3 results about "Wdm transmission systems" patented technology

The present disclosure relates to multi-channel optical transmitters and apparatuses in WDM transmission systems. A GT etalon-based dispersion compensator is disclosed that can be utilized in combination with a wavelength division multiplexer at the transmitter location to provide a degree of pre-compensation for signals operating at wavelengths known to experience dispersion between the transmitter and receiver locations. The GT etalon-based dispersion compensator utilizes a separate dispersion compensator configured as a transmissive device by using a polarization beam splitter, a GT etalon, and a pair of quarter-wave plates in a manner such that the output signal path remains collinear with the input signal path and also preserves the linear polarization state of the propagating signal. Multiple of these transmissive dispersion compensators can be cascaded in a back-to-back arrangement within the signal path of a particular channel to provide a greater degree of pre-compensation for wavelengths known to be more susceptible to dispersion compensation.

An optical transmission design device (100) disclosed herein comprises: a noise characteristic information acquisition unit (110) that acquires noise characteristic information of an optical transmission device; an OSNR deterioration amount calculation unit (120) that uses the noise characteristic information, acquired by the noise characteristic information acquisition unit (110), to calculate the amount of optical signal-to-noise ratio deterioration that occurs when an optical signal passes through the optical transmission device; a nonlinear waveform distortion calculation unit (130) that calculates the nonlinear waveform distortion of an optical transmission path; and a transmission reachability evaluation unit (140) that compares a value obtained by subtracting the nonlinear waveform distortion from the amount of optical signal-to-noise ratio deterioration calculated by the OSNR deterioration amount calculation unit (120) with the performance of a single optical transmission / reception device (30) to evaluate the transmission reachability of a wavelength multiplex transmission system (1000).

A method and an apparatus for controlling an optical fiber amplifier, a system, a transmission node and a storage medium. WDM transmission systems are deployed between a first communication end and a second communication end. At least one target WDM transmission system includes a first transmission node and a second transmission node. The first transmission node receives a first control signal including an identifier of the second transmission node, and switches on a transmit-end optical fiber amplifier of the first transmission node if determining that the first control signal is a normal control signal and the second transmission node identifier matches a pre-stored first reference node identifier. The second transmission node receives a second control signal including an identifier of the first transmission node, and performs a similar judgment to switch on a transmit-end optical fiber amplifier of the second transmission node.