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A two-color quantum dot DFB laser with 8 THz mode separation is demonstrated. The combination of the inhomogeneous broadening and a large coupling coefficient allows the manipulation of the quantum dot states through external optical stabilization.
The effect of external optical feedback on quantum dot two-section passively mode-locked lasers is investigated. The RF linewidth narrows down from 8 KHz in the free-running situation to a very low value of 350 Hz.
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