Abstract
Ultra-low noise frequency combs are critical building blocks for numerous emerging applications such as ultra-low noise microwave generation. To generate low noise frequency combs, fast modulators to stabilize the offset frequency (fceo) besides the repetition frequency (frep) are indispensable. In most combs, pump current modulation and bulk (or waveguide) EOMs are used as the two fast actuators. However, the bandwidth of pump current modulation is limited by the lifetime of the gain medium and EOMs are bulky. To overcome these limitations one can exploit cavity loss modulation, (limited in bandwidth only by the photon life-time inside the cavity), as enabled in a compact form factor by the recently developed graphene EOMs [1]. We demonstrate here that graphene can work as a fast modulator not only for fceo, but also for frep in Er frequency combs.
© 2015 IEEE
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