Optical port
The optical port is an abbreviation of the optical fiber interface.
Also known as G port (meaning G fiber port)
Optical port: A fiber-optic bandwidth interface used in large equipment such as equipment rooms and cabinets.
Fibers can be used for audio (sound card with light output), network (fiber as a transmission medium), disk (fiber instead of cable for data transmission), and more.
Optical fibers can be divided into single-mode fibers and multimode fibers. The differences are as follows:
Single mode fiber and multimode fiber can be easily discriminated from the size of the core. The core of a single-mode fiber is small, about 4 to 10 um, and only transmits the main mode. This completely avoids modal dispersion and makes the transmission band wide.
The transmission capacity is large. This fiber is suitable for high-capacity, long-distance fiber-optic communications. It is an inevitable trend in the future development of optical fiber communication and lightwave technology.
Multimode fibers are further classified into multimode abrupt fibers and multimode graded fibers. The former has a larger core diameter and more transmission modes, so the bandwidth is narrower and the transmission capacity is smaller;
In the latter core, the refractive index decreases as the radius increases, and a relatively small modal dispersion can be obtained, so that the frequency band is wider and the transmission capacity is larger. Currently, the latter is generally applied.
Since the transmission speeds of different modes of light in a multimode fiber are different, the transmission distance of the multimode fiber is short. Single-mode fiber can be used in non-relay optical communication.
In the theory of optical fiber communication, the optical fiber has single mode and multimode, and the difference lies in:
1. Single-mode fiber has a small core diameter (about 10m), allowing only one mode of transmission, low dispersion, and working at long wavelengths (1310nm and 1550nm), which is relatively difficult to couple with optical devices.
2. The multimode fiber has a large core diameter (62.5m or 50m), allowing transmission in hundreds of modes, large dispersion, and operating at 850nm or 1310nm. Coupling with optical devices is relatively easy.
For the optical module, strictly speaking, there is no single mode or multiple modes. The so-called single-mode, multi-mode module refers to the optical device used by the optical module to match the fiber to obtain the best transmission characteristics.
Generally, there are the following differences:
1. Single-mode modules generally use LD or narrow-spectrum LEDs as the light source. The size of the coupling components is good with single-mode fiber. When transmitting with single-mode fiber, it can transmit longer distances and the price is higher.
2. Multi-mode modules generally use lower-priced LEDs as the light source. The size of the coupling components is well matched with multimode fibers, and the price is relatively cheap.
The electrical port is relative to the optical port and refers to the physical characteristics of the fire extinguisher. It mainly refers to the copper cable and is the processed electrical signal. Currently, the common network interfaces include 100M electrical ports and Gigabit electrical ports.
Simply put, the electrical port is an ordinary network cable interface, the general speed is 10M or 100M, and some support 1000M. The maximum distance of the electrical port is 100 meters.
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