Can some tell me what for monitoring optical power on my 7200 series router . The interface has a SFP 1000BASE-LX.

sh int gig0/0 transceiver ,doesnt give me the required information( Optical power in dBm)

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You will need the part number to determine SFP compatibility. This is from Digital Optical Monitoring - DOM, which has a link to the compatibility matrix:

DOM Support on Cisco Transeivers

Not all transceivers support DOM, a list of capable transceivers is available at:

DOM compability Matrix

How to use DOM

Following command can be used to turn on/off DOM for all transceivers type in the system

Router(config)#transceiver type all

Once enabled, DOM can be accessed via CLI using show interface transceiver command

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