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Knowledge of optical splitter

In the optical network topology, the emergence of optical splitters (optical splitters) helps users maximize network performance. An optical splitter is a passive optical device that can split an optical signal into multiple optical signal outputs, including one or two input terminals and multiple output terminals. When the optical network system needs to couple and distribute optical signals, an optical splitter can be used to achieve this. This article contains the following:

  • Optical splitter working principle
  1. Light attenuation and calculation method of optical splitter
  2. Optical splitter self-loss measurement 4. Optical splitter type: FBT splitter and PLC splitter comparison 5. PLC optical splitter selection guide: common packaging forms and application range 6. Optical splitter in Application in PON Networks: Comparison of Centralized Distribution and Cascaded Distribution

1. Definition and working principle of optical splitter

An optical splitter, also called an optical splitter, is an integrated waveguide optical power distribution device, and its function is to realize the splitting of optical signals. For example, a 1×4 optical splitter can divide one input optical signal into four output optical signals in equal proportions, and transmit them in four different channels. Nowadays, optical splitters are widely used in passive optical networks (such as EPON, GPON, BPON, FTTX, FTTH, etc.) and play an important role.


Optical splitter working principle

When an optical signal is transmitted in a single-mode fiber, the optical energy cannot be completely concentrated in the fiber core, and a small amount of optical energy is propagated close to the fiber cladding. In general, when the distance between the cores of two optical fibers is close enough, the optical signal transmitted in one optical fiber can enter the other optical fiber, that is, the optical signal can be redistributed in the two optical fibers, which is exactly The origin of the optical splitter.


For example, a 1×4 optical splitter can distribute the optical signal in one optical fiber to four optical fibers in equal proportions. In fact, in simple terms, it is to distribute 1000Mbps bandwidth to four families equally, and each family can use a network with 250Mbps bandwidth.


2.How much does the light decay of the optical splitter? How to calculate?

  • Optical power loss is related to the number of optical branches (each 1:2 splitting produces a loss of ~3.5dB) •The loss of optical power determines the distance that can be transmitted •Bandwidth vs. cost: the average available bandwidth per household depends on Depending on the size of the optical division ratio, the larger the optical division ratio, the lower the shared cost of OLT per household