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Secured fiber link system

  • US 10,284,288 B2
  • Filed: 02/17/2017
  • Issued: 05/07/2019
  • Est. Priority Date: 02/18/2016
  • Status: Active Grant
First Claim
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1. A secured fiber link system, comprising:

  • a spatially multiplexing optical fiber;

    a transmit spatial multiplexer configured to couple each of a plurality of optical signals into a respective one of a plurality of distinct spatial paths of the spatially multiplexing optical fiber, each of the spatial paths being able to carry an optical signal;

    at least one optically modulated transmit source coupled to the transmit spatial multiplexer so that an optically modulated signal supplied as an output from the at least one optically modulated transmit source is coupled by the transmit spatial multiplexer into one of the plurality of spatial paths of the spatially multiplexing optical fiber;

    at least one optically modulated chaff source coupled to the transmit spatial multiplexer so that each optically modulated chaff signal supplied as an output from the at least one optically modulated chaff source is coupled by the transmit spatial multiplexer into a respective one of the plurality of spatial paths of the spatially multiplexing optical fiber that are other than the spatial path to which the at least one optically modulated transmit source is coupled, wherein at least one of the at least one optically modulated chaff source occupies substantially a same optical frequency range as at least one of the at least one optically modulated transmit source; and

    a receive spatial multiplexer configured to extract at least one spatial path from the spatially multiplexing fiber;

    wherein an aggregate optical power of all the optically modulated chaff sources within the optical frequency range substantially occupied by the optically modulated transmit source is chosen such that a ratio of transmit signal power to optically modulated chaff signal power coupled out at a fiber bend made at any location along the fiber is smaller than a required signal-to-noise ratio specified by at least one of the at least one optically modulated transmit source'"'"'s corresponding receiver to achieve error-free performance at its output.

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