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Technique for monitoring optical paths
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Method and apparatus for suppression of noise due to transmitted signal instability in a coherent fiber optical sensor system
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Method and apparatus for suppression of noise due to local oscillator instability in a coherent fiber optical sensor
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Technique for monitoring optical paths
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Symmetrical supervisory optical circuit for a bidirectional optical repeater
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Optical network elements
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Monitoring equipment for an optical transport system
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Communication system employing self-tuning optical transceivers
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Use of band-pass filters in supervisory signal paths of an optical transport system
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Transmission system having a trunk and a branch
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Submarine communication cable and method for identifying an optical fiber
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Automatic paths discovery in an optical network
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Supervisory signal paths for an optical transport system
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Longitudinal sealed welding wire for metal tube
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Facility for carrying signals via optical conductors including a system for monitoring repeaters
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Method for obtaining a length of optical fibers in a metal protection tube and implementation line
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Soliton format data optical transmission system
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Receiver for optical digital signal transmission system
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Terminal for a secure bidirectional link conducting multiplexed data according to the synchronous digital hierarchy
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Optical communication system with optical amplifiers whose gain depends on polarization of the input signal
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