Notes of optical power meter

Notes of optical power meter

The optical power unit of optical power meter is DBM, in optical transceiver or switch the instruction has its light emitting and receiving optical power, usually light is less than 0 DBM, the receiver can receive the minimum light power called sensitivity, can receive the maximum light power minus the sensitivity of the unit is the db (DBM – DBM = db), as the dynamic range, light power minus the receiving optical fiber CuiHaoZhi sensitivity is allowed.When testing the actual luminous power minus the actual received light power of value is the fiber attenuation (db).End receives the light power optimal value is to be able to receive the maximum light power – (dynamic range / 2), generally do not so good.The dynamic range of each module optical transceiver and light, with optical fiber concrete can allow attenuation how much depends on the actual situation.Generally allow the attenuation of about 15 to 30 db.
Some specifications can only two parameters, luminous power and transmission distance sometimes shows how much per km optical fiber attenuation calculate the transmission distance, mostly is 0.5 db/km.With minimum transmission distance divided by 0.5, which is able to receive the maximum light power, if the receiving optical power is higher than the value, optical transceiver may be burned.With maximum transmission distance is divided by 0.5, that is, sensitivity, if received light power is lower than this value, the link may be blocked.

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