| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tunable LED module which can more easily select a wavelength and reduce particular parts than heretofore. <P>SOLUTION: For example, the tunable LED module is applicable to a certain short range communication such as communication within a vehicle, LAN or the like. The module comprises: an LED 1 capable of emitting light with a certain wavelength band including a desire wavelength; a collimator 2 for collimating divergent light from the LED 1; an etalon 3 working as a wavelength selector for selecting light with a plurality of wavelengths including a desired wavelength from the light emitted from the LED 1; a BRF 4 working as an optical tuner which can selectively tune the desired wavelength within the wavelengths selected by the wavelength selector; an optical coupler 5 which the light rejected by the BRF 4 enters and coupled with; a LED mounting element 6 formed of a material with high thermal conductivity such as copper, a copper alloy and the like, the element for mounting the LED 1; and an optical receiver 7 for detecting the power of the light with wavelengths excluding the wavelength tuned by the BRF 4 and then generating a light level monitor signal representing the power of the detected light. <P>COPYRIGHT: (C)2009,JPO&INPIT |
