Investigation of Self-injection Locked Visible Laser Diodes for High Bit-rate Visible Light Communication

Md. Hosne Mobarok Shamim, Mohamed Shemis, Chao Shen, Hassan M. Oubei, Tien Khee Ng, Boon S. Ooi, Mohammed Zahed Mustafa Khan

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

We report on self-injection locking in InGaN/GaN (blue/green) and InGaP/AlGaInP (red) visible-light laser diodes. The free-space optical feedback path was accomplished via an external mirror. The effect of injection current, optical power injection ratio, and external cavity length on the spectral linewidth and modulation bandwidth of the lasers are investigated. Our results show that the laser performance was substantially improved. In particular, we achieved a significant increase of ~57% (1.53 GHz - 2.41 GHz) and ~ 31 % (1.72 GHz - 2.26 GHz) in the modulation bandwidth, and ~9 (1.0 nm to 0.11 nm) and ~ 9 (0.63 nm to 0.07nm) times reduction in spectral linewidth of the green and blue lasers, respectively. Consequently, side-mode-suppression-ratio was considerably increased in all the cases, reaching as high as ~20 dB in self-injection locked blue laser diode, thus enabling a close to single mode operation. This work paves the way for attaining high speed optical wireless communications by overcoming the challenges of limited modulation bandwidth and multimode operation of visible laser diodes with this simple scheme.
Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalIEEE Photonics Journal
Volume10
Issue number4
DOIs
StatePublished - Jun 22 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors thankfully acknowledge the support from Deanship of Research, King Fahd University of Petroleum and Minerals (KFUPM) through the grant KAUST004. The financial support from King Abdulaziz City for Science and Technology (KACST), Grant No. EE2381 and KACST TIC R2-FP-008 are gratefully acknowledged. This work was partially supported by King Abdullah University of Science and Technology (KAUST) baseline funding, BAS/1/1614-01-01, KAUST funding KCR/1/2081-01-01, and GEN/1/6607-01-01, as well as KAUST-KFUPM Special Initiative (KKI) Program, REP/1/2878-01-01.

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