Central wavelength tunable mechanism for temperature compensated package of fiber Bragg gratings

The central wavelength of fiber Bragg grating (FBG) must be located in the specified channel band of wavelength division multiplexer (WDM) in optical communication network. Furthermore, the central wavelength also must he stable in the ambient temperature. A temperature compensated fixture Is therefore essential for the application of FBG. By the strength of materials, a theoretical model of the fully temperature compensated fixture can he derived for zero shift of central wavelength of FBG in ambient temperature. Besides, a microtunable mechanism for the pre-pulling force on the FBG is synthesized to adjust the central wavelength to a certain channel band. By this tunable mechanism one can calibrate effectively and efficiently the FBG in mass production of FBG based products.