Characteristics of large bandwidth fiber Bragg grating with short grating length

The most significant feature of a fiber Bragg grating is the relatively narrow bandwidth of its reflection spectrum. In certain cases where a wider bandwidth is needed, we must modify the fiber Bragg grating. The best way to achieve this is by using a short grating length in the design of the fiber Bragg grating. The characteristics of short grating length have been observed using coupled mode theory methods. The short grating behaviour is clearly shown and discussed in this paper.