Patent ID: 6624939
Filing Date: 2003-09-23
Classification: G02B,H04J

Abstract:
An optical de-interleaver comprising:a first port for introducing an input beam of odd-odd, odd-even, even-odd and even-even channel signals having channel spacing S and providing two linearly polarized beams of odd-odd, odd-even, even-odd and even-even channel signals with same polarizations; a second port; a third port; a fourth port; a fifth port; an optical dispersion compensator; a first polarization beam splitter reflecting said two linearly polarized beams of odd-odd, odd-even, even-odd and even-even channel signals to said optical dispersion compensator; a first polarization interferometer; a second polarization interferometer; a third polarization interferometer; a second polarization beam splitter, said two linearly polarized beams of odd-odd, odd-even, even-odd and even-even channel signals going through said optical dispersion compensator, passing through said first polarization beam splitter and said second polarization beam splitter, and then going through said first polarization interferometer and being split by said second polarization beam splitter into two linearly polarized beams of odd-odd and odd-even channel signals having channel spacing 2S and two linearly polarized beams of even-odd and even-even channel signals having channel spacing 2S; a first reflector, said two linearly polarized beams of odd-odd and odd-even channel signals being reflected by said first polarization beam splitter and said first reflector, being reflected by said first polarization beam splitter again and passing through said second polarization beam splitter and going through said first polarization interferometer again, and then being reflected by said second polarization beam splitter, going through said second polarization interferometer; a second reflector, said two linearly polarized beams of even-odd and even-even channel signals being reflected by said second polarization beam splitter and said second reflector, being reflected by said second polarization beam splitter again, going through said first polarization interferometer again, passing through said second polarization beam splitter, and then being reflected by said first polarization beam splitter, and going through said third polarization interferometer; a third polarization beam splitter splitting said two linearly polarized beams of odd-odd and odd-even channel signals after going through said second polarization interferometer into two linearly polarized beams of odd-odd channel signals and light beams of odd-even channel signals, said two linearly polarized beams of odd-odd channel signals passing through said second polarization beam splitter and being received by said second port to provide a first output beam of odd-odd channel signals having channel spacing 4S, and said two linearly polarized beams of odd-even channel signals being received by said third port to provide a second output beam of odd-even channel signals having channel spacing 4S; and a fourth polarization beam splitter splitting said two linearly polarized beams of even-old and even-even channel signals after going through said third polarization interferometer into two linearly polarized beams of even-old channel signals and two linearly polarized beams of even-even channel signals, said two linearly polarized beams of even-old channel signals passing through said first polarization beam splitter and received by said third port to provide a third output beam of even-old channel signals having channel spacing 4S, said two linearly polarized beams of even-even channel signals being received by said fifth port to provide a fourth output beam of even-even channel signals having channel spacing 4S.