Symptom
A network adopts the OptiX BWS 1600G and with an RPC board as a Raman amplifier board. The customer uses G.656 fibers and the ODF interfaces are of the LC/PC type. By default, the RPC board of the OptiX BWS 1600G matches the G.652 fiber whose interface is of the FC/UPC type. The LC/PC interface of the fiber provided by the customer does not satisfy the requirements of high power. In addition, the FC/PC interface of a fiber is not available temporarily. After negotiation with the customer, direct splicing is adopted.
Cause analysis
The effective sections of the G.652 fiber and the G.655 or G.656 fiber, technical specifications for manufacturers, and mode field diameters of the 1500 nm wavelength (the G.652 fiber is of a bigger diameter) are different.
When two G.652 fibers are spliced, a loss is produced. The average loss is 0.02 dB.
In the case of splicing of a G.652 fiber with a G.656 fiber, the loss is 0.38 dB due to different cross-sectional areas of fibers. In this case, the splicing loss is within the permitted range for an RPC board. In the case of splicing of a G.652 fiber and a G.656 fiber, the average loss is 0.5 dB. In the case of splicing of a G.652 fiber with a G.655 or G.656 fiber whose effective section is small, a great loss is produced (as great as 2 dB). In this case, the splicing loss is out of the permitted range.
