Abstract
The recent availability of DPSK demodulators has spurred interest in phase-modulated analogue RF photonic links, but phase shifts due to birefringence can cause transmission impairments. Presented are measurements of the polarisation-dependent phase shift in a DPSK demodulator created by the relative angle (in Stokes space) between the launch SOP and the demodulator's eigenstate. This phase shift is connected to earlier theoretical predictions, and results are compared to a vendor's specifications for three models. Since imperfect phase modulators may cause modulation of the polarisation at the signal frequency, these impairments may limit RF photonic link performance.
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