Low-loss asymmetrical single-mode fiber wavelength-selective directional couplers are fabricated at low cost. Proper control of the remaining cladding thickness and the interaction length of the half-couplers produces exactly the required bandwidth and center wavelength of the filter. Increasing the interaction length reduces the bandwidth and the sidelobes. Calculated values show good agreement with the experimental results.
© 1994 Optical Society of America
Original Manuscript: January 31, 1994
Published: June 1, 1994
Alok K. Das and Mehabub A. Mondal, "Precise control of the center wavelength and bandwidth of wavelength-selective single-mode fiber couplers," Opt. Lett. 19, 795-797 (1994)