To generate a widely-spaced comb there are two options. The first is to use a short cavity—corresponding to a high repetition rate—but this results in low power output and large optical linewidth. J.-Z. Huang et al. demonstrate in this work another approach, based on a technique known as colliding pulse mode-locking, dividing a long cavity in multiple short sections separated by saturable absorbers. This results in large emission power, small linewidth and satisfies the requirement of 100 GHz comb spacing. By combining four of these comb sources, each operating at a different temperature to cover a different spectral range, this approach holds promise for large bandwidth data transmission (up to 4.8 Tbit/s) for the future telecom optical interconnects.
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