Single-Mode 940 nm VCSELs with narrow divergence angles and high-power performances for fiber and free-space optical communications

Zuhaib Khan, Nikolay Ledentsov, Lukasz Chorchos, Jie Chen Shih, Yung Hao Chang, Nikolay N. Ledentsov, Jin Wei Shi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Using the Zn-diffusion and oxide-relief techniques with the optimized aperture sizes, we demonstrate a novel single-mode 940 nm vertical-cavity surface-emitting laser (VCSEL) with high brightness performance. The highly single-mode (SM) output optical spectra (SMSR>50 dB) can be sustained under a full range of bias currents and from room temperature (RT) to 85°C operation. Under RT operation, the maximum SM power can be as high as 7.1 mW with a moderate threshold current (Ith : 1.1mA) and narrow divergence angles in the far-field pattern (FWHM: 5°, 1/e2: 7-8°). Furthermore, the maximum 3-dB E-O modulation bandwidth of this high-power SM VCSEL can reach 15 GHz without the low-frequency roll-off induced by spatial hole burning effect. By using this novel device as the transmitter, we can achieve 25 Gbit/sec error-free (bit-error-ratio (BER) < 1× 10-12) transmission over a 400 meter OM5 fiber without using any signal processing technique. This novel high-speed and high-brightness SM 940 nm VCSEL can serve as a light source in single-mode fiber for medium-reach (>0.3 km) data communications as well as in free-space optical communication.

Original languageEnglish
Article number9066926
Pages (from-to)72095-72101
Number of pages7
JournalIEEE Access
Volume8
DOIs
StatePublished - 2020

Keywords

  • Vertical cavity surface emitting lasers
  • data communication
  • fiber optics

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