Active Multimode Interferometer Laser Diode Research Articles

A space mode selective light source with over 40 GHz direct modulation bandwidth

A high-speed mode selective light source with over 40 GHz direct modulation bandwidth on both 0th and 1st order modes was demonstrated on an active multimode interferometer laser diode (active-MMI LD). By introducing multiple photon-photon resonances (PPR), the bandwidth of small signal frequency response is extremely extended. As the advantage of the active-MMI, the designed PPR frequencies are stable and do not change as the cleaving condition changes. In this work, 1 × 3 asymmetric active-MMI LD was fabricated to introduce multiple PPRs. Over 40 GHz direct modulation bandwidth has been confirmed experimentally on both 0th and 1st order modes.

Bandwidth enhancement scheme demonstration on direct modulation active-MMI laser diode using multiple photon photon resonance

By introducing properly designed multiple photo photon resonances (PPRs) on an active-Multimode Interferometer Laser Diode, the confirmed direct modulation bandwidth was enhanced from less than 5 GHz to at least 34 GHz. Multiple oscillating cavities that have slightly different free space ranges (FSRs) are integrated within a single device. The overlap between such FSRs contributes to multiple wavelength differences that are directly related to the PPR frequencies. Evaluated PPR frequencies from experimental data match with designed frequencies. The potential of the 100 GHz level bandwidth of the device has been proved.

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

The recent rapid growth of data traffic is leading to high-speed communication for local areas, such as the fiber-to-the-home service. A semiconductor laser is used for such a purpose; however, there is the difficulty that an even higher frequency response occurs in only carrier-photon resonance. For this reason, it is effective to use a second resonance, such as a photon–photon resonance (PPR), for enhancing the frequency response, and the active multimode interferometer laser diode (active-MMI LD) is one of the candidates for achieving a high PPR frequency. In order to obtain an even higher PPR frequency, we have investigated the control scheme of enhancing PPR. In this work, we compared two types of active-MMI waveguide structures to confirm the scheme. As a result, a 3.8 GHz enhancement of the PPR peak, resulting in a 3 dB lower frequency response of 17 GHz, has been successfully achieved by waveguide geometry modification.

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

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

High power with low electric power consumption active multi-mode-interferometer laser diode for fibre-amplifier

Active multi-mode interferometer laser diodes (LDs), implemented in InGaAsP/InP, achieved a significant reduction of 40% (at 0.4 W output) in electric power consumption compared to regular single lobe LDs. With them, a high output power of 0.7 W was also obtained at 14XX nm.

Active multimode interferometer laser diode demonstrated via 1.48 [micro sign]m high power application

An active multimode interferometer (MMI) laser diode (LD) concept is presented, which has been verified via a 1.48 µm high power application. The active MMI-LDs, having a larger pumping area compared to that of regular single-stripe LDs with the same length, showed no significant degradation in slope efficiency and up to 50 mW power improvement resulting in 170 mW saturated output power.