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Two types of supermode noise, uncorrelated and correlated, are demonstrated for two different types of harmonically modelocked lasers. The correlated supermode noise is originated from the excitation of multiple correlated optical supermodes.
We report on supermode noise suppression of a harmonically modelocked laser by CW optical injection. Supermode noise spurs were reduced 20 dB to -130 dBc/Hz, and the optical spectrum became locked to the injected wavelength.
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