Three Important Parameters on Optical Modules
The three primary parameters of an optical module are transmission rate, wavelength, and optical power.
Transmission Rate
The transmission rate refers to the speed at which the optical module can send or receive data, typically measured in megabits per second (Mb/s) or gigabits per second (Gb/s). Common rates include 1G, 10G, 25G, 40G, 100G, and 400G. This parameter determines the bandwidth capacity of the network and ensures compatibility with the connected devices and network infrastructure .
Wavelength
The wavelength is the color of light used for signal transmission, measured in nanometers (nm). Typical wavelengths are 850nm for multimode fiber (short distance), 1310nm for single-mode fiber (medium distance), and 1550nm for long-distance single-mode transmission. The wavelength affects the type of fiber used and the achievable transmission distance .
Optical Power
Optical power indicates the intensity of the light emitted by the transmitter and the sensitivity of the receiver. It is usually expressed in milliwatts (mW) or decibels-milliwatts (dBm). Key aspects include average optical power, which represents the typical output under normal operation, and extinction ratio, which measures the ability to distinguish between logical "1" and "0" signals. Proper optical power ensures reliable signal transmission over the intended distance . These three parameters—transmission rate, wavelength, and optical power—are fundamental for selecting an optical module that meets network performance, distance, and compatibility requirements. Additional parameters, such as fiber type, connector type, and operating temperature, further refine module selection for specific applications .
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