Transmission Performance of OM3, OM4 and OM5 Multimode Fibers
■50 Gbps PAM4 transmissions at 850 nm and 908 nm, and 100 Gbps SWDM4 transmissions over OM3/OM4/OM5 fibers were carried out. OM5 fiber can support 50 Gbps PAM4 transmission links of 500 m at 850 nm and 300 m at 908 nm. Another OM5 fiber can support an over 400 m link of 100 Gbps SWDM4 transmission, while the right-tilted OM3/OM4 fibers can only support 100 m and 150 m links, respectively, with similar EMB at 850 nm as the OM5 fiber.
■Keywords: OM5, OM4, OM3, multimode fiber, PAM4, BiDi, SWDM, high speed transmission
●INTRODUCTION
■Laser optimized multimode fibers (MMF) combined with low-cost VCSELs are competitive in short reach fiber solutions for local area networks (LANs) and data centers (DCs). Currently 10GBASE-SR and 40GBASE-SR4 solutions are widely used. 100GBASE-SR4 has also been deployed. The IEEE 802.3bs standard has recently approved 400GBASE-SR16 on 25Gbaud lanes on OM3/OM4/OM5 fibers [1]. All these technologies are implemented by parallel transmissions. As the data transmission rate increases, more fiber pairs will be needed. Two wavelengths Bi- Direction (BiDi) and Shortwave Wavelength Division Multiplexing (SWDM) are promising techniques to reduce the fiber counts used in high-speed LANs and DCs. 100 Gbps BiDi solution takes advantages of both multiple lanes and quadrature-pulse-amplitude modulation (PAM4), utilizing two channels near 850 nm and 910 nm to save half the amount of fibers. SWDM4 technology targeting an operational window between 850 nm and 950 nm with VCSELs to support 4 wavelengths saves four times the amount of fibers [2, 3].
■The Multisource Agreement (MSA) of SWDM has released specifications for 40G and 100G SWDM4 with OM3/OM4/OM5 fibers. However, it is worth noting that OM5 fibers are designed specifically for multi-wavelength applications, whose bandwidth peak is usually near 880 nm, taking account of the bandwidths at both ends of 850~950 nm. In production, effective mode bandwidths (EMBs) at 850 nm and 953 nm are under daily monitoring for OM5 fibers, to guarantee bandwidth performance for multi-wavelength applications. Differently, OM3/OM4 fibers’ bandwidth is optimized only for 850 nm. EMBs at longer wavelength are not in production control for OM3/OM4 fibers.
■In this paper, we carry out 50 Gbps PAM4 transmissions at 850 nm and 908 nm over OM3/OM4/OM5 fibers firstly. As a result, the OM5 fiber sample can support 500 m at 850 nm and 300 m at 908 nm employing IEEE standard KP4 FEC with a BER threshold at 2E-4. Secondly, 100 Gbps SWDM4 transmissions over another OM5 fiber sample as well as two types of OM3 and OM4 fibers are studied. The BER performance of 400 m OM5 shows adequate margin to achieve error free transmission in data center systems applying IEEE standard KR4 FEC with a BER threshold at 5E-5.
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OM3 Multimode Fibers 、 OM4 Multimode Fibers 、 OM5 Multimode Fibers 、 multimode fiber 、 fibers 、 OM5 fiber 、 Laser optimized multimode fibers 、 MMF 、 OM3 fibers 、 OM4 fibers |
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[ multi-wavelength applications ][ local area networks ][ LANs ][ data centers ][ DCs ] |
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Technical Documentation |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2018/10/11 |
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647 KB |
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