Home » What Are the Interface Types of Fiber Optic Modules?

What Are the Interface Types of Fiber Optic Modules?

by Nathan Zachary
Fiber Optic Modules

As we all know, optical modules have many different interface types, including FC type, SC type, LC type, ST type, etc. To realize the information exchange of different optical modules, it is necessary to connect two optical modules, and then a matching interface is required. For the interconnection of optical modules between different interfaces, it is necessary to select different connectors for connection. What are the specific fiber optic module interface types and how do connect and transmit optical modules with different interfaces, let’s take a closer look at the text!

What are the interface types of fiber optic modules?

The interface types of optical modules are FC type, SC type, LC type, ST type and KTRJ type.

1. The FC connector adopts a thread locking mechanism, which is an early and most used optical fiber active connector.

2. SC is a rectangular connector, which can be directly plugged and unplugged without screw connection. Compared with FC connector, it has a small operating space and is easy to use. Low-end Ethernet products are very common.

3. LC is a Mini-type SC connector with a smaller volume, which has been widely used in the system and is a direction for the development of optical fiber active connectors in the future. Low-end Ethernet products are very common.

4. The ST connector uses a bayonet locking mechanism. The main parameters are comparable to those of the FC and SC connectors. However, it is not widely used in the company. It is usually used in the connection of multi-mode devices. many.

5. The pins of KTRJ are made of plastic and are positioned by steel pins. With the increase of the number of insertions and extractions, the mating surfaces will be worn out, and the long-term stability is not as good as that of ceramic pin connectors.

How to connect and transmit optical modules with different interfaces

To achieve information exchange between optical modules, two optical modules must be connected, and the jumper connecting the two modules needs to match its interface before it can be inserted for transmission. For the interconnection of optical modules between different interfaces, it is necessary to select different connectors to connect, such as:

1. Single-core LC interface optical module

Single-core LC interface optical modules are BIDI optical modules. It must be noted that BIDI optical modules must be used in pairs. BIDI optical module is a single-fiber bidirectional optical module, namely BiDi. The conventional module is a dual-fiber module (two optical fibers are connected), and there are two optical fiber ports at the optical interface: the transmitting port (TX) and the receiving port (RX), while the BIDI module is a single-fiber module with only one optical fiber port and one optical fiber. Different optical signals are emitted and received inside, so BIDI optical modules must be used in pairs. In terms of appearance, the BIDI module has only one port and is connected with only one optical fiber. A single-core LC connector is required for connection.

2. Dual-core LC interface optical module

Dual-core LC interface optical modules include SFP optical modules, QSFP28 optical modules, CFP optical modules, CFP2 optical modules, QSFP+ optical modules, SFP28 optical modules, and SFP+ optical modules, which need to be connected by dual-core LC connectors.

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