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Optical transmission system and optical transmission device

  • US 9,698,902 B2
  • Filed: 06/11/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 06/30/2014
  • Status: Active Grant
First Claim
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1. An optical transmission system comprising:

  • a first optical transmission device includinga wavelength selective switch (WSS) having a plurality of input ports and an output port, whereinthe plurality of input ports includeinput ports to receive channel lights, respectively, anda respective input port to receive measurement light generated by the first optical transmission device,the WSS is controllable to output the received measurement light from the output port, andthe first optical transmission device is configured to transmit light which includes at least the measurement light and is output from the output port of the WSS, to an optical transmission line that transmits the light which includes at least the measurement light in a first direction; and

    a second optical transmission device comprisinga first device which is an optical splitter or a WSS, and includesan input port to receive the light which includes at least the measurement light transmitted by the optical transmission line, anda plurality of output ports, anda second device which is an WSS including a plurality of input ports and an output port, whereinthe second optical transmission device provides a loop-back connection between a respective output port of the plurality of output ports of the first device and a respective input port of the plurality of input ports of the second device, so that the measurement light included in the light received by the input port of the first deviceis provided from the respective output port of the plurality of output ports of the first optical device to the respective input port of the plurality of input ports of the second device,then output from the output port of the second device, andthen transmitted by the second optical transmission device to the first optical transmission device through an optical transmission line that transmits light transmitted by the second optical transmission device in a second direction,so that the measurement light is thereby looped-back by the second optical transmission device to the first optical transmission device, andthe first optical transmission device receives the measurement light loop-backed by the second optical transmission device and is configured to measure an optical transmission characteristic between the first optical transmission device and the second optical transmission device in accordance with the received measurement light, wherein the measuring the optical transmission characteristic comprises at least one of;

    measuring an optical signal-to-noise ratio (OSNR) of the received measurement light, and measuring an OSNR between the first optical transmission device and the second optical transmission device in accordance with the measured OSNR of the received measurement light,measuring optical power variations of the received measurement light, and measuring a polarization dependent loss (PDL) between the first optical transmission device and the second optical transmission device in accordance with the measured optical power variations of the received measurement light,analyzing a polarized wave state of the received measurement light, and measuring a polarization mode dispersion (PMD) between the first optical transmission device and the second optical transmission device in accordance with the analyzed polarized wave state of the received measurement light, andanalyzing a wavelength dependence on a phase of the received measurement light, and measuring chromatic dispersion (CD) between the first optical transmission device and the second optical transmission device in accordance with the analyzed wavelength dependence on a phase of the received measurement light,wherein the measurement light is at a wavelength in a wavelength band that is a measurement target of the optical transmission characteristic.

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