Optical add-drop multiplexers compatible with very dense WDM opt

Details Optical add-drop multiplexers compatible with very dense WDM opt Optical add-drop multiplexers compatible with very dense WDM opt

1997-04-25

1999-11-09

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

385 24, H04J 1402

Patent

active

059825189

ABSTRACT:
The present invention provides add-drop multiplexers which are compatible with dense wavelength division multiplexed (WDM) systems having large numbers of optical channels. The add-drop multiplexers employ sets of Bragg gratings separated by an optical isolator to reliably add or drop optical channels without crosstalk. The Bragg grating sets and the optical isolator are interposed between first and second optical couplers. Optical channels to be dropped from a WDM optical signal are reflected by the first set of Bragg gratings and exit the add-drop multiplexer through the first coupler. Optical channels to be added to a WDM optical signal enter the add-drop multiplexer through the second optical coupler.

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Taverner, D., et al., "Dispersion compensation of 16ps pulses over 100km of step-index fibre using cascaded chirped fibre gratings," Electronics Letters, Jun. 8.sup.th, 1995, vol. 31, No. 12, pp. 1004-1005.
Copy of PCT--International Search Report and Notification of Transmittal of the International Search Report or the Declaration, Aug. 6. 1998 (7 pages total).
Chawki, M.J. et al., "Evaluation of an Optical Boosted Add/Drop Multiplexer OBADM including circulators and fiber grating fibers," Proceedings of the European Conference on Optical Communication, vol. 1, Sep. 17, 1995, pp. 47-50.

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