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Telecommunication fiber optic systems, namely, optical circuits and devices for use in metro access, namely, direct modulated lasers, semiconductor lasers, laser transmitter modules, [ continuous wave lasers, ] directly modulated lasers, light emitting diodes, laser diodes, solid-state lasers, optical signal converters, receiver modules, receiver modules with clock or data recovery circuits, video-on-demand modules; [ photodetectors, photodiodes, ] transceivers, transponders, multiplexers, dense wavelength division multiplex couplers, coarse wavelength division multiplex couplers, wideband couplers, add-drop multiplexers, fiber optic modems, optical gratings, multiple channel optical interface units, access couplers, [ attenuators, emulators, ] filters, active couplers, interferometer components, namely, photodetectors and photodiodes, isolators, waveguides, polarization components, namely, [ optical attenuators, modulators, ] erbium-doped fiber amplifiers, [ pump lasers, ] fiber optic extenders, [ link enclosures, ] amplifiers modules, optical fiber amplifier components, namely, [ circuit boards, ] optical amplifiers, [ electrical amplifiers, integrated circuits, pump lasers and lasers not for medical use, optical switches, microelectronic mechanical switches, optical patch cords, jumper cables; single mode fibers; multi mode fibers; fiber optic transceivers; fiber optic transmitters; fiber optic receivers, parallel optical interface; ] optical equipment, namely, [ lasers, ] fiber optic transmitters, [ semiconductor lasers, laser transmitter modules, continuous wave lasers, directly modulated lasers, light emitting diodes, laser diodes, solid-state lasers, ] optical terminations, optical signal converters, receiver modules, receiver modules with clock or data recovery circuits, high gain optical/electrical receivers and converters, [ photodetectors, photodiodes, ] transceivers, transponders, multiplexers, dense wavelength division multiplex couplers, coarse wavelength division multiplex couplers, wideband couplers, add-drop multiplexers, [ fiber optic modems, ] optical gratings, multiple channel optical interface units, access couplers, [ attenuators, emulators, ] filters, active couplers, interferometer components, namely, [ photodetectors and photodiodes, isolators, waveguides, polarization components, namely, optical attenuators, modulators, wavelength lockers, erbium-doped fiber amplifiers, pump lasers, ] fiber optic extenders, link enclosures, fiber optic regenerator modules, [ amplifiers modules, optical fiber amplifier components, namely, circuit boards, optical amplifiers, electrical amplifiers, integrated circuits, pump lasers and lasers not for medical use, optical switches, microelectronic mechanical switches, optical patch cords, jumper cables; ] fiber optic switches, path protection, namely, transponders, equipment protection, namely, optical splitters, micro-electro-mechanical switches; fiber optic regenerators for use in telecommunications and data communications systems; signal boosters, namely, [ optical and electrical amplifiers; ] optical couplers for use in telecommunication and data communication systems; bi-directional transponders and amplifiers; unidirectional transponders and amplifiers; optical wave guides; fiber optic demultiplexers and multiplexers for course wavelength division multiplexing; fiber optic demultiplexers and multiplexers for dense wavelength division multiplexing; amplifiers; [ electro-optic components for wavelength termination, namely, receiver modules, receiver modules with clock or data recovery circuits, high gain optical/electrical receivers and converters, photodetectors, photodiodes, transceivers, transponders, multiplexers, add-drop multiplexers, multiple channel optical interface units, access couplers, emulators, modulators; ] telecommunications and fiber optics, namely, computer software for management, control, monitoring, and fault detection for telecommunications and fiber optic systems