No abstract

No abstract

No abstract

We report on tuning characteristics of an optical filter based on fibre-optic ring resonator (FORR), which exploits polarisation and birefringence effects in the resonance loop of the FORR. It is demonstrated that at some operational conditions imposed upon the FORR, the effects of polarisation and birefringence in the resonance loop can become an easy tool for tuning the filter response. In particular, we show that the filtering wavelength can be tuned in to a desired value by simultaneously varying the polarisation and birefringence in the loop fibre. In the case of no polarisation change and the birefringence variations by π rad, the filtering wavelength will not alter. The results of our analysis may be useful for designing optical filters used in various optical systems.

No abstract