High-Speed 850&#xA0;nm Quasi-Single-Mode VCSELs for Extended-Reach Optical Interconnects

Rashid Safaisini; Krzysztof Szczerba; Petter Westbergh; Erik Haglund; Benjamin Kögel; Johan S. Gustavsson; Magnus Karlsson; Peter Andrekson; Anders Larsson

doi:10.1364/JOCN.5.000686

Journal of Optical Communications and Networking
Vol. 5,
Issue 7,
pp. 686-695
(2013)
•https://doi.org/10.1364/JOCN.5.000686

High-Speed 850 nm Quasi-Single-Mode VCSELs for Extended-Reach Optical Interconnects

Rashid Safaisini, Krzysztof Szczerba, Petter Westbergh, Erik Haglund, Benjamin Kögel, Johan S. Gustavsson, Magnus Karlsson, Peter Andrekson, and Anders Larsson

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Rashid Safaisini, Krzysztof Szczerba, Petter Westbergh, Erik Haglund, Benjamin Kögel, Johan S. Gustavsson, Magnus Karlsson, Peter Andrekson, and Anders Larsson, "High-Speed 850 nm Quasi-Single-Mode VCSELs for Extended-Reach Optical Interconnects," J. Opt. Commun. Netw. 5, 686-695 (2013)

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Abstract

This paper presents recent results on high-speed, quasi-single-mode, 850 nm vertical-cavity surface-emitting lasers (VCSELs) with a narrow spectral width for extended-reach optical interconnects. The top mirror reflectivity is adjusted for high output power, slope efficiency, and small signal modulation bandwidth. An oxide confined VCSEL with an $\sim 3 μm$ aperture diameter delivers 2 mW of output power and reaches a resonance frequency as high as 25 GHz and a modulation bandwidth exceeding 20 GHz. A small K-factor of 0.17 ns and a large D-factor of $17.3 GHz / {mA}^{1 / 2}$ , extracted from the VCSEL modulation response, along with the improved DC and modal properties enable energy-efficient data transmission at high bit rates over long-distance multimode fiber. Error-free transmission at bit rates exceeding $20 Gbits / s$ over 1.1 km of OM4 fiber is demonstrated and shown to be limited mainly by the photoreceiver bandwidth. A theoretical investigation of the dependence of link performance on photoreceiver bandwidth is also presented.

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		BTB	500 m	800 m	1.1 km
10 GHz real receiver	20G meas.	$- 9.6$	$- 9.3$	$- 8.4$	$- 7.7$
	20G calc.	$- 9.7$	$- 8.9$	$- 7.2$	$- 7.8$
	22G meas.	$- 8.6$	$- 8.2$	$- 6.0$	$- 6.7$
	22G calc.	$- 8.8$	$- 7.8$	$- 5.6$	$- 6.4$
	25G meas.	$- 7.2$	$- 6.1$	—	—
	25G calc.	$- 7.3$	$- 5.9$	$- 2.2$	$- 3.6$
15 GHz theoretical receiver	20G calc.	$- 10.7$	$- 9.9$	$- 8.3$	$- 8.8$
	22G calc.	$- 10.2$	$- 9.3$	$- 7.2$	$- 7.9$
	25G calc.	$- 9.4$	$- 8.2$	$- 5.4$	$- 6.4$

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Journal of Optical Communications and Networking