Formed in January 1995, WEST is a DARPA-supported consortium investigating technologies for implementing add-drop and cross-connect switches operating at 10 Gbit/s. Using wavelength division multiplexing (WDM), each fiber supports 40 Gbit/s (4 by 10 Gbit/s) aggregate bandwidth for SONET/SDH operation. Consortium members include Rockwell Corporation, Ortel Corporation, UCSB, UCSD, UCLA, and Caltech/JPL.
Wide temperature Distributed-Feedback (DFB) lasers will enable cost-effective high dynamic range fiber optic links for military and commercial applications, including military shipboard antenna remoting, phased array radar, wireless communications and broadband interactive networks. By eliminating the need for thermoelectric cooling, systems will benefit from lower power consumption, cost and complexity. In this paper, we present designs for wide temperature DFB lasers and single-mode performance from -15 degree(s)C to 85 degree(s)C.
This paper describes the digital laser and WDM laser array development at Ortel. First, we optimized the individual laser performance, and then studied the possibility of array integration. The issues of yield, cross-talk and packaging of laser array will be discussed.
We report a substantial link budget improvement by biasing a DFB laser high above threshold. We demonstrate directly modulated 10 Gb/s transmission at 1550 nm over 80 km of standard single mode fiber. Our numerical simulations agree well with experimental results.