An analysis and simulation about conditioned launch for very short reach (VSR-4)

Xiongbin Chen; Jiuchun Jia; Hongda Chen; Yi Zhou; Rongxuan Shen; Chao Zuo

doi:10.1117/12.574268

11 February 2005 An analysis and simulation about conditioned launch for very short reach (VSR-4)

Xiongbin Chen, Jiuchun Jia, Hongda Chen, Yi Zhou, Rongxuan Shen, Chao Zuo

Proceedings Volume 5625, Optical Transmission, Switching, and Subsystems II; (2005) https://doi.org/10.1117/12.574268
Event: Asia-Pacific Optical Communications, 2004, Beijing, China

Abstract

VSR4 links use graded index multimode fibers (GIMMFs) as the transmission medium with operation wavelength 850nm. For cost reasons, VCSEL has been selected as the optical source to VSR4. The minimum bandwidth specification for 62.5um GIMMF in VSR4 is only 400 MHz•km for over-filled-launch (OFL) condition. The distance of 300 meters is limited over transmission rates of 1.25Gbit/s on the basis of this specification. In order to overcome the OFL bandwidth limit by selective excitation of a limited number of modes, conditioned launch technique is investigated. In this paper, based on a comprehensive dispersion theory of GIMMF, a model is built to simulate the transmission of optical signal in GIMMFs and a comparison between OFL and conditioned launch is analyzed. The result can be the guidelines for the best choice of techniques for various LAN and interconnect systems also.

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Xiongbin Chen, Jiuchun Jia, Hongda Chen, Yi Zhou, Rongxuan Shen, and Chao Zuo "An analysis and simulation about conditioned launch for very short reach (VSR-4)", Proc. SPIE 5625, Optical Transmission, Switching, and Subsystems II, (11 February 2005); https://doi.org/10.1117/12.574268

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KEYWORDS

Vertical cavity surface emitting lasers

Multimode fibers

Refractive index

Colorimetry

Local area networks

Signal attenuation

Beam shaping

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