Tunable Fiber Bragg Grating Filter Research Articles

Fault detection technique for wavelength division multiplexing passive optical network using chaotic fiber laser

We propose a fault localization method for wavelength division multiplexing passive optical network (WDM-PON). A proof-of-concept experiment was demonstrated by utilizing the wavelength tunable chaotic laser generated from an erbium-doped fiber ring laser with a manual tunable fiber Bragg grating (TFBG) filter. The range of the chaotic lasing wavelength can cover the C-band. Basing on the TFBG filter, we can adjust the wavelength of the chaotic laser to match the WDM-PON channel with identical wavelength. We determined the fault location by calculating the cross-correlation between the reference and return signals. Analysis of the characteristics of the wavelength tunable chaotic laser showed that the breakpoint, the loose connector, and the mismatch connector could be precisely located. A dynamic range of approximately 23.8dB and a spatial resolution of 4cm, which was independent of the measuring range, were obtained.

Analysis and Development of a Tunable Fiber Bragg Grating Filter Based on Axial Tension/Compression

A tunable optical filter based on the axial strain of the fiber Bragg grating (FBG) is discussed. A wavelength range of 46 nm in compression and 10.5 nm in tension with negligible variations in reflectivity and bandwidth of the central Bragg wavelength reflectivity peak were obtained. The device consists of two fixed ferrules and one guiding ferrule. The difficulties with compressing the FBG were handled by carefully selecting tolerances and adjustment procedures. The device allows both tension and compression of FBG and the use of different FBG lengths and actuators. The effects of glue deformation and bending of the FBG during compression are analyzed in detail.

A high‐resolution tunable fiber Bragg grating filter

AbstractA tunable fiber Bragg grating (FBG) filter with a tuning resolution of less than one picometer (pm) is demonstrated. The FBG is embedded in carbon‐fiber composite material, which is bent by using a simple mechanical setup. A tuning range of 2 nm and repeatability of less than 0.4% are obtained. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 89–92, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20217