Patent ID: 8154715
Filing Date: 2012-04-10
Classification: G01D,G01M,G02B

Abstract:
1. A method for measuring and/or adjusting the state of polarization of a polarization maintaining optical fiber, said method comprising: providing said polarization maintaining fiber, said polarization maintaining fiber defining a slow axis and a fast axis, said fiber having an orientation; writing a narrowband reference fiber Bragg grating on said fiber, said reference fiber Bragg grating having a first reflection spectrum and a first transmission spectrum; sending a beam of light through said fiber; detecting said first transmission spectrum or said first reflection spectrum of said reference fiber Bragg grating; measuring a first intensity of a first peak in said first transmission spectrum or in said first reflection spectrum, said first peak being associated with said slow axis of said fiber; measuring a second intensity of a second peak in said first transmission spectrum or in said first reflection spectrum, said second peak being associated with said fast axis of said fiber; determining said state of polarization of said fiber by comparing said first intensity and said second intensity; writing a second fiber Bragg grating on said fiber, said second fiber Bragg grating having a second reflection spectrum and a second transmission spectrum, said second reflection spectrum being distinct from said first reflection spectrum and said second transmission spectrum being distinct from said first transmission spectrum; measuring at least one optical property of said second fiber Bragg grating in accordance with said state of polarization.