Optical fiber frequency filter and multiplexer using same

Details Optical fiber frequency filter and multiplexer using same Optical fiber frequency filter and multiplexer using same

1983-01-21

1987-10-27

Sikes, William L.

Multiplex communications

Wide area network

Packet switching

350 9615, 350 9629, 350311, 370 3, 370 4, G02B 628, H04B 900

Patent

active

047025506

ABSTRACT:
An optical frequency filter for selectively blocking or transmitting an amplitude-modulated optical signal. In a first embodiment of the invention, an optical coupler adds two optical inputs. The output of the optical coupler is delayed and attenuated and then applied to the input of an optical splitter. One output port of the optical splitter is applied to one input port of the optical coupler, with the optical signal to be filtered applied to the other input port of the coupler. The filtered output signal is produced at the second output port of the splitter. In a second embodiment, the delay and attenuation are performed between the output of the splitter and the input of the coupler. In a third embodiment, the signal to be filtered is applied to the input port of an optical splitter. One of the output ports of the splitter is coupled through a delay to one input port of an optical combiner, while the other output port of the splitter is delayed and coupled to the other input port of the coupler.

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Aoyama et al, "Optical Demultiplexer . . . System", Applied Optics, 4/79, vol. 18, No. 8, pp. 1253-1258.
Miyauchi et al, "Compact Wavelength . . . Pieces Optics Letters, 7/80, vol. 5, No. 7, pp. 321-322.

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