| 摘要 |
<p>A coherent lightwave demodulator is disclosed which is insensitive to the polarization state ( beta ) of the incoming message signal. The demodulator includes a pair of optical hybrids (12,14) aligned to the polarization state of the local oscillator and a pair of optical balanced receivers (16,24). A squaring arrangement, for example a delay demodulator (30), responsive to the output from the pair of optical balanced receivers eliminates the polarization-dependent component of the message signal and allows the recovery of the message signal regardless of the polarization state of the incoming message signal.</p> |
