Patent ID: 6343170
Filing Date: 2002-01-29
Classification: G01J,G02B

Abstract:
An optical spectrum analyzer comprising:(a) at least one volume phase grating; (b) a first reflector; (c) a second reflector; (d) a first transparent block; and (e) a second transparent block; said first and second reflectors being in a fixed spatial relationship with said at least one volume phase grating, so that light entering the optical spectrum analyzer is reflected by said first reflector towards said at least one volume phase grating, said reflected light is diffracted towards said second reflector while traversing said at least one volume phase grating, and said once-diffracted light is reflected back by said second reflector towards said at least one volume phase grating and is again diffracted towards said first reflector while again traversing said at least one volume phase grating; said at least one volume phase grating being optically coupled to said first and second blocks, said first reflector being a reflective surface of said first block, said second reflector being a reflective surface of said second block.