Modulation Response of Monolithically Integrated External Optical Injection-Locking Semiconductor Ring Laser Based on PPR Effect

Abstract

The modulation response of monolithically integrated external optical injection-locking (EOIL) semiconductor ring lasers based on photon-photon resonance effect was systematically analyzed. The simulation results show that the modulation response of the EOIL laser is strongly dependent on the internal loss of the ring laser. Assuming that the waveguide was loss-free, the modulation bandwidth of as high as 67.5 GHz was predicted. However, due to the excessive loss associated with the bending waveguide of the circular-shaped ring laser, the modulation performance of such EOIL laser has no any advantage over its free-running counterpart. Instead, use of rectangular-shaped ring laser as the slave laser is proposed to circumvent the issue associated with the excessive waveguide loss, since the internal loss, in this case, is only dependent on the reflectivity of the total reflection mirrors. Simulation shows the modulation bandwidth of at least 38 GHz is achievable in such EOIL laser, provided the reflectivity of the total reflection mirrors is greater than 96%. It is believed that this theoretical study will facilitate the future experimental demonstration of the monolithically integrated EOIL lasers.

Keywords

• Direct modulation lasers
• external optical injection-locking
• monolithically integrated
• photon-photon resonance
• ring lasers