Output characteristics of a simple FP-LD/FBG module

We propose a simple laser diode module that consists of a Fabry–Perot laser diode (FP-LD) and a fiber Bragg grating (FBG) for a compact, stable and low-cost wavelength division multiplexing light source. The spectral bandwidth of the laser output from the FP-LD/FBG module was measured to be 0.024nm. The side mode suppression ratio (SMSR) was 44.42dB at the injected electric current of 14mA and at 25°C. Both the BER characteristics and the eye diagram were measured, and they confirmed that the present laser diode module could be used as an alternative configuration for a low-cost light source.