(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2004/0120720 Al
Chang et al. (43) Pub. Date: Jun. 24,2004
(54) FIBER OPTIC TRANSCEIVER WITH VCSEL SOURCE
(76) Inventors: Chin L. Chang, Walnut, CA (US);
Amado Cordova, Venice, CA (US)
Elliott N. Kramsky, Esq.
5850 Canoga Avenue
Woodland Hills, CA 91367 (US)
(21) Appl. No.: 10/329,225
(22) Filed: Dec. 24, 2002
Publication Classification (51) Int. CI.7 H04B 10 00
A fiber optic transceiver includes a VCSEL light source. The transceiver is adapted to communicate with existing LEDbased transceivers to enable external electronic circuits to interact. The transceiver ol the invention includes an InGaAs photodetector for receiving 1310 nm signals emitted from the LED light source of an existing transceiver. The existing transceiver typically includes an InGaAs photodetector characterized by distinct responsivities at 850 nm and at 1310 nm. This enables signals transmitted at 850 nm from the VCSEL light source of the transceiver to be detected by an existing LED-based transceiver, while the InGaAs photodetector of the transceiver of the invention is capable of receiving signals emitted from the LED light source.