What Is A Optical Power Meter

Used to measure the absolute Optical Power Meter or loss of some fiber optical power relative. Measuring the optical power in fiber optic systems is the most basic, very much like the electronics in the multimeter. Measurement of the optical fiber, optical power meter heavy duty commonly used table. Absolute power by measuring the emission-side machine or optical network, a power meter will be able to evaluate the performance of light-side equipment. Use a combination of optical power meter and stabilized light source, capable of measuring connection loss, test continuity, and help evaluate fiber link transmission quality.

Optical power in dbm, light-emitting and receiving optical power, usually light-emitting less than 0dbm, the receiver can receive the minimum optical power is called the sensitivity fiber-optic transceiver or switch instructions, to receive the maximum handheld optical power meter lessto the sensitivity of the value of the units are db (dbm dbm = db), known as the dynamic range of light-emitting power minus the receiver sensitivity is to allow the fiber attenuation value. Test the actual light-emitting power minus the actual value of the received optical power is the fiber attenuation (db). The receiver receives the optical power value is able to receive the maximum optical power of - (dynamic range / 2), but generally not so good. Each of the dynamic range of optical transceivers and optical modules, fiber concrete to allow the attenuation of how much depends on the actual situation. In general the attenuation allowed is about 15-30db.

Some instructions only two parameters of the luminous power and transmission distance, and sometimes attenuation per kilometer of optical fiber transmission distance calculated, mostly 0.5db/km minimum transmission distance divided by 0.5, is capable of receiving the maximum lightpower, received optical power higher than this value, the optical transceivers may be burned. Divided by 0.5, the maximum transmission distance is the sensitivity, if the received optical power is below this value, the link may be unreasonable.

Fiber connection in two ways, a fixed connection is a connection activity, a fixed connection is weld, using special equipment by the discharge, will melt the fiber so that the two fiber optic connectors together, the advantage is small attenuation, the disadvantage is* complex and inflexible. Active connection through the connector, usually in connection pigtail on the ODF, the advantage is * simple flexibility drawback is that the attenuation of large, in general, the attenuation of an active connection is equivalent to one kilometer fiber. Fiber attenuation estimation: including fixed and active connections per kilometer of fiber attenuation 0.5db, if the active connection is quite small, this value is 0.4db, pure fiber does not include an active connection can be reduced to 0.3db, the theoretical value pure fiber 0.2db/km; and for insurance most cases from 0.5.

Fiber-optic test TX and RX must be tested in the single fiber case because only one fiber, so we have only tested once. Single fiber of the principle according to production company stresses is wavelength division multiplexing, but I think that the higher the possibility of using optical fiber coupler.

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