16 September 2003 Durham, NC Lightwave--ExceLight Communications, a U.S.-based unit of Sumitomo Electric Industries (SEI), is now shipping in production volumes small-form-factor pluggable (SFP) optical transceivers for coarse wavelength-division multiplexing (CWDM) applications. The transceivers are available in eight ITU-compliant CWDM wavelengths from 1470 nm to 1610 nm. Transceivers for eight additional wavelengths in the 1300-nm region will be available later this year. The devices include color coding by wavelength for easy identification.
Using SEI's high-performance, uncooled distributed-feedback lasers and optimum thermal design of devices and circuitry, the transceivers combine excellent transmission characteristics and low cost.
Supporting 1.25-Gbit/sec Gigabit Ethernet, 2.5-Gbit/sec STM-16/OC-48, and 2.7-Gbit/sec STM-16/OC-48 with forward error correction, the transceivers achieve transmission distances of 40 km with a PIN photodiode receiver or 80 km with an avalanche photodiode.
To ease application and operation, the transceivers include built-in digital diagnostic functions and operate from a single 3.3-Vdc supply. They comply fully with the SFP multisource agreement.
The new CWDM transceivers extend SEI's already broad line of SFP transceivers for data and telecommunications applications.
In producing the transceivers, SEI has been granted a license from Finisar Corp. for the following patents: U.S. 5,019,769 and U.S. 6,439,918.
