Working principle of optical fiber couplers classi

2022-07-22
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When it comes to optical fiber adapters, I believe everyone is familiar with them. They can be used in telecommunication networks, cable television networks, subscriber loop systems, and regional networks. The largest item used in passive components is separated from the optical fiber connector

optical fiber coupler, also known as splitter, connector, coupler and flange, is an element used to realize optical signal shunting/combining, or to extend optical fiber link. It belongs to the field of optical passive components. What is the working principle of optical fiber coupler? Let's get to know and have a look

[working principle of optical fiber coupler]

optical fiber coupler is a device for detachable (movable) connection between optical fibers. It connects the two end faces of optical fibers accurately, so that the optical energy output by the transmitting optical fiber can be coupled to the receiving optical fiber to the greatest extent, and it can intervene in the optical link to minimize the impact on the system. For waveguide fiber coupler, it is generally an element with Y-branch, and the optical signal input by an optical fiber can be equally divided by it. When the open angle of the branch of the coupler increases, the light leaked into the cladding will increase, resulting in increased excess loss, so the open angle is generally 30 DEG; Therefore, the length of waveguide fiber coupler cannot be too short

[introduction to the classification of optical fiber couplers]

according to the different coupling optical fibers, there are the following classifications:

SC optical fiber coupler: applied to SC optical fiber interface, it looks very similar to RJ-45 interface, but the SC interface looks more flat. The obvious difference is the contact inside. If it is 8 thin copper contacts, it is RJ-45 interface, and if it is a copper column, it is SC optical fiber interface

lc optical fiber coupler: it is applied to LC optical fiber interface and the connector connecting SFP module. It is made of modular jack (RJ) latch mechanism with convenient operation. (commonly used in routers)

fc optical fiber coupler: it is applied to FC optical fiber interface. The external strengthening method is metal sleeve, and the fastening method is turnbuckle. Generally, it is used on the ODF side (most used on the distribution frame)

st optical fiber coupler: it is used for St optical fiber interface, which is commonly used in optical fiber distribution frame. The shell is round, and the fastening method is turnbuckle. (for 10base-f connection, the connector is usually st type. It is commonly used in optical fiber distribution frame)

performance index of optical fiber coupler:

● insertion loss: ≤ 0.3dB(PC)≤ 0.2dB(UPC)< 0.2dB(APC) ≤ 0.3dB (multimode)

● return loss: ≥ 40dB(PC)≥ 50dB(UPC)≥ 60dB(APC) ≥ 35dB (multimode)

● interchangeability: ≤ 0.2db working temperature (℃): -30 - +80

● storage temperature (℃): -40 - +85

● vibration test: ≤ 0.1dB (10-60hz, 1.5mm amplitude)

● tensile strength test: ≤ 0.1dB (0-15hg tension, except for φ 0.9mm optical fiber)

● repeatability: ≥ 1000 times

conclusion: the above introduces the working principle and classification of optical fiber couplers, hoping to be helpful to you. For more relevant knowledge, please continue to pay attention to the information platform. More wonderful content will be presented for you in the follow-up

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