Performance of PAM-4 VCSEL for short-reach 100 Gb/s per lane applications up to 85°C

Takeshi Aoki; Hiroyuki Hiiro; Rei Tanaka; Yuji Koyama; Susumu Yoshimoto; Masaki Yanagisawa

doi:10.1117/12.2607702

2 March 2022 Performance of PAM-4 VCSEL for short-reach 100 Gb/s per lane applications up to 85°C

Takeshi Aoki, Hiroyuki Hiiro, Rei Tanaka, Yuji Koyama, Susumu Yoshimoto, Masaki Yanagisawa

Proceedings Volume 12020, Vertical-Cavity Surface-Emitting Lasers XXVI; 120200C (2022) https://doi.org/10.1117/12.2607702
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

We report on development and characterization of 850 nm vertical-cavity surface-emitting lasers (VCSELs) having a -3dB modulation bandwidth above 24 GHz with a flat frequency response at temperatures up to 85°C. Aperture size is optimized for a high relaxation oscillation frequency with a narrow spectral width and low relative intensity noise. Two types of VCSELs (Gen 1 and Gen 2) with different epitaxial designs are fabricated with an optimized aperture size. Large-signal modulation at 53 GBd PAM-4 (106 Gb/s) is performed for eye diagram and TDECQ measurements. The Gen 1 VCSEL is capable of 53 GBd PAM-4 modulations at temperatures up to 70°C, but performance is insufficient at 85°C. The Gen 2 VCSEL with a stronger optical confinement achieves higher modulation bandwidth with an extremely suppressed resonance peak in frequency response, leading to reduction in TDECQ compared to the Gen 1 VCSEL. TDECQ below 4.5 dB are verified at temperatures up to 85°C without any pre-emphasis in the transmitter. Also, we use a pre-emphasis with 3-tap feed forward equalizer to improve the TDECQ by 2 dB. Furthermore, after the transmission over 100 m multimode fiber (OM5), the TDECQ keeps below 3.0 dB even at 85°C. These results demonstrate the capability of 850 nm VCSELs for 100 Gb/s per optical lane short-reach interconnects operating over a wide temperature range

Conference Presentation

Citation Download Citation

Takeshi Aoki, Hiroyuki Hiiro, Rei Tanaka, Yuji Koyama, Susumu Yoshimoto, and Masaki Yanagisawa "Performance of PAM-4 VCSEL for short-reach 100 Gb/s per lane applications up to 85°C", Proc. SPIE 12020, Vertical-Cavity Surface-Emitting Lasers XXVI, 120200C (2 March 2022); https://doi.org/10.1117/12.2607702

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