Data Sheet
October 2001
3970-Type 1550 nm Transmitter
Description
The 3970-type, externally modulated 1550 nm trans-
mitter provides CATV systems integrators one of the
fastest and easiest paths to customer value-added,
high-performance solutions.
The 1550 nm transmitter engine incorporates a
source laser optimized to improve transmitter and link
performance with high specifications and better sig-
nal quality. This advantage drives superior control of
RIN through fiber and management of dispersion,
stimulated brillouin scattering, and self-phase modu-
lation for better noise and distortion performance
over long-distance applications.
Features
s
Extremely fast time to market and very low engi-
neering investment
Superior CNR, CSO, and CTB performance on two
high-power optical outputs
Mobile field-tuning application provides real-time
performance optimization
High SBS suppression capabilities enhance archi-
tectural options and coverage
Multiple programmable tuning optimizations per
transmitter facilitate inventory management and
performance across architectures
The transmitter embedded system software also pro-
vides the ability to load and store multiple configura-
tions of the transmitter tuning parameters. In this way,
a single transmitter can be optimized for more than
one set of link characteristics. This feature simplifies
inventory and reduces multiple device management.
The software controls, monitors, generates/pro-
cesses alarms, and handles faults for transmitter
subsystems. The system software also accommo-
dates three interfaces for two-way communication
with the transmitter. A two-line front panel user inter-
face provides system status and telemetry, and
accepts user commands. Fine tuning can be accom-
plished in the field through an RS-232 serial inter-
face. System software upgrades can be downloaded
on-the-fly into the transmitter via this interface. A
well-defined API at the RS-485 network interface will
enable custom applications and network manage-
ment systems to communicate with and control the
transmitter.
s
s
s
s
Applications
s
s
s
High-performance supertrunking links
High-launch power distribution networks
Redundant analog ring architectures
3970-Type 1550 nm Transmitter
Data Sheet
October 2001
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
Parameter
Operating Temperature Range
Storage Case Temperature Range
Symbol
T
OP
Tstg
Min
0
–20
Max
50
65
Unit
°C
°C
Characteristics
Table 1. Optical/Electrical Characteristics
Parameter
3970A
Channel Plan
Optical Output (min)
Wavelength Range
Flatness (max)
42 MHz—750 MHz
42 MHz—870 MHz
RF Return Loss (min),
42 MHz—870 MHz
RF Input Level, CW
1
Carrier-to-Noise Ratio
(min), 65 km
2, 3
Composite Second
Order (min)
2, 3,
Composite Triple Beat
(min)
2, 3,
Cross Modulation
(min)
2, 3, 4,
Number of Outputs
5
79 NTSC
7 Each
1540—
1560
1.0
1.5
16
17—27
52
–65
–65
–65
2
3970B
40 NTSC
Low
7 Each
1540—
1560
1.0
1.5
16
20—30
55
–70
–67
–65
2
Device Code
3970C
39 NTSC
High
7 Each
1540—
1560
1.0
1.5
16
20—30
55
–70
–67
–65
2
3970D
112 NTSC
7 Each
1540—
1560
1.0
1.5
16
15.5—25.5
49
–60
–62
–60
2
3970E
60 PAL-D
7 Each
1540—
1560
1.0
1.5
16
18—28
52
–65
–65
–65
2
3970F
42 Cen-
elec
7 Each
1540—
1560
1.0
1.5
16
22—32
52
–65
–65
–65
2
—
dBm
nm
Unit
dBp-p
dBp-p
dB
dBmV/
channel
dB
dBc
dBc
dBc
—
1. Input range over which specifications are met.
2. Received power is 0 dBm. Receiver responsivity is assumed to be 1.0 mA/mW, and receiver equivalent noise current is 8 pA/(Hz)
1/2
.
3. For link consisting of transmitter, EDFA, 65 km of SMF-28 fiber, and receiver. EDFA noise figure is 5 dB minimum. Launch power from EDFA
is 16 dBm minimum. Noise bandwidth is 4 MHz for NTSC, 5 MHz for PAL and Cenelec.
4. Measured per NCTA recommended practice, except when measured with appropriate adjustments to the transmitter to prevent AGC-induced
gain change, which corrupts XMOD measurement.
5. All specifications apply to both outputs.
2
Agere Systems Inc.
3970-Type 1550 nm Transmitter
Data Sheet
October 2001
Laser Safety Information
Class IIIb Laser Product
FDA/CDRH Class IIIb laser product. All versions are Class IIIb laser products per CDRH, 21 CFR 1040 Laser
Safety requirements. All versions are Class 3B laser products per
IEC
®
60825-1:1993. The device has been
classified with the FDA under an accession number to be determined.
This product complies with 21 CFR 1040.10 and 1040.11.
Single-mode fiber pigtail and connector options (see Ordering Information, Table 4.)
Wavelength = 1500 nm
Maximum power = 30 mW
Caution: Use of controls, adjustments, and procedures other than those specified herein may result in
hazardous laser radiation exposure.
DANG ER
INVISIBLE LASER RADIATION
AVO ID DIRECT EXPOSURE TO BEAM
Wavelength: 1.5
µm
Max. Output: 30 m W,
Class IIIb Laser Product
DANGER
INVISIBLE LASER RADIATION
IS EMITTED FROM THE END
OF FIBER OR CONNECTOR
Avoid direct exposure to beam
Do not view beam directly with
optical instruments
INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR
Avoid exposure to beam
Class 3B Laser Product IEC-60825 1993
Max. Output: 30 mW
Wavelength: 1.5
µm
4
Agere Systems Inc.
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