The Main Parameters of Fiber Optic Transceiver
11.12.21
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Data Rate: the number of bits transmitted per second.
Connector Type: Type of the interface on an optic transceiver to accommodate a fiber. The Commonly used connector types are LC connector (applicable to QSFP+, SFP, SFP+, SFF, and XFP transceivers), SC connector (applicable to BIDI SFP, GBIC, X2,XENPAK,1×9 transceivers), ST and FC connector (applicable to1x9 transceivers) ,MPO connector (applicable to QSFP+ SR4, and CXP modules).
Fiber mode: Mode of optical fibers defined based on core diameters and features of optical fibers. Optical fibers are classified into single-mode (SMF) and multi-mode fibers (MMF). The multi-mode fibers have large core diameters and can transport light in multiple modes. However, the inter-mode dispersion is greater so they are used to transmit optical signals over short distances. Single-mode fibers (SMF) have a small core size and can transmit light in only one mode with a small dispersion, so they can transmit optical signals for long-reach communication distances.
Central wavelength: central wavelength represents the wave band used for optical signal transmission. At present, there are mainly three central wavelengths for common fiber transceiver modules: 850 nm, 1310 nm, and 1550 nm, respectively representing three wavebands.
Transmission distance: the maximum distance over which optical signals can transmit. Optical signals sent from different types of sources can transmit over different distances due to negative effects of optical fibers, such as dispersion and attenuation. When connecting optical interfaces, select optical modules, and fibers based on the maximum signal transmission distance.
Optical Transmit power: Output optical power of an optic transceiver when it is working properly. When two optical transceivers are connected, the transmit optical power of one end must be within the range of receive optical power on the other end.
Receiving sensitivity: the power at which the receiver of a fiber optic transceiver can receive optical signals within a range of bit error rate (BER = 10-12), in dBm.
Extinction ratio: the Minimum ratio of the average optical power with signals transmitted against the average optical power without signals transmitted in complete modulation mode. The extinction ratio indicates the capability of an optical module to identify signal 0 and signal 1. This parameter is a quality indicator for fiber optic transceivers.
Eye diagram: an oscilloscope display in which a digital signal from a receiver is repetitively sampled and applied to the vertical input, while the data rate is used to trigger the horizontal sweep.
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