Low-power modular parallel photonic data links

Abstract

Many of the potential applications for parallel photonic data links could benefit from a bi-directional Optoelectronic Multi-Chip Module (OEMCM), where the optical transmitter, receiver, and first-level interface electronics are combined into a single package. It would be desirable for such a module to exhibit low power consumption, have a simple electronic interface that can operate at a variety of speeds, and possess a capability to use interchangeable optics for a variety of external connections. Here, we describe initial results for a parallel photonic link technology that exhibits those properties. This link uses high-efficiency, back-emitting, two-dimensional Vertical Cavity Surface-Emitting Laser (VCSEL) arrays operating at 980 nm. The lasers are matched, via integrated microlenses, to corresponding monolithically-integrated photoreceiver arrays that are constructed in a InGaAs/InP Heterojunction Bipolar Transistor (HBT) technology. In initial breadboard-level tests, the photonic data channels built with these devices have been demonstrated with direct (3.3 V) CMOS drive of the VCSELs and a corresponding CMOS interface at the photoreceiver outputs. These links have shown electrical power consumption as low as 42 mW per channel for a 50% average duty cycle while operating at 100 Mb/s