The effect of twisting and longitudinal strain on the wavelength response of taper coaxial coupler filters is examined. Both effects permit the fine-tuning of the wavelength response of the single fibre filters, but we demonstrate that a combination of twist and strain is preferred, as it is possible to eliminate residual birefringence present during the fabrication of such filters.
No takes yet. Share an insight, caveat, or question.
Boucouvalas et al. (1987) studied this question.