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Optical fiber is through light guide to transmit signals, not conductive, not afraid of lightning, so there is no need for grounding protection, we according to the transmission mode of light in the optical fiber is divided into: multimode optical fiber and single-mode optical fiber.

For us users, you can remember the multi-mode and single-mode names.

Multimode fiber: can transmit light in multiple modes.

Single-mode fiber: light that can only be transmitted in one mode.

The transmission distance of multimode fiber is relatively close, and the transmission distance of single-mode fiber can reach dozens of times that of multimode fiber. The price of single-mode fiber is generally higher than that of multimode fiber.

Other advantages of using fiber optics include:

1. When the transmission distance of the information point is greater than 100m, if you choose to use copper cable. Repeaters must be added or network equipment and weak power rooms must be added to increase costs and hidden troubles, which can be easily solved with optical fiber.

2. There are a large number of electromagnetic interference sources in specific working environments (such as factories, hospitals, air-conditioning rooms, power rooms, etc.). Optical fiber can operate stably in these environments without electromagnetic interference.

3. There is no electromagnetic leakage in the optical fiber, so it is very difficult to detect the signals transmitted in the optical fiber. It is a good choice in places with high level of secrecy (such as military, R & D, audit, government, etc.).

4. In the environment with high demand for bandwidth, which is more than 1G, optical fiber is a good choice.

In the process of practical application, single-mode optical fiber is used if the distance is far; multimode optical fiber can be used if the distance is close, and optical modules are needed for optical fiber transmission, single-mode optical modules for single-mode optical fibers and corresponding multimode optical modules for multimode optical fibers. Generally, the price of single-mode optical module is higher than that of multimode optical module.

A little knowledge about single-mode fiber and multimode fiber used in optical module

1. What is the difference between single-mode fiber and multimode fiber?

Single-mode fiber uses solid-state laser as light source; multimode fiber uses light-emitting diode as light source; single-mode fiber has wide transmission band and long transmission distance, but the cost is high because it needs laser source; multimode fiber has low transmission speed and short distance, but its cost is relatively low; single-mode fiber core diameter and dispersion are small, allowing only one mode transmission; multimode fiber core diameter and dispersion are large, allowing hundreds of modes of transmission.

2. What is the difference between single-mode optical module and multi-mode optical module?

Answer: the working wavelength of the multimode optical module is 850nm; the working wavelength of the single-mode dual-fiber optical module is generally 1310nm and 1550nm; the devices used in the single-mode optical module are twice that of the multimode optical module, so the overall cost of the single-mode optical module is much higher than that of the multimode optical module; the transmission distance of the single-mode optical module can reach 160km; the transmission distance of the multimode optical module can reach 2km.

3. Can multimode fiber be used with single-mode optical module?

First of all, multimode and single-mode converters must have corresponding wavelength and optical transceiver functions in order to achieve photoelectric conversion. Secondly, the core diameters of single-mode fiber and multimode fiber are very different, which will lead to too large insertion loss when they match. Therefore, the use of multimode fiber and single-mode optical module can not guarantee the effect.

This is the end of the sharing of this article. For more information about the communications industry, please visit the official website of Yi Tianguang Communications. Thank you for your support.

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