Individual or simultaneous monitoring of the temperature and strain variations by use of the high birefringence fiber loop
mirror is newly proposed and demonstrated with reduced cross sensitivity. It is accomplished by incorporating two types
of high birefringence fibers in the loop arm, which are spliced together to act as the compact sensing head. By properly
choosing their birefringence, cutting their lengths and setting their relative orientation with respect to the primary axes,
the temperature and strain may be individually or simultaneously measured with the effectively reduced cross sensitivity.
A discretely tunable fiber ring laser based on a Sagnac interferometer incorporating a few-mode polarization maintaining
fiber and semiconductor optical amplifier as the gain media is presented. Nine lasing wavelengths at a tuning step of 2.5
nm is achieved with side-mode suppression ratio over 20 dB.
We propose a novel approach for resolving temperature and strain variations by use of Sagnac interferometer incorporating
two types of high birefringence fibers (HBFs) and a polarization controller. The two types of HBFs are spliced
together to act as the sensing head for temperature and strain discrimination. The detected parameters are two wavelength
dips over a broad wavelength range in the transmission spectrum of the Sagnac interferometer, whose sensitivity
responses to temperature and strain both depend on those of the two HBFs. As a result, the sensitivity responses can be
controlled by adjusting the polarization controller adjacent to the sensing head to shift the wavelength dips and then
change their degrees of dependence on the two HBFs.
A feedback high birefringence fiber loop mirror is proposed and theoretically analyzed. Large effective free spectral
range can be achieved by the intrinsic vernier effect between the fast and slow axes in the high birefringence fiber,
which is independent of the input signal polarization.
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