Wavelength drop-and-insert device

Details Wavelength drop-and-insert device Wavelength drop-and-insert device

1989-12-22

1990-11-27

Healy, Brian

Multiplex communications

Wide area network

Packet switching

350 9616, 350 9619, 350401, 350402, 350404, 350311, 370 2, 370 3, 455606, 455612, 455616, G02B 626, G02B 634, H04J 1100, G02F 100

Patent

active

049731246

ABSTRACT:
The invention relates to an optical wavelength drop-and-insert device including two sets of input/output optical fibers attached to two terminals on each of a first and second polarization beam splitter. The first polarization beam splitter splits incoming light into two linearly orthogonal polarizations which are transmitted via a first and second polarization preserving fiber through a first and second quarter wave plate for changing the subject beams into circular polarization. An optical filter is included to transmit or reflect light from the quarter wave plates according to a wavelength based transmission/reflection characteristic. The second polarization beam splitter then acts as a combiner for the circularly polarized light which is received via a third and fourth polarization preserving fibers and then is transmitted via an output optical fiber. The second polarization beam splitter splits incoming light into two orthgonal polarizations via an incoming optical fiber for two way operation. A second embodiment of the invention uses a first and second optical filter which can be a Fabry Perot or Bragg diffraction grating type optical fiber.

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