Patent ID: 6936805
Filing Date: 2005-08-30
Classification: G02B

Abstract:
1. A device for fixing an optical wavelength in a wavelength division multiplexing system, comprising: a light source; a filter device coupled to said light source for passing a predetermined wavelength there through, said wavelength existing in the spectrum of light emitted by said light source, said filter device including: a fixation unit fixed to a substrate; a rotation unit having a filter and being rotatably installed on said fixation unit; and, a control means for obtaining a predetermined wavelength by rotating said rotation unit installed on said fixation unit to a predetermined angle; a photodiode for sensing said wavelength passing through said filter device and generating a corresponding electrical signal; and, a laser diode controller for driving said light source by comparing said electrical signals generated by said photodiode with the signals emitted by said light source and for outputting a control signal to the light source according to the comparison result, wherein the control means controls a rotation angle through gear combinations of gears having planarly meshed teeth, said combinations corresponding to relative positions of said fixation unit to said rotation unit.