Cisco CWDM-GBIC-1490 Руководство по установке и спецификации - Страница 13
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Table 13
CWDM SFP Module Optical Parameters
Parameter
Symbol
λ
Transmitter center
C
wavelength
Side-mode
SMSR
suppression ratio
Transmitter
P
out
optical output
power
Receiver optical
P
in
input power
(BER <10-12 with
PRBS 2-7-1)
Receiver optical
P
in
input power
(BER <10-12 with
PRBS 2-7-1)
λ
Receiver optical
in
input wavelength
Transmitter
OMI
extinction ratio
Dispersion
–
penalty at 100 km
Dispersion
–
penalty at 100 km
Parameters are specified over-temperature and at end-of-life unless otherwise noted.
When shorter distances of single-mode fiber are used, it may be necessary to insert an in-line optical
attenuator in the link to avoid overloading the receiver.
Mode-Conditioning Patch Cord Description
A mode-conditioning patch cord can be used with the WS-G5486 to allow reliable laser transmission
between the single-mode laser source on the GBIC module and a multimode optical fiber cable.
When an unconditioned laser source designed for operation on single-mode optical fiber is directly
coupled to a multimode optical fiber cable, an effect known as differential mode delay (DMD) might
result in a degradation of the modal bandwidth of the optical fiber cable.
This degradation results in a decrease in the link span (the distance between a transmitter and a receiver)
that can be supported reliably. The effect of DMD can be overcome by conditioning the launch
characteristics of a laser source. A practical means of performing this conditioning is to use a device
called a mode-conditioning patch cord.
Gigabit Interface Converter (GBIC) Module and Small Form-Factor Pluggable (SFP) GBIC Module Installation Information and Specifications
OL-5067-08
Minimum
Typical
Maximum
(x–4)
–
(x+7)
30
–
–
0
–
5.0
–28
–
–7.0
–29
–
–7.0
1450
–
1620
9
–
–
–
–
3
–
–
2
Mode-Conditioning Patch Cord Description
Units
Notes/Conditions
nm
Available center wavelengths are 1470,
1490, 1510, 1530, 1550, 1570, 1590, and
1610 nm
dB
–
dB
Average power coupled into single-mode
fiber
dB
@ 2.12 Gbps, 140° F (60° C) case
temperature
dB
@ 1.25 Gbps, 140° F (60° C) case
temperature
nm
–
dB
–
dB
@ 2.12 Gbps
dB
@ 1.25 Gbps
13