Full control of polarisation in fibre delivered light for harsh environments
AssigneeNational Research Council of Canada
InventorsLouis Gaudreau, Jason Phoenix, Sergei Studenikin, Marek Korkusinski, Alex Bogan, Andrew Sachrajda, Robin Williams, Piotr Zawadzki
Life of this patent
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Abstract
A method of transmitting information comprising the steps of: (a) transmitting at least one photon via a fibre; (b) characterizing the fibre by determining at least one depolarization loss caused by the fibre; and (c) compensating for polarization altering effects of the fibre; wherein a single photon source is used for delivery of individual polarized photons in harsh environments.
Claims15
A method of transmitting information via a transmission path, the method comprising the steps of:
- generating a model of the transmission path comprising the steps of:
- transmitting at least one photon of a known polarization state via a fibre;
- and
- characterizing the fibre by determining at least one depolarization loss caused by the fibre by at least:
- detecting the at least one photon outputted by the fibre;
- determining the intensity of the outputted at least one photon;
- measuring the output polarization state of the at least one photon to generate at least one polarization map;
- determining characteristics of the transmission path by fitting the output polarization state of the at least one photon to the model using a genetic algorithm program;
- and
- compensating for polarization altering effects of the fibre by at least:
- determining an orientation angle of at least one optical component for introduction into the transmission path for compensating for polarization altering effects of the fibre.
A method of transmitting information via a transmission path comprising the steps of:
- (a) generating a model of the transmission path comprising the steps of:
- (i) inputting at least one photon of a known polarization state from a light source into a one end of a fibre;
- (ii) detecting the at least one photon outputted at another end of the fibre;
- (iii) determining the intensity of the outputted at least one photon;
- (iv) measuring the output polarization state of the at least one photon to generate at least one polarization map;
- (b) determining characteristics of the transmission path by fitting the output polarization state of the at least one photon to the model;
- (c) determining an orientation angle of at least one optical component for introduction into the transmission path for compensating for polarization altering effects of the fibre;
- and
- wherein the at least one polarisation map is fit to the model using a genetic algorithm program.
A method of compensating for transmission impairment, the method comprising:
- receiving at least one photon of a known polarization state which has been distorted by an optical transmission channel;
- processing the outputted at least one photon by modeling an optical fibre, corresponding to the optical fibre, in an optical transmission channel, corresponding to the optical transmission channel, the modeling using a plurality of input parameters comprising at least fibre parameters;
- wherein at least one waveplate compensates for the polarisation-altering effects of the fibre, and wherein the plurality of input parameters comprises offsets between each of the at least one waveplates' fast axes and settings of at least one rotator associated with each of the at least one waveplate, and an offset between at least two linear polarisers.
Dependencies are inferred from the claim text.