Features of SF Connector Optical Interface for Parallel Modules

To reduce the size and cost of optical communication systems for high-capacity optical communication networks and large-scale data processing systems such as the high-end routers employing high-speed optical data transmission to replace the conventional electrical transmission, improvement in density and working cost for large-scale complex optical fiber wiring in the systems is required.

That has created a high demand for a compact multi-fiber optical connector that allows high-density optical fiber connection as an important component for optical fiber wiring. NTT has developed an SF connector that can offer such connection as well as high-reliability by using a PC connection.

2.125Gbps SFP Optical Transceiver

Here, we describe an SF connector optical interface for parallel (multi-channel) optical modules used for high-speed optical data transmission as an application of this SF connector technology, taking advantage of the design features of the SF connector, including lack of ferrule, small and thin form factor, and ease of connection and disconnection.

Figure 1. Structure of SF connector optical interface

The SF connector optical interface developed by the NTT laboratories comprises an SF connector plug with optical fibers (normally multi-mode fibers) and a receptacle that is installed in the module body. The receptacle has micro-holes for precise positioning the ends of the fibers in relation to optical devices.

Figure 2 Features of SF Connector for Parallel Module

This optical interface brings the ends of the fibers into a position very close to the optical devices, thus implementing an efficient optical coupling between the optical fiber and optical device without using a micro-lens. Furthermore, the SF connector plug is thin, allowing the receptacle to also be thin. That allows the receptacle to be mounted on the top of the module, thus reducing the footprint of the module by about a half of conventional modules.

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