Abstract
Optical fibre rocking filters are structures that rotate the polarisation state of an optical field in a biréfringent fibre. This is achieved by periodically rocking the principal axes of the fibre through a small “rocking angle” θ, at a period equal to the beat length. Since the biréfringent beat length is wavelength dependent, there is a resonant wavelength, at which the beat length equals the rocking period. Here, complete coupling between polarisation states is possible whereas at other wavelengths, only partial coupling occurs. At resonance, the state of polarisation is rotated by an angle 2θ per period and thus for complete power transfer, π/4θ coupling steps are required [1].
© 1996 Optical Society of America
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