Itf Laboratories Inc.

Yunfei Zhao

Changzun Zhou

A method for measuring and monitoring the state of polarization (SOP) of a polarization maintaining (PM) fiber using a narrowband fiber Bragg grating (FBG) written on the same is provided. The PM fiber comprises a first narrowband reference FBG which is used as a reference to measure and monitor the SOP of the PM fiber. Due to the birefringence properties of the PM fiber, the reference FBG typically reflects two narrowband spectra, each having a central wavelength; one in the slow axis and one in the fast axis. By measuring the intensity of the reflected spectra in each axis and by tuning the fiber with a polarization controller, it is possible to adjust the fiber to a predetermined SOP. Accurate measures of optical properties (e.g. reflectivity) of optical devices (e.g. a FBG grating), according to the predetermined SOP, are possible.

Method for monitoring and measuring optical properties of device in polarization maintaining fibers by using reference fiber bragg grating and fiber components manufactured thereby

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Saint-Laurent, Canada

Yunfei Zhao