Abstract: A method for packet processing for data transmission over an optical fiber, the method including the steps of segmenting an incoming bit stream, adding a tag to a header of each segment, each tag including data identifying a route between a source and a destination end-point of the bit stream, encapsulating the tagged segment into a Point-to-Point Protocol (PPP) packet, and mapping the encapsulated packet into a transmission frame (SONET/SDH or other) for transmission over an optical fiber.

Abstract: An expandable multiplexer and method for adding additional channels per fiber in an optical communication system, the multiplexer including a wavelength multiplexer including at least two multiplexer input ports for combining a plurality of input wavelengths onto at least one multiplexer output port, and at least one wavelength filter including at least two filter input ports for combining at least two selected wavelengths onto at least one filter output port coupled to one of the multiplexer input ports.

Abstract: A device and method for monitoring and controlling the wavelength of a semiconductor laser having an adjustable wavelength, the device including a wavelength filter including a medium-dense wavelength division demultiplexer (WDM) arranged to receive a portion of the laser power of the laser and divide it between two filter outputs, a photoreceiver arranged to measure the output power at each filter output, a processor coupled to the photoreceivers and arranged to compute the ratio of power at the two filter outputs, apparatus to compare the computed ratio with a predetermined reference ratio, and apparatus to adjust the wavelength of the laser in response to the comparison.

Abstract: Apparatus for simultaneously monitoring and controlling the wavelength of a plurality of semiconductor lasers whose wavelengths can be adjusted, the device including a wavelength filter including a wavelength division demultiplexer (WDM) arranged to receive a portion of the output power of each laser and divide the laser output between two filter outputs, a photoreceiver arranged to measure the power at each filter output, a processor arranged to selectably compute the ratio of the power at the two filter outputs for each laser, apparatus to compare the computed ratio with a predetermined reference ratio for the selected laser, and apparatus to adjust the wavelength of the selected laser in response to the comparison.