Patent ID: 6836588
Filing Date: 2004-12-28
Classification: G02B,H04B,Y10S

Abstract:
A filter comprising:a first fiber having a first end and a second end; a second fiber having a first and a second end, the first and the second fibers fused together in a plurality of sections having coupling ratios such that an optical signal having multiple frequencies input to the first end of the first fiber is filtered into a first filtered signal including a first subset of the multiple frequencies at the second end of the first fiber and a second signal including a second subset of the multiple frequencies at the second end of the second fiber, the first signal having a chromatic dispersion caused by passing the first signal from the first end of the first fiber to the second end of the first fiber; a non-reciprocal optical element coupled between the second end of the first fiber and the second end of the second fiber, the non-reciprocal optical element to pass the first signal from the second end of the first fiber to the second end of the second fiber, wherein passing the first signal to the first end of the second fiber reduces the chromatic dispersion caused by passing the first signal from the first end of the first fiber to the second end of the first fiber.