Optical add-drop multiplexer using optical circulators and photo

Details Optical add-drop multiplexer using optical circulators and photo Optical add-drop multiplexer using optical circulators and photo

1996-02-21

1998-03-10

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04J 1402

Patent

active

057267855

ABSTRACT:
This multiplexer adds to a group of optical signals, whose wavelengths belong to a group of wavelengths (.lambda.1 . . . .lambda.N) and drop from said group of signals at least one optical signal having a given wavelength, chosen from within the wavelength group and comprises at least one optical circulator (C1, C2) having an input for receiving the group of signals and an output, an optical selection means (MS) coupled, on one side, to the circulator and which comprises at least one photoinduced Bragg grating (R1 . . . RN), said photoinduced Bragg grating being associated with the given wavelength and which can be in a first state, where it reflects the signal having said given wavelength and where it transits signals having a wavelength different from the given wavelength or optionally in a second state where it transmits all the signals, and a means (MC) for the control of said selection means (MS) for placing the grating in said second state, the selection means cooperating with each optical circulator for adding and dropping the optical signal or signals. Application to optical telecommunications.

REFERENCES:
patent: 4953939 (1990-09-01), Epworth
patent: 5479082 (1995-12-01), Calvani et al.
patent: 5557442 (1996-09-01), Huber
Jones et al, "Optical wavelength add-drop multiplexer in installed submarine WDM network", Electronic Letters, vol. 31, No. 24, pp. 2117-2118, Nov. 1995.
Giles et al, "Low Loss Add/Drop multiplexer for WDM Lightwave Networks", Conference on Integrated Optics an Optical Fibre Communication, Technical Digest, pp. 66-67, Jun. 1995.
Kersey, "Spectrally Selective Fiber transmission Filter System", Licensing offer, received Jul. 1994, US patent application 154419, Jul. 1994.

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