Low cutoff G.657-compatible fiber for data center interconnects operating in the 1064 and 1310 nm windows

Scott R. Bickham; Pushkar Tandon; Snigdharaj K. Mishra; Ming-Jun Li; Ewa Simpanen; Tamás Lengyel; Johan S. Gustavsson; Anders Larsson

doi:10.1117/12.2547869

28 February 2020 Low cutoff G.657-compatible fiber for data center interconnects operating in the 1064 and 1310 nm windows

Scott R. Bickham, Pushkar Tandon, Snigdharaj K. Mishra, Ming-Jun Li, Ewa Simpanen, Tamás Lengyel, Johan S. Gustavsson, Anders Larsson

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Proceedings Volume 11286, Optical Interconnects XX; 112860C (2020) https://doi.org/10.1117/12.2547869
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Optical interconnects in data centers have traditionally used 850 nm GaAs-based vertical-cavity surface-emitting lasers (VCSELs) in combination with multimode fiber, having a reach up to 100 m in length. Longer links typically use standard single-mode fiber in conjunction with either InP-based edge-emitting lasers or silicon photonic transmitters operating in the 1310 nm or 1550 nm window. Single-mode GaAs-based VCSELs operating at 1064 nm offer another path for achieving longer system reach. Potential advantages of these VCSELs include better power efficiency, modulation speeds reaching 50 Gbps and large-scale fabrication volumes. The longer wavelength is also beneficial due to the lower attenuation and chromatic dispersion of optical fibers at that wavelength. However, one practical issue for single-mode transmission is that the G.657 standard for single-mode fiber requires that the 22-meter cable cutoff wavelength be less than 1260 nm, and these fibers are typically few-moded at 1064 nm. The large differences between the group velocities of the LP01 and LP11 modes can lead to degradation of the system performance due to multi-path interference if the higher order modes are present. To resolve this quandary, we have designed and validated the performance of a new optical fiber which is single-moded at wavelengths less than 1064 nm, but also has G.657- compliant mode field diameter and dispersion characteristics that enable it to be used in the 1310 nm window.

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Scott R. Bickham, Pushkar Tandon, Snigdharaj K. Mishra, Ming-Jun Li, Ewa Simpanen, Tamás Lengyel, Johan S. Gustavsson, and Anders Larsson "Low cutoff G.657-compatible fiber for data center interconnects operating in the 1064 and 1310 nm windows", Proc. SPIE 11286, Optical Interconnects XX, 112860C (28 February 2020); https://doi.org/10.1117/12.2547869

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KEYWORDS

Vertical cavity surface emitting lasers

Dispersion

Single mode fibers

Signal attenuation

Data centers

Optical fibers

Multimode fibers

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