Numerous user laser communications optical system using...

Details Numerous user laser communications optical system using... Numerous user laser communications optical system using...

2005-09-28

2010-02-23

Bello, Agustin (Department: 2613)

Optical communications

Receiver

Heterodyne

C398S207000, C398S212000, C398S152000, C398S118000

Reexamination Certificate

active

07668468

ABSTRACT:
The present invention relates to a numerous user laser communications optical system. Numerous optical signals comprising a number of channels are simultaneously received and demultiplexed (and/or multiplexed and transmitted) at a numerous access communication device. The numerous access communication device may comprise multiple stages that each include a multiple order waveplate and a polarizing beam splitter. The multiple order waveplate is configured so that it retards a first electrical field component of signals corresponding to certain channels in a frequency grid in an integer multiple of wavelengths with respect to a second electrical field component, and retards a first electrical field component of signals corresponding to other channels in the frequency grid in an integer multiple of wavelengths plus one-half a wavelength with respect to a second electrical field component. Separation can then be performed on the basis of the resulting opposite polarization.

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