Optical power meter is a piece of common optical instrument, widely used in fiber-optic systems to measure the input optical power of an optical signal inputted to the power meter, as schematically shown in Figure 1. This is the traditional Input-Type power meter (Type-I), which reports the power to its input port only.

Figure 1: Type-I Power Meters
We can also build a dual-port optical power meter (Type-II), which contains an Input port and an Output port, as schematically shown in Figure 2. This two-port power meter can report the optical powers tothe input and from output ports. This type of optical power meter is quite useful in production floor and verification. This type of optical power meter is also named as I/O power meter.

Figure 2: Type-II Power Meters


Figure 3: I/O Power Meters
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