Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-02-13
1997-02-04
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359124, 359341, 359634, 359114, H04J 1402, H01S 300
Patent
active
056004680
ABSTRACT:
The apparatus extracts from an optical transmission path bidirectionally-propagating groups of wavelength-division multiplexed optical signals, arranges the groups to propagate unidirectionally via an output port, receives a corresponding unidirectional group via an input port, sorts the corresponding unidirectional group into two groups corresponding to those extracted from the transmission path, and returns the two corresponding groups of wavelength-division multiplexed signals to the transmission path so that each group propagates in its original direction. The apparatus comprises first and second bidirectional ports for coupling in series between first and second sections of the transmission path, and a series of optical devices each comprising first, second, third and fourth ports and an optical bandpass filter or other wavelength-selective element. Each of the filters selects a different wavelength. Each device couples optical signals of its selected wavelength entering its first port to emerge from its fourth port, and vice versa; couples optical signals of its selected wavelength entering its second port to emerge from its third port, and vice versa; couples optical signals of other than its selected wavelength entering its first port to emerge via its second port, and vice versa; and couples optical signals of other than its selected wavelength entering its third port to emerge via its fourth port, and vice versa. A first in the series of optical devices has its first and third ports coupled to the bidirectional ports, respectively, for connection to the transmission path, and its second and fourth ports connected to the first and third ports, respectively, of a succeeding one of the series of optical devices. A last in the series of optical devices has its first and third ports connected to the second and fourth ports, respectively, of a preceding one of the series of optical devices, and its second and fourth ports serving for unidirectional output and input ports, respectively, of the apparatus. Any intervening device has its first and third ports connected to the second and fourth ports of the preceding device.
REFERENCES:
patent: 5050952 (1991-09-01), Fussgager
patent: 5295011 (1994-03-01), Heise
patent: 5452124 (1995-09-01), Baker
Boudreau Leo
JDS Fitel Inc.
Mehta Bhavesh
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