Encapsul
ation
Type
Rate Standard Description
QSFP+ 40GE 40Gbase-SR4 (IEEE
802.3ba)
Uses one Rx multimode fiber and
one Tx multimode fiber to transmit
data at 40 Gbit/s over a distance
within 400 m.
40Gbase-LR4 (IEEE
802.3ba)
Uses one Rx single-mode fiber and
one Tx single-mode fiber to transmit
data at 40 Gbit/s over a distance
within 10 km.
7.2.3 Parameter Description
Transmit optical power Output optical power of an optical module when it is working properly. When two
optical modules are connected, the transmit optical power of one end must be within
the range of receive optical power on the other end.
Receive optical power Average input optical power that the receiver of an optical module can receive within
a range of bit error rate (BER = 10
-12
). The upper limit of this parameter is the
overload optical power and the lower limit is the maximum receiver sensitivity. When
two optical modules are connected, the receive optical power on one end determines
the range of transmit optical power on the other end.
Maximum receiver
sensitivity
Minimum average input optical power that the receiver of an optical module can
receive within a range of bit error rate (BER = 10
-12
). When two optical modules are
connected, the maximum receiver sensitivity on one end determines the minimum
value of transmit optical power on the other end.
Overload optical
power
Maximum average input optical power that the receiver of an optical module can
receive within a range of bit error rate (BER = 10
-12
). When two optical modules are
connected, the overload optical power on one end determines the maximum transmit
optical power on the other end.
Extinction ratio 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 optical modules. Optical modules
with a large extinction ratio may not have good quality. Qualified optical modules
should have an extinction ratio complying with IEEE 802.3.
Fiber mode Mode of optical fibers defined based on core diameters and features of optical fibers.
Optical fibers are classified into single-mode and multimode fibers. Generally, multi-
mode fibers have large core diameters and severe dispersion, so they transmit optical
signals over short distances. Single-mode fibers have small dispersion and can
transmit optical signals over long distances.
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. 741
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