First demonstration of novel active multi-mode interferometer (MMI) LDs integrated with 1st order-mode permitted waveguides

Abstract

Abstract:Here we propose novel active multi-mode-interferometer (MMI) laser diodes (LDs) for 14XX nm fiber amplifier pump applications. The waveguide of the LDs is consisted from 1x1-MMI couplers integrated with 1 st order-mode permitted waveguides to enhance the total active area. Although there is no single-mode waveguide region inside the cavity, the novel active MMI-LDs emitted in stable singletransverse-mode output up to maximum output power. Moreover, they achieved high output power of 1.46 W, and low driving voltage of only 1.75 V at 1 W output power.

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

“…Designed active MMI-LD has a large MMI pumping section behind the modulation section, which is able to generate a high photon density in the comparatively narrow width modulation section. 27) In general the leaser modulation bandwidth is directly related the photon density. 35) So the reduction of the parasitic components indicates high modulation bandwidth for active MMI-LD and the potential of this device in high speed low cost optical communication systems.…”

“…Pumping region, separated from modulation region, consists of MMI waveguide that enables to emit larger optical power compared to single stripe waveguide. 27) The MMI, which enables the single mode optical field at the input to be identically imaged at the MMI output, 28) has a wider area than the single mode waveguides. The larger active area contributes to the reduction of series resistance, enhance output power 29) and also results a significantly lower driving voltage.…”

Active multi-mode interferometer semiconductor optical amplifier on quantum dots toward high saturated output power under high temperature

“…For this reason, we exploited MMI, not just multi-mode waveguide, to QD SOAs. Many papers have reported research on active-MMI devices, for example, high power active-MMI LDs, 32) active-MMI superluminescent LEDs (SLEDs) with a high output of 110 mW, 33,34) active-MMI SOA. 35) In the case of exploiting active-MMI to QD SOA, the total number of QDS increases; therefore; it is highly expected to have higher saturation output power, especially under high-temperature operation.…”

CW single-wavelength emission by using novel asymmetric configuration for active multi-mode interferometer laser diodes

“…So far, studies on active-MMI LDs [5,6] have focused on realizing high output power and low power consumption LDs for fiber amplifier pumps, fiber to the home (FTTH) light sources, and so on. For an active-MMI LD that has been designed with the proper length and width for the MMI section, the optical field of the spatial single-lateral mode at the MMI section should be identically imaged at the other MMI side.…”