Naoki Shamoto

Image fiber optic space-CDMA parallel transmission experiment using 8 x 8 VCSEL/PD arrays.

We experimentally demonstrate space-code-division multiple access (space-CDMA) based twodimensional (2-D) parallel optical interconnections by using image fibers and 8 x 8 vertical-cavity surface-emitting laser (VCSEL)/photo diode (PD) arrays. Two spatially encoded four-bit (2 x 2) parallel optical signals were emitted fiom 2-D VCSEL arrays and transmitted through image fibers. The encoded signals were multiplexed by an image-fiber coupler and detected by a 2-D PD array on the receiver side. The receiver recovered the intended parallel signal by decoding the signal. The transmission speed was 64 Mbps/ch (total throughput: 512 Mbps). Bit-error-rate (BER) measurement with a laterally misaligned PD array showed the array had a misalignment tolerance of 25 microm for a BER performance of 10(-9).

Two-dimensional erbium-doped image fiber amplifier (EDIFA)

Two-dimensional (2-D) erbium (Er)-doped image fiber amplifiers (EDIFAs) mere fabricated for the first time. The measured gain characteristics showed the applicability of optical amplifiers to 2-D high-throughput parallel optical data links. Additionally, we discuss pumping methods for the EDIFAs. Issues to achieve higher gain EDIFAs are addressed.