13
Gigabit Interface Converter (GBIC) Module and Small Form-Factor Pluggable (SFP) GBIC Module Installation Information and Specifications
OL-5067-08
Mode-Conditioning Patch Cord Description
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.
Table 13 CWDM SFP Module Optical Parameters
Parameter Symbol Minimum Typical Maximum Units Notes/Conditions
Transmitter center
wavelength
λ
C
(x–4) – (x+7) nm Available center wavelengths are 1470,
1490, 1510, 1530, 1550, 1570, 1590, and
1610 nm
Side-mode
suppression ratio
SMSR 30 – – dB –
Transmitter
optical output
power
P
out
0 – 5.0 dB Average power coupled into single-mode
fiber
Receiver optical
input power
(BER <10-12 with
PRBS 2-7-1)
P
in
–28 – –7.0 dB @ 2.12 Gbps, 140° F (60° C) case
temperature
Receiver optical
input power
(BER <10-12 with
PRBS 2-7-1)
P
in
–29 – –7.0 dB @ 1.25 Gbps, 140° F (60° C) case
temperature
Receiver optical
input wavelength
λ
in
1450 – 1620 nm –
Transmitter
extinction ratio
OMI 9 – – dB –
Dispersion
penalty at 100 km
– – – 3 dB @ 2.12 Gbps
Dispersion
penalty at 100 km
– – – 2 dB @ 1.25 Gbps
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