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By using Dense Sub carrier Multiplexing (xDSM) Technology.

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Posted by HamidAliKhan

CWDMs can also be used to increase fiber capacity by combining 2 to 16 wavelengths onto one fiber.

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Posted by dandelo

DWDMs significantly increase fiber bandwidth by combining from 2 to 32 wavelengths onto one fiber. Make sure to use proper DWDM ITU-T lasers.

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Posted by elie

Install passive, Cross Band WDMs, DWDMs, or CWDMs.

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Posted by danielmathew

Use Bi-directional couplers that allow traffic transmission in both directions on one fiber.

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Posted by dandelo

yup xDSM & also visit the following link

http://svconline.com/cables/features/cables_global_bandwith_011007/

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Posted by Hash007

Yes xDSM can be a solution.
But now a days WDM is also on lower cost solution. and it is becoming lower and lower.

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Posted by waqqas1

It can be increased using Dense Subcarrier Multiplexing (xDSM) Technology.

For more details visit following url:

http://www.ansoft.com/news/press_release/AltraBroadband_05_01.cfm

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Posted by sagitraz