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In this paper, tuneable comb filter using single-mode fiber (SMF)has been proposed and theoretically studied its capability of tuning the output spectral spacing continuously by using the birefringence property of polarization maintaining fiber (PMF).The proposed filter consists of one QWP, one HWP, one SMF and one PMF segment . Depending on the dynamic settings of wavelength of the input signal, refractive index, and length of the fiber material the comb filter offers the continuous channel spacing tunability. Obtained output spectra are quite similar as calculated from equation. Channel spacing can be tuned at any desired value with the help of this comb filter. PMF based filter is very useful for long distance transmission.

Wavelength spacing tenable capability of optical comb filter using Polarization Maintaining Fiber