Single-Mode 940 nm VCSELs with narrow divergence angles and high-power performances for fiber and free-space optical communications
Zuhaib Khan , Nikolay Ledentsov Jr. , Łukasz Chorchos , Jie-Chen Shih , Yung-Hao Chang , Nikolay N. Ledentsov , Jin-Wei Shi
AbstractUsing 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.
|Journal series||IEEE Access, ISSN 2169-3536|
|Keywords in English||Vertical cavity surface emitting lasers, fiber optics, data communication|
|ASJC Classification||; ;|
|License||Journal (articles only); author's original; ; after publication|
|Score||= 100.0, 14-07-2020, ArticleFromJournal|
|Publication indicators||= 0; : 2018 = 1.718; : 2018 = 4.098 (2) - 2018=4.54 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.