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We propose and demonstrate a technique to control the balance between the twoamplitudes of a dual-wavelength laser based on a phase-controlled opticalfeedback. The feedback cavity length is adjusted to achieve a relative phaseshift between the desired emission wavelengths, introducing a boost in gain forone wavelength while the other wavelength experiences additional losses. Tuningthe optical feedback phase proves to be an effective way to control the gainand losses, and, thus, to select one or balance the amplitude of the twoemission wavelengths. This concept can be easily adapted to any platform,wavelength range and wavelength separations providing that a sufficient carriercoupling and gain can be obtained for each mode. To demonstrate the feasibilityand to evaluate the performance of this approach, we have implemented twodual-wavelength lasers with different spectral separations together withindividual optical feedback loops onto a InP generic foundry platform emittingaround 1550 nm. An electro-optical-phase-modulator is used to tune the feedbackphase. With this single control parameter, we successfully achieved extinctionratios of up to 38.6 dB for a 10 nm wavelength separation and up to 49 dB for a1 nm wavelength separation.

Control of dual-wavelength laser emission via optical feedback phase tuning