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Could a 10G SFP+ SR units be applied to OM2 62.5/125 m multimode fiber?
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No, it's recommended for use in the OM3 50/62.5 m multimode fiber. Firstly, the bandwidth for OM3 are higher than OM2 ; Secondly, due to diameter core for 62.5/125m is larger than a 50 / 125 m fiber , when transmission in 62.5/125m multi-mode fiber , the actual output optical power is higher than that in the 50 / 125 m fiber. While the Tx power range for SFP + SR is -5~-1dBm, the high TX output power may lead to RX warning, therefore we does not recommend that customers use the SFP + SR products in 62.5/125m OM2 MMF;
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What is the rate compatiblility difference for 10G products w/ and w/o CDR?
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IIn general, 10G products with CDR can only support fixed rate or frequency multiplication rate, for example a 10G unit with CDR compatible rate ranges from 9.95~11.3Gb/s, make a 8.5G CDR, it's compatible with the rate of 2.125G/4.25G/8.5G; 10G products without CDR, compatible rate range can be covered with 1~11.3Gb/. From the point of rate, the compatibility for non-CDR functionality product is better.
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What is the wavelength range of CWDM products? How to define central wavelength?
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For CWDM product, full temperature range refers to 6.5nm's difference above or below the central wavelength , it is defined as 1xx1, the center wavelength of the 18 channels coarse wavelength respectively are : 1271nm, 1291nm, 1311nm,... 1611nm.
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What measures can be introduced to prevent the APD damage when using a 80km ( long distance) SFP+/XFP in distance less than 30km?
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When the transmission distance is less than 30 km, the link loss is approximately below 7.5dBm which lead to the Rx receive power ≥-7dBm, this could cause damage to the APD, so that when the transmission distance is less than 10km, suggest to add a 10dB attenuater, when the transmission distance is between 10~30km, it is recommended to use a 5 ~ 7 dB attenuater help to avoid APD devices in receiving end from being damaged due to overload.
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How to choose a 10G transceiver when the transmission distance is 40~60km?
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There are two standard products 40km and 80km for SFP+/XFP, when the transmission distance is within 40km, it is recommended to use the SFP+/XFP 40km transceiver; when the transmission distance is over 40km, a 80km transceiver is recommended.