Control of dual-wavelength laser using monolithically integrated phase-controlled optical feedback

Abstract

In this conference proceeding, we present a novel technique to control the emission of dual-wavelength lasers. Using a well designed external cavity, we demonstrate that tuning the optical feedback phase allows to efficiently tailor the output power balance between the two wavelengths emitted by the laser. With this technique, a complete switch between one and the other mode can also be achieved and we report a suppression ratio up to 40 dB. Due to its simplicity, the structure can be monolithically integrated easily with the laser itself and offers a precise control of the dual-wavelength emission using a single control parameter.

Dual-wavelength laser with phase-controlled optical feedback loop for rapid switching

“…Using phase-controlled optical feedback we show that the balance in power between the two wavelengths can be tuned with only one parameter, the EOPM voltage. We have shown that it is possible to switch between the wavelength with a high suppression ratio of up to 25 dB and beyond [11] . In addition, this approach appears to provide switching capability at a fast pace in the nanosecond range, and possibly faster.…”

Influence of Cross-Coupling on Dual-Wavelength Lasers Subject to Single Optical Injection

“…The slave laser is a dual-cavity InP distributed Bragg reflector (DBR) laser with a single semiconductor optical amplifier (SOA) serving as the common gain medium. The dual cavity laser is established through the sequential arrangement of two DBR structures on one side, and a two-port broadband reflector (BR) on the other side [32,33]. The pitch of the DBRs is set to obtain a spectral separation of 10 nm between the two reflectivity bands.…”

On-chip multiwavelength lasers enabling nanosecond scale wavelength switching times

“…Such a functionality is promising for various applications in the context of THz signal generation, THz communication systems or conversion of signal wavelengths using optical injection, especially if the wavelength switching process is fast. Wavelength switching occurs when one wavelength undergoes constructive interference in the external feedback cavity while the other suffers from destructive interference [1]. By shifting the phase in the feedback cavity, with e.g.…”