Free-space micro-mirror wavelength add/drop multiplexers with full connectivity for two-fiber ring networks

A wavelength add/drop multiplexer comprising:

• a first demultiplexer coupled to a first input port for generating a first set of demultiplexed input signals from a first wavelength division multiplexed signal received at the first input port;
• a first multiplexer coupled to a first output port for generating a first output wavelength division multiplexed signal for transmission to the first output port;
• a second demultiplexer coupled to a second input port for generating a second set of demultiplexed signals from a second wavelength division multiplexed signal received at the second input port;
• a second multiplexer coupled to a second output port for generating a second output wavelength division multiplexed signal for transmission to the second output port;
• a third demultiplexer for demultiplexing a wavelength division multiplexed signal received from a local access port;
• a third multiplexer for multiplexing a plurality of signals for transmission to a local access port;
• a reconfigurable switching matrix comprising a plurality of free-space micromirrors, each of the micromirrors placed selectively in one of an actuated or a non-actuated state.

An unidirectional two-fiber optical network comprising:

• a service fiber route;
• a protection fiber route;
• at least one wavelength add/drop multiplexer, wherein each of the wavelength add/drop multiplexer divides the service fiber route and the protection fiber route into a plurality of segments, wherein each of the wavelength add/drop multiplexers comprises:
• a first input port coupled to a first segment of the service fiber route;
• a first output port coupled to a second segment of the service fiber route;
• a second input port coupled to a first segment of the protection fiber route;
• a second output port coupled to a second segment of the protection fiber route;
• a first demultiplexer coupled to the first input port for generating a first set of demultiplexed input signals from a first wavelength division multiplexed signal received at the first input port;
• a first multiplexer coupled to the first output port for generating a first output wavelength division multiplexed signal for transmission to the first output port;
• a second demultiplexer coupled to the second input port for generating a second set of demultiplexed signals from a second wavelength division multiplexed signal received at the second input port;
• a second multiplexer coupled to a second output port for generating a second output wavelength division multiplexed signal for transmission to the second output port;
• a third demultiplexer for demultiplexing a wavelength division multiplexed signal received from a local access port;
• a third multiplexer for multiplexing a plurality of signals for transmission to a local access port;
• a reconfigurable switching matrix comprising a plurality of free-space micromirrors, each of the micromirrors placed selectively in one of an actuated or a non-actuated state.

An bidirectional two-fiber optical network comprising:

• a first service/protection fiber route;
• a second service/protection fiber route;
• at least one wavelength add/drop multiplexer, wherein each of the wavelength add/drop multiplexer divides the first and second service/protection fiber routes into a plurality of segments, wherein each of the wavelength add/drop multiplexers comprises:
• a first input port coupled to a first segment of the first service/protection fiber route;
• a first output port coupled to a second segment of the first service/protection fiber route;
• a second input port coupled to a first segment of the second service/protection fiber route;
• a second output port coupled to a second segment of the second service/protection fiber route;
• a first demultiplexer coupled to the first input port for generating a first set of demultiplexed input signals from a first wavelength division multiplexed signal received at the first input port;
• a first multiplexer coupled to the first output port for generating a first output wavelength division multiplexed signal for transmission to the first output port;
• a second demultiplexer coupled to the second input port for generating a second set of demultiplexed signals from a second wavelength division multiplexed signal received at the second input port;
• a second multiplexer coupled to a second output port for generating a second output wavelength division multiplexed signal for transmission to the second output port;
• a third demultiplexer for demultiplexing a wavelength division multiplexed signal received from a local access port;
• a third multiplexer for multiplexing a plurality of signals for transmission to a local access port;
• a reconfigurable switching matrix comprising a plurality of free-space micromirrors, each of the micromirrors placed selectively in one of an actuated or a non-actuated state.