100 nm Broadly tunable InGaAsP/InP asymmetric multiple quantum well (AMQW) ridge waveguide laser diodes has limited applications because of its low output power problem. The current injection efficiency of such lasers in average is 18 %. A FlexPDE simulation model showed that the main reason for this poor current injection efficiency is the ridge structure. Since the ridge structure is an essential part of these type of laser diodes, we proposed a forced electrical confinement method to improve current injection efficiency of these lasers. The simulation data for the proposed method showed that it is possible to increase the current injection efficiency up to 90 %. The simulation data also, showed a reduction of nearly 10°C in the maximum temperature of these devices compared with original AMQW devices. This temperature improvement is significant and can lead to a significant improvement of the laser output power. Experimental data however, give less optimistic results. The experimental data did show improvement in the current injection efficiency but also showed creation of recombination centers that reduce the temperature and power improvement. The proposed method can be efficient but a passivation technique needs to be developed for these devices.
The effect of the length of wide tunable AMQW laser on its output power is demonstrated in this paper. The InP based AMQW laser is custom designed and fabricated to have a large tuning range. The experimental data showed that the output power profile is not following the traditional behavior of laser diodes. The data showed that the laser length can be categorized in three categories, below transitional cavity length (BTCL), above the transitional cavity length (ATCL), and at the transitional cavity length (TCL). The BTCL and ATCL lengths are not suitable for wide tunable applications however the TCL length is suitable for wide tunable applications and the power profile is closer to the traditional power profile of laser diodes. This type of AMQW laser diodes can be used in many applications.
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