Optimization of mode numbers of VCSELs for small-cell backhaul applications

I. Cheng Lu*, Chia Chien Wei, Jin Wei Shi, Hsing Yu Chen, Sheng Fan Tsai, Dar Zu Hsu, Zhi Rui Wei, Jhih Min Wun, Jye-Hong Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


This paper reports optical orthogonal frequency-division multiplexing (OFDM) transmission using 850 nm Zn-diffusion Vertical-Cavity Surface-Emitting Lasers (VCSELs) and multimode fiber (MMF) for small-cell backhaul applications. We also investigated the influence of side mode suppression ratio (SMSR) on the performance of OFDM modulation. By further optimizing the Zn-diffusion conditions and oxide aperture size, a high-power (6.7 mW) SM (SMSR>30 dB) VCSEL is demonstrated. By using OFDM modulation and bit-loading algorithm, record-high BRDP (91 Gb/s km) at 26 Gb/s transmission under FEC threshold (bit error rate (BER)<3.8×10-3) across 3.5 km OM4 fiber has been successfully demonstrated.

Original languageEnglish
Pages (from-to)81-87
Number of pages7
JournalOptics Communications
StatePublished - 1 Jan 2015


  • Fiber-optic backhaul
  • Fiber-optical communications
  • OFDM
  • Small cell


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