Terahertz span >60-channel exact frequency dense WDM source using comb generation and SG-DBR injection-locked laser filtering

Results for a simple, exact frequency synthesizer for dense wavelength-division multiplexing (WDM) are reported. Channel selection over >1-THz range with programmable channel spacing up to 25 GHz and absolute optical frequency referencing is achieved using widely tunable sampled grating distributed Bragg reflector (DBR) lasers, injection-locked to an amplified fiber loop comb generator.

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