What is an optical power meter?
People are usually able to measure familiarity with electronic multimeter, voltage, current and resistance. An optical power meter looks like and works like a multimeter. It consists of a display unit and transferred to a calibrated sensor to measure the optical power in optical fibers.
Where is it used?
Optical power meters are used broadly in the fiber optic communications. It usually comes in two types: desktop nature andHandheld type.
The desktop type has much higher resolution and is usually in the R & D applications in the laboratory, fiber optic components and plant floors.
The handheld type has a lower resolution and is in a convenient handheld footprint for easy field use. It is regularly of fiber optic cabling technicians in datacom, telecom and CATV network maintenance.
Working wavelength of the power meter
In the handheldoptical power market, are the most popular wavelengths 850nm, 1300nm, 1310nm and 1550nm. 850nm and 1300nm for multimode applications. 1310 nm and 1550 nm for single mode applications.
It is best to choose an optical power meter that is calibrated for all four wavelengths to get the most from your money. You can include both multimode and single mode applications in the network.
Calibration of fiber optic power meters
Power meters are calibrated with aCalibration standard as a NIST standard. NIST laboratories provide measurements and standards for U.S. industry.
Detector Types
The optical detector in a handheld optical power meter is for the conversion of light energy into electronic volts may be measured according to the circuit board in the unit responsible. The nature of the detector determines the wavelength range and its dynamics.
Silicon detectors can sense 350nm to 1100nm wavelengthLight. Germanium detectors can sense 750nm to 1800nm. The most popular measure InGaAs detectors is 850 nm to 1650 nm
What is momentum?
An optical power meter's dynamic range spec, you will learn what light output range can be measured effectively and properly.
When we talk about light output, we use in general, the dBm unit. 1mW as the reference light energy is defined as 0 dBm. For example, a 2 mW of light energy are defined in dBm, as 10 * log10 (2mW/1mW) = 3.0 dBm. 0.5mW and is defined indBm as 10 * log10 (0.5mW/1mW) = -3.0 dBm.
For example, a handheld optical power meter with -50 ~ +3 dBm dynamic light energy 0.0001mW can actually measure 2 mW.
Manufacturer of optical power meter
The handheld power meter market is crowded with Agilent, Anritsu, EXFO, Noyes and some other less known brand names. But this kind of product is very mature and usually you can certainly shop around.
ไม่มีความคิดเห็น:
แสดงความคิดเห็น