100-GHz-spaced 8-channel frequency control of DBR lasers for virtual wavelength path cross-connect system

The authors propose a simultaneous frequency control scheme for multiple DBR lasers in a virtual wavelength path (VWP) cross-connect system. The frequencies of eight DBR lasers are switched and held to the 100 GHz-spaced grid anchored at 193100 GHz, and stabilized to within 100 MHz for 12 h.