Modal bandwidth Bandwidth measured at a point with transmit power several dB lower than that of the
point with the peak center wavelength. Modal bandwidth reflects spectrum
characteristics of multimode fibers. The higher modal bandwidth a multimode fiber
has, the longer transmission distance the fiber supports.
Fiber diameter Diameter of the core of a fiber. According to international standards for optical fibers,
the diameter of a multimode fiber is 62.5 μm or 50 μm, and the diameter of a single-
mode fiber is 9 μm. Select optical fibers with diameters supported by the optical
modules.
Fiber class Optical signals with different wavelengths have their best working windows in
different optical fibers. To help efficiently adjust wavelengths or dispersion features of
optical fibers and change their refractive indexes, the following fiber classes are
defined: multimode fiber (G.651), common single-mode fiber (G.652), shifted
dispersion fiber (G.653), and non-zero shifted dispersion fiber (G.655). G.651 and G.
652 are commonly used fiber classes. Optical fibers of higher classes support longer
transmission distances. When selecting optical fibers for optical modules, determine
the classes of fibers based on the required transmission distances.
Connector type Type of the interface on an optical module to accommodate a fiber. Commonly used
connector types are LC (applicable to all the SFP, SFP+, and XFP modules), SC, and
MPO (applicable to 150 m QSFP+ and CXP modules). Select optical fibers with
connectors supported by the optical modules.
Transmission distance Maximum distance over which optical signals can transmit. Optical signals sent from
different types of sources can transmit over different distances because they have
different dispersion and attenuation. When connecting optical interfaces, select optical
modules and fibers according to the longest signal transmission distance.
Interface rate Maximum rate of electrical signals that an optical component can transmit without bit
errors. The interface rates defined in Ethernet standards include 125 Mbit/s, 1.25
Gbit/s, 10.3125 Gbit/s, and 41.25 Gbit/s. When connecting optical interfaces, select
optical modules and fibers based on the maximum signal transmission rate.
Center wavelength Wavelength measured at the midpoint of the half-amplitude line in the transmit
spectrum. Two connected optical modules must have the same center wavelength.
MSA Multi-Source Agreement, a non-profit organization jointly established by optical
module manufacturers. This agreement defines the structure and dimensions of optical
transceivers by referring to Optical Internetworking Forum (OIF) and International
Telecommunication Union (ITU) standards.
7.2.4 How to View Optical Module Parameters
Viewing the Hardware Description
If you know the model or type of an optical module, you can view the section "Pluggable
Modules for Interfaces" in the Hardware Description to look up parameters of the optical
module, including the center wavelength, transmission distance, fiber types supported, receive
optical power, and transmit optical power.
Huawei
AR500&AR510&AR531&AR550&1500&AR2500
Industrial Switch Routers
Hardware Description
7 Pluggable Modules for Interfaces
Issue 10 (2019-03-06) Copyright © Huawei Technologies Co., Ltd. 742
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