Tip of the Week – 03 Mar 2011
Tip of the Week:
Fiber connectors are available with three different types of end face polish, PC (physical contact flat), SPC (super physical contact), UPC (ultra physical contact), APC (angle physical contact).Â These different polish typesÂ identifyÂ the amount of curvature that is placed onto the connector end face during the manufacturing process. The curvature primarily determines the amount of optical power that is reflected back at the connectionÂ when two connectors are mated.Â Also, the less reflected power that occurs, the lower the connector insertion loss (except for APC).
In general, typical reflectance specs are as follows (however individual manufactures may vary from these values):
PCÂ Â Â < -30 dB
SPC < -40 dB
UPC < -50 dB
APC < -60 dB
UPC connectors are now commonly used for all single mode applications including high speed and DWDM networks.Â
Â APC are typically only used at the transmit end of high output power lasers found in many PON and video distribution networks. Because of the angle polish, the APC connector has the best reflectance values but also has a higher insertion loss than UPC connectors.It should be noted that APC connectors should only be mated with other APC connectors.Â Damage to the connector may occur if an APC connector is mated with a non APC type.Â The APC connector boot color is green in order to identify it; non APC connector bootâ€™s are blue (single mode fiber).When specifying connector polish, the polish acronym is written after the connector type.Â For example, SC type connector with ultra polish is written as SC-UPC or SC/UPC.
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To learn more about this topic and otherÂ fiber optic network topics
,Â refer to my following books (publisher McGraw-Hill):
Did you miss last weekâ€™s Tip?Â If so feel free to peruse this monthâ€™s archived Tips at https://www.telecomengineering.com/About_us/Tip_of_week/tipofweek.htm
For information about our products and pricing contact us at toll free 1-888-250-1562 .
If you have any questions regarding this tip or other fiber networking concerns, please feel free to email me at BChomycz@TelecomEngineering.com
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Bob Chomycz, P.Eng.
Telecom Engineering, Inc.Â
Toll Free:Â 1.888.250.1562
The contents of this email is protected by copyright law and is intended for the private use of the designated individual named above. Unauthorized distribution and/or publishing of this content is prohibited. The information in this email is intended as a general guideline only and is not to be used in actual network engineering design.Â Please contact us for proper design values for your network.