Comparison of single-/few-/multi-mode 850 nm VCSELs for optical OFDM transmission

Hsuan Yun Kao, Cheng Ting Tsai, Shan Fong Leong, Chun Yen Peng, Yu Chieh Chi, Jian Jang Huang, Hao-Chung Kuo, Tien Tsorng Shih, Jau Ji Jou, Wood Hi Cheng, Chao Hsin Wu, Gong Ru Lin*

*Corresponding author for this work

Research output: Contribution to journalArticle

26 Scopus citations


For high-speed optical OFDM transmission applications, a comprehensive comparison of the homemade multi-/few-/single-transverse mode (MM/FM/SM) vertical cavity surface emitting laser (VCSEL) chips is performed. With microwave probe, the direct encoding of pre-leveled 16-QAM OFDM data and transmission over 100-m-long OM4 multi-mode-fiber (MMF) are demonstrated for intra-datacenter applications. The MM VCSEL chip with the largest emission aperture of 11 μm reveals the highest differential quantum efficiency which provides the highest optical power of 8.67 mW but exhibits the lowest encodable bandwidth of 21 GHz. In contrast, the SM VCSEL chip fabricated with the smallest emission aperture of only 3 μm provides the highest 3-dB encoding bandwidth up to 23 GHz at a cost of slight heat accumulation. After optimization, with the trade-off set between the receiving signal-to-noise ratio (SNR) and bandwidth, the FM VCSEL chip guarantees the highest optical OFDM transmission bit rate of 96 Gbit/s under back-to-back case with its strongest throughput. Among three VCSEL chips, the SM VCSEL chip with nearly modal-dispersion free feature is treated as the best candidate for carrying the pre-leveled 16-QAM OFDM data over 100-m OM4-MMF with same material structure but exhibits different oxide-layer confined gain cross-sections with one another at 80-Gbit/s with the smallest receiving power penalty of 1.77 dB.

Original languageEnglish
Pages (from-to)16347-16363
Number of pages17
JournalOptics Express
Issue number14
StatePublished - 10 Jul 2017

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