Abstract
The polarization sensitivity of a bidirectional fiber-optic modulator is passively eliminated by incorporating the modulator in an orthoconjugate loop mirror or in an in-line fiber loop. We describe and analyze these fiber loop configurations which allow remote interrogation of polarization-sensitive devices with either one or two conventional singlemode fibers. For bulk single-drive modulators, the polarization sensitivity is reduced to /spl plusmn/0.15 dB out to 2 GHz. By utilizing a balanced, dual-drive feed to a bidirectional traveling-wave modulator, residual polarization sensitivity of /spl plusmn/2 dB is demonstrated for ultrawideband operation to 25 GHz and /spl plusmn/0.3 dB for narrowbands.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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