Bi-directional configurable optical add/drop circuit

Details Bi-directional configurable optical add/drop circuit Bi-directional configurable optical add/drop circuit

H - Electricity

04

J

H04J 14/02 (2006.01) H04B 10/213 (2006.01) H04B 10/24 (2006.01) H04J 3/16 (2006.01)

Patent

CA 2260687

The present invention relates to a bi-directional configurable optical add/drop circuit. A symmetrical arrangement of serially coupled wavelength specific filters which include central add and drop ports isolated in both directions by filters provides a bi-directional circuit. Add and drop ports are coupled by a reflecting means, such as movable mirrors, or a movable double sided mirror. Alternatively, redirecting means comprise an opto-electronic, or other means, for providing a selectively reflective or transmissive interface. The reflecting means has a first position to direct a channel passed through a first filter to the drop port. If a new channel is added, the reflecting means couples the new channel through a second filter to the output port. In a second position, the reflecting means is moved from the beam path, permitting the channel to pass through the circuit without being dropped. In this way selected channels can be dropped, while others are allowed to pass. The reflecting means may be rotated or a second redirecting means substituted to reconfigure the circuit for signals propagating in the reverse direction to provide bi-directional coupling to the drop receiver and add transmitter. By applying absorption material to the surface of the reflecting means, an attenuation function can be added to the add/drop circuit. The configuration can be modified in operation. Numerous add/drop circuits can be arranged in parallel to address a large number of channels. A number of broad band filters first separate and direct selected channels to each add/drop circuit.

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