Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-09-29
2000-10-10
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359124, 359130, 385 24, H04J 1402
Patent
active
061307653
ABSTRACT:
A drop/insert apparatus for dropping/inserting channels on a both-way multi-channel optical link includes a "line" optical fiber serving to convey optical signals in two opposite transmission directions, over at least two channels having distinct wavelengths per transmission direction. The apparatus comprises: two main circulators inserted in said line fiber [two of the ports of each of them are connected to said line fiber, and their third ports are connected respectively to a first auxiliary optical fiber and to a second auxiliary optical fiber], each main circulator causing the optical signals to rotate in a rotation direction such that the signals propagating along said line fiber in one of the transmission directions remain in the line fiber; and, two auxiliary circulators inserted respectively in said first auxiliary fiber and in said second auxiliary fiber, each of said auxiliary circulators causing the optical signals to rotate in a direction opposite to that of the main circulator to which it is connected directly by one of said auxiliary fibers. At least one diffraction grating, having a reflection wavelength corresponding to the wavelength of a channel to be dropped in the go direction, is inserted in the line fiber between the main circulators, and at least one diffraction grating, having a reflection wavelength corresponding to the wavelength of a channel to be dropped in the return direction, is inserted in the by-pass fiber between the auxiliary circulators.
REFERENCES:
patent: 5633741 (1997-05-01), Giles
patent: 5742416 (1998-04-01), Mizrahi
Chawki et al, "Evaluation of an Optical Boosted Add/Drop Multiplexer OBADM Including Circulators and Fiber Grating Filters", 21st European Conference on Optical Communications ECOC 95, vol. 1, 17-21 Sep. 1995, pp. 47-50 XP002032556.
K. P. Jones et al, "Optical Wavelength Add-Drop Multiplexer in Installed Submarine WDM Network" Electronics Letters, vol. 31, No. 24, Nov. 23, 1995, p. 2117/2118 XP000548194.
Gautheron Olivier
Letellier Vincent
Alcatel
Negash Kinfe-Michael
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