Patent ID: 7289544

Claim:
A light-emitting module comprising: a semiconductor light-emitting device for emitting light with a predetermined magnitude under a predetermined temperature, said light-emitting device having a first facet and a second facet; an etalon device optically coupling to said second facet of said semiconductor light-emitting device; a first optical detector for outputting a first output, said first optical detector being optically coupled with said semiconductor light-emitting device without coupling to said etalon device; and a second optical detector for outputting a second output, said second optical detector being optically coupled with said semiconductor light-emitting device through said etalon device, wherein said first optical detector is disposed between said semiconductor light-emitting device and said etalon device such that said first optical detector receives said light emitted from said light-emitting device without said light having been split before being received by said first optical detector.