Classification of optical modules
Let me talk about some of the most commonly used optical modules. Now most of them are single-mode optical modules, and the multi-mode optical modules are used less. Today we mainly talk about single-mode optical modules. Optical modules are divided into 155M/622M/1.2/2.12 according to the rate. /4.25G/6G/8G/10G, and the latest 100G optical module, which is said to be used for 5G networks. 1.25G and 10G are widely used in the market now. The transmission distance is 1KM/2KM/5KM/10KM/15KM/20KM/30KM/40KM/50KM, and the most used in the market is 5KM and 10KM.
The optical module is basically based on LC, which can be divided into single fiber and double fiber. When the fiber core resources are not enough, the single fiber optical module can be used. Yes, the fiber jumper is also fast and convenient, which is less used and more expensive. The most commonly used optical module is the dual-core optical module. The optical module needs two LC layer fibers for receiving and sending separately. Therefore, this kind of optical alignment is more troublesome. It is necessary to check whether there is receiving or receiving light at both ends. It is best to align the light. Two people are in a group. They don’t need to run back and forth. They need to be equipped with some optical equipment, such as a red light pen and an optical power meter. It is best to have a walkie-talkie in places where there is no signal to facilitate communication.
How to configure the optical module for the device
A switch (provided that it is designed to use optical fiber transmission) is equipped with two optical modules, because the optical fiber is at both ends, the end point (convergence layer switch) uses an optical module, and the starting point (core) also uses an optical module. Modules are excluded for stacking. Therefore, a set of switches needs to be equipped with two optical modules. This is the way for weak current switches to configure optical modules.
The communication 3G or 4G network is also configured in the same way, but the device names are different. The communication signal devices are called BBU and RRU. The BBU is equivalent to the core switch. The functions of these two devices are completely different, and the RRU is equivalent to the aggregation switch. The optical modules are all the same LC two-core optical modules, and they are all the same.
How to Prepare Optical Module Pigtail
Let me first talk about the commonly used models of the lower layer fibers: LC-LC; LC-FC; LC-SC; FC-FC; FC-SC; SC-SC, etc. These are the more commonly used models. There is also the length of the pigtail: 1, 2, 3, 5, 10, 15, 20, 30 meters, the most commonly used are 1, 3, 5, 10, 15 meters, the length is based on the equipment and the ODF box determined by distance.
The number of pigtails depends on the optical module used. There are two single-core optical modules, and four if it is a dual-core optical module. The mainstream is still a dual-core optical module. There are 4 pieces in total. The LC-LC pigtails are basically used in intelligent engineering, and LC-FC pigtails are also used. This depends on how the designers configure this piece, but now many are using LC-FC. This kind of fiber optic disk has many flanges, which are easy to find in the market and convenient for later maintenance and replacement.
The preparation of BBU and RRU pigtails for communication 3G/4G is also the same. There are 2 BBUs and 2 RRUs each, which add up to 4. Basically, they all use dual cores and the pigtail type LC-FC for communication equipment.
