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Can the positions of the A and B ends of a single-mode single-fiber optical transceiver be interchanged?

Single-fiber optical transceiver: data received and sent is transmitted on one optical fiber. As the name suggests, single-fiber equipment can save half of the optical fiber, that is, data reception and transmission can be realized on one optical fiber, which is very suitable in places where optical fiber resources are tight. So, can the positions of the A and B ends of the single-mode single-fiber optical fiber transceiver be interchanged?

It can be interchanged, but it will affect the use. The A side is 1550 wavelengths, and the B side is 1330 wavelengths! This is the correct pairing and use, and it is easy to use. If the positions are interchanged, it will affect the use!

The A-side is 1310nm, and the B-side is 1550nm. In this way, there will be differences between the two ends of the interconnection of a pair of transceivers. One end of the transceiver transmits 1310nm and receives 1550nm. The other end is transmitting at 1550nm and receiving at 1310nm. Users must use AB pairing. AA or BB connection is not possible.

One end of the single-mode fiber optic transceiver is connected to the optical transmission system, and the other end (user end) is an Ethernet interface. The main principle is to realize communication through photoelectric coupling.

The single-mode single-fiber transceiver transmits through a core optical fiber, so the transmitted and received light is transmitted through one optical fiber core at the same time.

A single-mode transceiver can cover a range from 20 kilometers to 120 kilometers. Due to the difference in transmission distance, the transmit power, receive sensitivity and wavelength of use of the fiber optic transceiver itself will also be different.

For example, the transmit power of a 20-kilometer fiber optic transceiver is generally between -15 and -7dB, the receiving sensitivity is -30dB, and the wavelength of 1310nm is used; while the transmit power of a 120-kilometer fiber transceiver is mostly between -5 and 0dB, and the receiving sensitivity is between -5 and 0dB. is -38dB, using a wavelength of 1550nm.

Summary: The single-mode single-fiber optical fiber transceiver adopts the technology of wavelength division multiplexing, and the wavelengths used are mostly 1310nm and 1550nm. However, since there is no unified international standard for single-fiber transceiver products, products from different manufacturers may be incompatible when interconnected. In addition, due to the use of wavelength division multiplexing, single-fiber transceiver products generally have the characteristics of large signal attenuation. . At present, most of the optical fiber transceivers on the market are dual-fiber products, which are relatively mature and stable, but require more optical fibers.