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Company news about Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on?

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Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on?

2025-07-31

Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on?


In theory, the loss of single-mode fiber at a wavelength of 1490nm is greater than that at a wavelength of 1577nm. However, when the 10G PON is turned on, the output power of the OLT at 1490nm/1577nm is basically the same, but there may be a situation where the optical modem ONU at 1490nm receives light normally while the optical modem at 1577nm receives light too low. If it has been confirmed that the device emits light normally at 1577nm, the problem is likely caused by fiber macro bending in the ODN (Optical Distribution Network). The specific explanation is as follows:


The difference in the impact of macro bending on different wavelength losses. Macro bending refers to the significant bending of optical fibers during installation or use. When a fiber undergoes macro bending, the loss of light of different wavelengths at the bend varies. From the OTDR test curve provided, it can be seen that at the location of the macro bending event, the loss at 1490nm is 0.896dB, while the loss at 1577nm is as high as 1.719dB. This indicates that light with a wavelength of 1577nm is more sensitive to macro bending and is more prone to significant energy loss at the macro bending point, resulting in low received optical power at the receiving end. Please also include 1310nm and 1610nm in the diagram for comparison.

 

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Company news about-Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on?

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Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on?

2025-07-31

Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on?


In theory, the loss of single-mode fiber at a wavelength of 1490nm is greater than that at a wavelength of 1577nm. However, when the 10G PON is turned on, the output power of the OLT at 1490nm/1577nm is basically the same, but there may be a situation where the optical modem ONU at 1490nm receives light normally while the optical modem at 1577nm receives light too low. If it has been confirmed that the device emits light normally at 1577nm, the problem is likely caused by fiber macro bending in the ODN (Optical Distribution Network). The specific explanation is as follows:


The difference in the impact of macro bending on different wavelength losses. Macro bending refers to the significant bending of optical fibers during installation or use. When a fiber undergoes macro bending, the loss of light of different wavelengths at the bend varies. From the OTDR test curve provided, it can be seen that at the location of the macro bending event, the loss at 1490nm is 0.896dB, while the loss at 1577nm is as high as 1.719dB. This indicates that light with a wavelength of 1577nm is more sensitive to macro bending and is more prone to significant energy loss at the macro bending point, resulting in low received optical power at the receiving end. Please also include 1310nm and 1610nm in the diagram for comparison.

 

latest company news about Why is there a situation where 1490nm reception is normal and 1577nm reception is too low when 10G PON is turned on? 0

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