Free space optical tap and multi/demultiplexer

Optical communications – Optical communication over freee space

Reexamination Certificate

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C398S083000, C398S048000, C359S015000

Reexamination Certificate

active

07116910

ABSTRACT:
A free space optical tap and multi/demultiplexer unit includes at least one optical unit that can tap off an optical signal from and/or add an input optical signal to a received FSO signal. The optical unit propagates the resulting optical signal, via free space, to a next optical unit of the system. The optical unit can include a holographic grating to diffract a portion of the received FSO signal to an optical detector and/or diffract an input optical signal to form part of a free space optical output signal. In addition, the FSO signal can include component signals of different wavelengths, with each optical unit of the system being wavelength specific to a different one of the wavelengths of the FSO signal.

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Palmer, C. “Diffraction Grating Handbook”, Table of Contents, Ch. 1, 2, 4, and 9, http://www.gratinglab.com/library/handbook4/handbook.asp, Nov. 30, 2001.

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