Line monitoring system having frequency modulation for noise reduction
AssigneeSubcom, LLC
InventorsJin-Xing Cai, Yanjie Chai, Govind Vedala, Alexei N. Pilipetskii
Life of this patent
Estimating the term…
Abstract
A sensing system. The sensing system may include a transmitter to launch an outbound optical signal, a clock to generate a clock signal, and a chirp subcarrier coupled to the clock and configured to generate a chirp. The sensing system may further include a code generator coupled to the clock and configured to generate a code; and an intensity modulator, arranged to modulate the outbound optical signal and coupled to receive an intensity modulator signal that is derived at least in part from the code generator.
Claims20
A sensing system comprising:
- a transmitter to launch an outbound optical signal;
- a clock to generate a clock signal;
- a chirp subcarrier coupled to the clock and configured to generate a chirp;
- a code generator coupled to the clock and configured to generate a code;
- and
- an intensity modulator, arranged to modulate the outbound optical signal and coupled to receive an intensity modulator signal wherein the intensity modulator signal is derived at least in part from the code generator.
An optical communication system, comprising:
- a transmitter to launch a line monitoring signal (LMS) as an outbound optical signal along an outbound path;
- a loopback to route a Rayleigh reflection signal based upon the LMS to a return path;
- and
- a receiver to receive the Rayleigh reflection signal from the return path, wherein the transmitter comprises:
- a clock to generate a clock signal;
- a chirp subcarrier coupled to the clock and configured to generate a chirp;
- a code generator coupled to the clock and configured to generate a code;
- and
- an intensity modulator, arranged to modulate the outbound optical signal and coupled to receive an intensity modulator signal that is derived at least in part from the code generator.
A method, comprising:
- launching an outbound optical signal over a first signal path;
- applying a step chirp to the outbound optical signal, wherein a stepped outbound signal is generated, comprising a stepped frequency variation as a function of time;
- receiving a Rayleigh backscattering signal over a second signal path, the Rayleigh backscattering signal being based upon the stepped outbound signal;
- and
- processing the Rayleigh backscattering signal to determine a location of an origin of the Rayleigh backscattering signal, based upon a frequency of the Rayleigh backscattering signal.
Dependencies are inferred from the claim text.