Patent ID: 6266458
Filing Date: 2001-07-24
Classification: G02B

Abstract:
A tunable optical filtering system, comprising:a stabilization light source for supplying stabilization light;a first polarization beam splitter for polarizing said stabilization light and the input light to be filtered and generating polarized light;a first optical fiber node for connecting the output of said first polarization beam splitter with polarization maintaining fibers with the angle of 45 degrees between their birefringent axes and for splitting said polarized light;a plurality of polarization maintaining optical fibers for carrying said split light by said first optical fiber node;a phase modulator for maintaining phase difference between two birefringent axes of said polarization maintaining fibers;stabilization electronics for supplying a feedback signal to said phase modulator;a second optical fiber node for connecting said polarization maintaining fibers with the input of the second polarization beam splitter with the angle of 45 degrees between their birefringent axes, receiving split light by said first optical fiber node, and generating interference signals;a second polarization beam splitter for dividing said interference signals into output signals by the polarization axes; andtwo wavelength division optical multiplexers for dividing said output signals into signals for said stabilization electronics and filtered signals by wavelengths.