High Performance self-injection locked 524 nm green laser diode for high bitrate visible light communications

Abstract

First demonstration of self-injection locking on 524 nm visible laser diode is presented. Enhancement by ~440 MHz (~30%) in modulation bandwidth, ~7 times reduction in lasing linewidth, and ~10 dB improvement in SMSR is achieved.

Investigation of Self-Injection Locked Visible Laser Diodes for High Bit-Rate Visible Light Communication

“…In summary, a maximum bandwidth enhancement of ∼880 MHz (1.53-2.41 GHz) for green, ∼540 MHz (1.72-2.26 GHz) for the blue and ∼320 MHz (1.92-2.24 GHz) for the red laser diodes are achieved via self-injection locking technique. It is worth mentioning at this instance that all these lasers exhibited significant performance improvement compared to our first and initial results on spectral linewidth (∼1.3 times) and modulation bandwidth (∼2 times) improvement, which were reported on an unoptimized setup [16], [17].…”

“…Very recently, owing to the merits offered by SIL viz. energy efficiency, compact scheme, etc., our group successfully demonstrated SIL on 524 nm green [16] and 450 nm blue InGaN/GaN diode lasers [17]. Besides, [18] utilized SIL to demonstrate a single longitudinal mode operation at 446.5 nm blue laser diode with magnesium fluoride (MgF 2 ) whispering gallery mode (WGM) resonator.…”