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difference between simplex duplex and half duplex

In the transmission of optical communication, we often hear simplex, duplex and half-duplex, as well as single-core, dual-core; single-fiber and dual-fiber, so is there any connection between the three, and what is the difference?

First of all, let’s talk about single-core and dual-core; single-fiber and dual-fiber, on the optical module, both are the same, but they are called differently. Optical modules, dual-core optical modules and dual-fiber optical modules are all dual-fiber bidirectional optical modules.

What is simplex?

Simplex refers to data transmission that only supports one-way transmission. In practical applications, there are printers, radio stations, monitors, etc. Only accept signals or commands, do not send signals.

What is half-duplex?

Half-duplex means that data transmission supports two-way transmission, but two-way transmission cannot be performed at the same time. At the same time, one end can only send or receive.

What is duplex?

Duplex refers to the transmission of data in two directions at the same time. It is a combination of two simplex communications. It requires that the sending device and the receiving device have independent receiving and sending capabilities at the same time.

In the optical module, the half-duplex is the BIDI optical module, which can transmit and receive through one channel, but can only transmit data in one direction at a time, and can only receive data after sending data.

The duplex is an ordinary dual-fiber bidirectional optical module, which has two channels for transmission, and can send and receive data at the same time.