USB connector is an important part of optical fiber communication system. According to its function classification, there are USB connector, fiber coupler, wavelength division multiplexer, optical switch, optical attenuator, optical isolator and optical circulator. Optical fiber communication system is to the access network, broadband network, dense wavelength division multiplexing system and all-optical network direction, the USB connector technology put forward new and higher requirements. Therefore, how to grasp the USB connector technology development direction to meet the needs of the market, has become the industry's concern. This article first introduces the technical overview of the USB connector, and then the USB connector technology development direction, in general, is the miniaturization of fiber optic connectors, optical fiber coupler broadband, wavelength division multiplexer intensive, optical switch And the integration of USB connectors, and discussed them in a superficial manner.

First, the technical overview of passive devices

1. Classification and application

USB connector a wide range of structured, generally according to the function of the device classification.

USB connector A device that has a connection function in an optical fiber communication line. In addition to the fixed connector between the cable, mostly single-core or multi-core active connector for fiber optic cable and optical patch panel (ODF) connection, optical patch panel and optical connection.

The USB connector has a splitter or coupling function in the fiber optic communication line. According to its port configuration, it can be divided into tree coupler and star coupler, generally by a single 1 × 2 (Y type) coupler and 2 × 2 (X type) coupler cascade, with In a variety of fiber optic networks, such as fiber optic cable, local area network (LAN) and so on.

Wavelength Division Multiplexers A device that can multiplex / demultiplex a wavelength in an optical fiber communication line. According to the number of multiplexed wavelengths, it can be divided into two wavelength multiplexers and multi-wavelength multiplexers. According to the interval between multiplex wavelengths, it can be divided into coarse wavelength division multiplexer (CWDM) and dense wavelength division multiplexing (DWDM) for a variety of wavelength division multiplexing systems, fiber amplifiers and so on.

The optical switch has an optical path switching function in an optical fiber communication line. (1 × N) and matrix optical switch (N × N), usually by a single 1 × 2 or 2 × 2 optical switch cascade, for the backup Lines, test systems and all-optical networks.

Optical attenuator A device that attenuates a portion of the optical signal energy as required in an optical fiber communication line. According to the attenuation of the adjustable, but also can be divided into fixed attenuator and adjustable attenuator.

An optocoupler that allows an optical signal to be transmitted unidirectionally only in an optical fiber communication line.

A device that allows an optical signal to travel only along a fixed path