Patent ID: 6937798
Filing Date: 2005-08-30
Classification: G01J,G02B

Abstract:
1. A device, comprising: an input fiber to receive input light; an output fiber; a first fiber; a second fiber; a fiber coupler having a first port coupled to said input fiber and said output fiber, and a second port coupled to said first and said second fibers to split said input light into a first beam in said first fiber and a second beam in said second fiber and to mix and couple optical signals from said first and said second fibers into said output fiber; a first reflector coupled to said first fiber to reflect said first beam back to said fiber coupler; a second reflector coupled to said second fiber to reflect said second beam back to said fiber coupler; a fiber tuning mechanism coupled to at least one of said first and said second fibers to change a relative delay in said first and said beams upon reflection to back said fiber coupler; an optical detector coupled to receive light from said output fiber to produce a detector output having information on optical interference between said first and said second beams received at said fiber coupler; an analog-to-digital converter coupled to convert said detector output into a digital signal; and a processing device receiving and performing a FFT processing on said digital signal to extract spectral information in said input light.