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Performance optimisation of ultra-long Raman laser links is studied theoretically and experimentally. We observe that it is possible to reduce signal power excursion by adjusting FBG reflectivity without compromising pump efficiency.
We report a novel demodulation scheme for the detection of small Bragg wavelength shifts in a fiber Bragg grating strain sensor by exploiting the optical feedback reflected from the grating structure back into a 1310 nm laser diode integrating a photodiode. The dynamic strain generated by a mechanical vibrator is applied transversely to the fiber Bragg grating and the desired longitudinal strain values...
We report a strong polarization dependent coupling behavior of fiber Bragg gratings with excessively tilted structures up to 81deg. This unique property has been utilized to implement a novel twist sensor, showing high torsion sensitivity. The twist induced light coupling interchange between the two birefringence modes makes it possible to interrogate such a sensor using low-cost intensity demodulation...
We review recent advances in development of fibre grating based optical biosensor devices and applications. The emphases will be on novel grating structures UV-inscribed in D-shape, single and multi mode, and multicore fibres and their post-sensitisation by HF-etching technique. Some of these devices have been used to detect concentration of hemoglobin protein in sugar solution, showing a sensitivity...
We report an in-fiber polarizer implemented using a 45deg-tilted fiber Bragg grating. Polarization extinction ratio of 28 dB at 1550 nm and HMFW over 80 nm has been demonstrated. When the un-polarized light passes this device, 99.5% of degree of polarization can be achieved
We report the realization of low-cost in-fiber WDM device function utilizing efficient side-detection of strong radiation mode out-coupling from tilted FBGs. The spatial-to-spectral conversion efficiency as high as 0.32 mm/nm is demonstrated.
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