抄録
We theoretically considered suitable configurations of a fiber grating laser (FGL) to be used in wavelength division multiplexing (WDM) systems. We focused on the effect of composite reflectors where the effect of the front facet of a semiconductor optical amplifier (SOA) is especially significant. We simulated relaxation oscillation frequency and optical power to determine a configuration enabling high bit rates, up to 2.5 Gbit/s. After arriving at a suitable configuration, a packaged FGL has been fabricated. This laser achieves higher output power than any previously reported, and the potential for a rate of 2.5 Gbit/s was confirmed. Compared with a typical 1.55 μm MQW DFB laser, the lasing wavelength temperature dependence is less than half that of a DFB laser. As frequency chirping is remarkably reduced, the power penalty of the FGL is 3 times smaller than that of a DFB laser in transmission experiment with SMF of 70 km.
