Multiwavelength Distributed Feed Back Laser Array Transmitters for Optical Network Technology Consortium Reconfigurable Optical Network Testbed.
Abstract
We discuss the design, fabrication, and performance of multiwavelength laser array transmitters that have been used in the reconfigurable optical network testbed for the Optical Network Technology Consortium (ONTC). The experimental 4-node multiwavelength network testbed is SONET/ATM compatible. It has employed multiwavelength DFB laser arrays with 4 nm wavelength spacing for the first time. The testbed has demonstrated that multiwavelength DFB laser arrays are indeed practical and reproducible. For the DFB laser arrays used in such a network the precise wavelength spacing in the array and the absolute wavelength control are the most challenging tasks. We have obtained wavelength accuracy better than + or - 0.35 nm for all lasers, with some registered to better than + or - 0.2 nm. We have also studied the array yield of our devices and used wavelength redundancy to improve the array yield. Coupling efficiencies between -2.1 to -4.5 dB for each wavelength channel have been obtained. It is achieved by using specially designed lensed fiber arrays placed on a silicon V-grooved substrate to exactly match the laser spacing. The transmitter consisted of a multichip module containing a DFB laser array, an 8-channel driver array based on GaAs ICs, and associated RF circuitry.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1996
- Accession Number
- ADA313759
Entities
People
- B. Pathak
- C. E. Zah
- R. Bhat
- T. P. Lee
- W. C. Young
Organizations
- United States Army Research Laboratory