Impact of refractive index profile defects on transmission performance in installed multimode fiber

Scott S.-H. Yam; Cyril Hnatovsky; Rod Taylor; Fu-Tai An; Supriyo Sinha

doi:10.1117/12.628616

13 October 2005 Impact of refractive index profile defects on transmission performance in installed multimode fiber

Scott S.-H. Yam, Cyril Hnatovsky, Rod Taylor, Fu-Tai An, Supriyo Sinha

Proceedings Volume 5970, Photonic Applications in Devices and Communication Systems; 59701P (2005) https://doi.org/10.1117/12.628616
Event: Photonics North, 2005, Toronto, Canada

Abstract

Multimode fiber (MMF) has found applications in high-speed computer interconnect, local area networks (LAN), and storage area networks (SAN) due to its ease of handling and high performance over short span. However, modal dispersion limits its bandwidth-distance product (BDP) to about 2 Gb/s-km. This limit has been extended by recent new generation of optimized MMF to 28 Gb/s-km, but there is evidence that a substantial portion of installed MMF have imperfect refractive index (RI) profiles due to defects during the manufacturing process, and the BDP might be at best no more than 500 Mbps-km. Different strategies have been proposed to address this issue by employing offset launch, multi-level subcarrier modulation, and mode spatial control. However, our studies have shown that end-to-end system performance of installed MMF can be highly dependent on input launch polarization. In this report, we investigate, for the first time to our knowledge, the relationship between RI profile defect, input launch condition, and transmission performance in commercial-grade MMF, both 50 μm and 62.5 μm. To this end, a number of techniques have been deployed. Two-dimensional (2D) MMF RI profile is obtained by a micro-reflectivity technique with a spatial resolution of ~400 nm. MMF transmission characteristics are interrogated using interferometric techniques. Data at 40 Gb/s are transmitted over the same MMF sample at different launch conditions, and the system performance is evaluated by bit-error rate measurements. These results are then analyzed to provide insights to correlate fiber RI profile defects and high-speed data transmission performance for installed commercial-grade MMF for optical access networks.

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Scott S.-H. Yam, Cyril Hnatovsky, Rod Taylor, Fu-Tai An, and Supriyo Sinha "Impact of refractive index profile defects on transmission performance in installed multimode fiber", Proc. SPIE 5970, Photonic Applications in Devices and Communication Systems, 59701P (13 October 2005); https://doi.org/10.1117/12.628616

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KEYWORDS

Polarization

Multimode fibers

Local area networks

Eye

Modulation

Refractive index

Single mode fibers

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