Optical power meter is used to measure the absolute optical power, or by a fiber optical power relative to the depletion of the instrument.In the optical fiber system, optical power measurement is the most basic, much like the multimeter electronics;In the optical fiber measurement, optical power meter is a commonly used table heavy load.
Light power is the unit of DBM in optical transceiver or switch the instruction of the light emitting and receiving optical power, usually light emitting 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), called dynamic range, luminous power minus the receiving sensitivity is to allow the fiber CuiHaoZhi. When testing the actual luminous power minus the actual received light power of value is the fiber attenuation (db).The receiver receives the light power optimal value is to be able to receive the maximum light power – (dynamic range / 2), but usually not so good. Because each optical transceiver and optical module of dynamic range is different, so the fiber concrete can allow attenuation much depends on the actual situation, generally allow the attenuation of about 15 to 30 db.
Some instructions can only two parameters, luminous power and transmission distance sometimes shows how much per km optical fiber attenuation to 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 burn out. With the maximum transmission distance is divided by 0.5, is sensitivity, if received light power is lower than this value, the link may be blocked.
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