successfully conducted at 25 Gbps.

The uncooled 25-Gbit/s direct modulation of a 1.3-µm horizontal-cavity surface-emitting laser was demonstrated. A fabricated laser, which is directly mountable on a high-frequency coplanar line, exhibited 25-Gbit/s eye openings up to 100°C.

We developed a high-speed (20 Gbps) and high-density (480 Gbps/cm2) optical printed circuit board with a new two-lens optical interface for optical interconnections, and successfully demonstrated a 20-Gbps operation in our optical interconnection.

A novel 1.3-µm surface-emitting laser integrated with a monolithic InP bulk lens was demonstrated. The laser achieved very narrow far-field angles of around 2° leading to a −2.7 dB direct coupling to a single-mode fiber.