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[Approaching NE] Basic Hardware Concept - Optical Fibers and Modules Highlighted

Latest reply: Sep 27, 2018 10:01:29 1705 2 1 0 0

Getting Started

At the lab, Tom was setting up a test environment and noticed that one of the port indicators failed to turn On. He tried to remedy this by removing and reinserting the port's optical module several times, but the port remained in the Down state. So, he turned to Linda.
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Precautions for Optical Fiber Interconnection

Question Answer
Can high-rate optical modules be used as a substitute for low-rate optical modules? For example, can GE optical modules be used as FE optical modules?

No.

GE optical modules used as FE optical modules may or may not work; this implementation has not been tested. It is recommended not to do so, unless optical module specifications are released to support this implementation.

Can optical modules with the wavelengths of 1310 nm and 1550 nm connect to each other?

No.

Given the same transmission rate, optical modules with different wavelengths have different transmission distances due to losses and dispersion. Therefore, the transmit and receive optical powers may not match. Moreover, such optical modules have different carrier wavelengths, which may cause signal demodulation faults.

Can single-mode optical fibers be used for multi-mode optical modules?

No.

The link cannot work in this way. Optical signals from multi-mode optical modules have a large divergence angle, and single-mode optical fibers have a small aperture. As a result, too little light can enter the single-mode optical fibers. In addition, single-mode optical fibers are long. Before the light reaches the end of the fibers, it attenuates down. Even though short single-mode optical fibers are used, the signals may still be unstable.

Can multi-mode optical fibers be used for single-mode optical modules?

It is not recommended.

Optical signals from single-mode optical modules can completely enter multi-mode optical fibers, though with high dispersion in multi-mode transmission. It is allowable in short-distance transmission. However, the optical power at the receive end increases, which may cause an optical power overload. Therefore, using single-mode optical fibers for single-mode optical modules is recommended.

Can optical modules with different transmission distances connect to each other?

It is not recommended.

Optical modules at the transmit and receive ends must have consistent transmission rates, transmission distances, transmission modes, and working wavelengths. The interface specifications of optical modules with different transmission distances vary greatly, and the optical modules with long transmission distances cost more. If optical modules with different transmission distances must be used to connect to each other, a proper optical attenuation must be set based on site requirements.

When is optical attenuation needed? When the peer end's transmit optical power exceeds the upper limit of the local end's receive optical power, an optical attenuator must be connected to the peer end to attenuate the optical signals before sending the optical signals to the local end. Optical attenuation must be used when long-distance optical modules are used in short-distance applications, especially in loopback applications. The use of optical attenuation prevents damage to optical modules caused by high optical power. An optical attenuator can work in either single-mode or multi-mode. Select a mode based on the wavelength required.
Can optical modules that are not certified by Huawei be used on Huawei devices?

No.

Optical modules work together with boards' circuit and software. The use of non-Huawei-certified optical modules, especially those with poor quality, will cause system errors.

 

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user_2790689
Created Mar 31, 2016 06:20:19

Thank you.

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faysalji
Moderator Author Created Sep 27, 2018 10:01:29

Excellent[Approaching NE] Basic Hardware Concept - Optical Fibers and Modules-2762879-1
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