photonic components, modules and subsytems for wavelength signal routing, monitoring and conditioning, namely, lasers, light waveguides, light filters and modulators, electro-optical waveguides, fiberoptic light switches and fiberoptic light amplifiers; photonic components and subsystems for wavelength management and control in wavelength division multiplexed (WDM) and dense wavelength division multiplexed (DWDM) optical networks, namely, modules, electronic circuits and computer software for the purpose of wavelength management and control; dynamic wavelength channel switches and routers; diffraction gratings; bragg gratings; grating-based modules for wavelength referencing; grating-based sensor networks; grating-based sensors; fiber optic sensors; devices for monitoring optical wavelengths; devices for monitoring optical signals; fiber optic sources; optical sources; demultiplexers; optical connectors; optical couplers; optical switches; optical transmitters; optical receivers; optical filters; computer programs, software and firmware for optical network diagnostics; computer programs, software and firmware for use in signal routing, control, monitoring and conditioning; and computer programs, software and firmware for use in wavelength management and control