Monolithically Integrated WDM Transmitter for All Optical Fiber Communications

Period of Performance: 05/01/1996 - 10/31/1996


Phase 1 STTR

Recipient Firm

Sdl, Inc.
80 Rose Orchard Way
San Jose, CA 95134
Principal Investigator
Firm POC

Research Institution

Jet Propulsion Laboratory
4800 Oak Grove Drive
La Cañada Flintridge, CA 91011
Institution POC

Research Topics


Spectra Diode Laboratories (SDL), in collaboration with the Jet Propulsion Laboratory (JPL), will develop a monolithically integrated Wavelength Division Multiplexing (WDM) transmitter for all-optical, high-data rate telecommunications. The integrated devices will incorporate on a single chip e-beam written, multi element DFB lasers emitting at equally spaced wavelengths, and an integrated combiner. In Phase I, SDL will demonstrate the integrated passive combiner, the essential element of the monolithic WDM source, and JPL will demonstrate direct-write e-beam lighography with 1 A absolute pitch control, and essential point for high device yield. Phase II will result in the development of a packaged transmitter, capable of WDM transmission at the rate of 2.5 Gb/s per channel, single-mode fiber pigtailed, with driver electronics, thermoelectric cooling and optical isolator included in the package. WDM transmitters are one of the key components missing for the practical implementation of all-optical networks. The current solution consists in screening discrete DFB devices, using an external coupler and a fiber amplifier to recover from the coupler losses. This results in bulky, expensive transmitters. The monolithic integration will remedy this situation and provide a low-cost, compact, high output power solution for WDM network sources.