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After reading the previous article, many friends asked, what is a single-fiber transceiver, what is a dual-fiber transceiver? What is the difference between them? Today, Xiaobo is here to learn about it.
1, single fiber transceiver
Single-fiber transceiver refers to a single-mode optical cable. The single-fiber transceiver uses only one core, and both ends are connected to the core. The transceivers at both ends use different optical wavelengths, so they can be transmitted in one core. Optical signal.
The single-fiber transceiver needs to realize both the transmitting function and the receiving function. It uses the wavelength division multiplexing technology to transmit and receive two optical signals of different wavelengths on one optical fiber.
Therefore, a single-mode single-fiber transceiver transmits through a core fiber, and both the transmitted and received light are transmitted through one fiber core at the same time. In this case, to achieve normal communication, it is necessary to distinguish between two wavelengths of light.
Therefore, the optical module of the single-mode single-fiber transceiver has two wavelengths of light emission, generally 1310nm/1550nm, so that there are differences between the two ends of the interconnection of a pair of transceivers:
One end transceiver transmits 1310 nm and receives 1550 nm.
The other end is emitting 1550nm and receiving 1310nm.
So convenient for the user to distinguish, usually with letters instead.
There are A end (1310nm / 1550nm), B end (1550nm / 1310nm).
The user must use AB pairing, not AA or BB connection.
Only the single fiber optic transceiver will be used at the AB end.
2, dual fiber transceiver
The dual-fiber transceiver uses two cores, one for transmitting and one for receiving, and the other end for the other end must be inserted in the receiving port, that is, the two ends must cross.
The dual-fiber transceiver has a TX port (transmitting port) and an RX port (receiving port). Both ports emit the same wavelength of 1310 nm, and the receiving is also 1310 nm, so the parallel two fibers are connected in cross-connection.
3. How to distinguish between single-fiber transceivers and dual-fiber transceivers?
There are currently two ways to distinguish between single-fiber transceivers and dual-fiber transceivers.
1 When the optical transceiver is embedded in the optical transceiver, the optical transceiver is divided into a single-fiber transceiver and a dual-fiber transceiver according to the number of cores of the connected optical fiber jumpers. The linearity of the fiber jumper connected to the single-fiber transceiver is a core, which is responsible for transmitting data and receiving data; and the fiber jumper connected to the dual-fiber transceiver has two cores, wherein One core is responsible for transmitting data and the other core is responsible for receiving data.
2 When the optical transceiver does not have an embedded optical module, it needs to distinguish whether it is a single-fiber transceiver or a dual-fiber transceiver according to the inserted optical module. When a single-fiber bidirectional optical module is inserted into the optical transceiver, that is, the interface is a simplex type, the optical transceiver is a single-fiber transceiver; when the optical transceiver is inserted into a dual-fiber bidirectional optical module, the interface is dual This type of transceiver is a dual-fiber transceiver.