High intrinsic modulation bandwidth InGaAsP/InGaAsP 1.55 µm asymmetric active multimode interferometer laser diode by using split pump configuration

Abstract

InGaAsP multiple quantum well (MQW) asymmetric active multimode laser diode (active MMI-LD) with split pumping scheme has been demonstrated. Asymmeric configuration ensures the singlewavelength output from the designed device. Moreover, the advantage of having large multimode active pumping section behind the splitted modulation section is the key contributor for having higher photon density in modulation section without increasing the device length. By utilizing the split pump configuration in the designed active MMI-LD, high intrinsic 3 dB modulation bandwidth of 24.6 GHz is achieved. To the best of our knowledge this is the highest reported intrinsic modulation bandwidth for active MMI-LD. Required photon density to achieve more than 40 GHz 3 dB bandwidth for direct modulation is also clarified.

Demonstration of photon–photon resonance peak enhancement by waveguide configuration modification on active multimode interferometer laser diode

“…The proposed active-MMI LD consists of an asymmetric 1 × 1 MMI coupler connected to singlemode waveguides. 23) By exploiting this asymmetric MMI configuration, the active-MMI LD can have different-length cavities inside the waveguide.…”