3970-Type 1550 nm Transmitter
Data Sheet
October 2001
Features
s
Extremely fast time to market and very low engi-
neering investment
s
Superior CNR, CSO, and CTB performance on two
high-power optical outputs
s
Mobile field-tuning application provides real-time
performance optimization
s
High SBS suppression capabilities enhance archi-
tectural options and coverage
s
Multiple programmable tuning optimizations per
transmitter facilitate inventory management and
performance across architectures
Applications
s
High-performance supertrunking links
s
High-launch power distribution networks
s
Redundant analog ring architectures
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.
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.
2
Agere Systems Inc.
Data Sheet
3970-Type 1550 nm Transmitter
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.
Characteristics
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.
Parameter
Symbol
Min
Max
Unit
Operating Temperature Range
T
OP
0
50
C
Storage Case Temperature Range
Tstg
20
65
C
Table 1. Optical/Electrical Characteristics
Parameter
Device Code
Unit
3970A
3970B
3970C
3970D
3970E
3970F
Channel Plan
79 NTSC
40 NTSC
Low
39 NTSC
High
112 NTSC
60 PAL-D
42 Cen-
elec
--
Optical Output (min)
7 Each
7 Each
7 Each
7 Each
7 Each
7 Each
dBm
Wavelength Range
1540--
1560
1540--
1560
1540--
1560
1540--
1560
1540--
1560
1540--
1560
nm
Flatness (max)
42 MHz--750 MHz
42 MHz--870 MHz
1.0
1.5
1.0
1.5
1.0
1.5
1.0
1.5
1.0
1.5
1.0
1.5
dBp-p
dBp-p
RF Return Loss (min),
42 MHz--870 MHz
16
16
16
16
16
16
dB
RF Input Level, CW
1
17--27
20--30
20--30
15.5--25.5
18--28
22--32
dBmV/
channel
Carrier-to-Noise Ratio
(min), 65 km
2, 3
52
55
55
49
52
52
dB
Composite Second
Order (min)
2, 3,
65
70
70
60
65
65
dBc
Composite Triple Beat
(min)
2, 3,
65
67
67
62
65
65
dBc
Cross Modulation
(min)
2,
3, 4,
65
65
65
60
65
65
dBc
Number of Outputs
5
2
2
2
2
2
2
--
3
Agere Systems Inc.
Data Sheet
October 2001
3970-Type 1550 nm Transmitter
Electrical/Optical Characteristics
(continued)
Outline Diagram
Table 2. Power Requirements
Parameter
Min
Max
Unit
ac Input Range
94
50
245
60
Vac
Hz
dc Input Range, Floating
36
60
Vdc
Power
--
50
W
Table 3. Package Characteristics
Parameter
Dimension
unit
Height
1.72 (44), 1U
in. (mm)
Width
19 (483)
in. (mm)
Depth
13.16 (334) with fans
in. (mm)
Weight
9.0 (4)
lbs. (kg)
1550 TRANSMITTER
LASER
OFF
ON
STATUS
SELECT
RF TEST
SELECT
CHOOSE ITEMS FROM
MENU STRUCTURE TO
VIEW/CHANGE.
DISPLAY
HEIRARCHICAL MENU
VIA FRONT PANEL
STRUCTURE ACCESSIBLE
PUSHBUTTONS. ENABLES
MONITORING AND CONTROL
OF SELECTED PARAMETERS.
KEYSWITCH
CONFORMS TO IEC
SAFETY STANDARDS;
PROTECTS USERS
FROM INADVERTENT
EXPOSURE.
LASER LED
INDICATES STATUS
OF SOURCE LASER.
STATUS LED
ENABLES MONITORING
OF ALL ALARMS AND
WARNINGS;
GREEN, AMBER, RED
UP/DOWN PUSHBUTTONS
ENABLES NAVIGATION
THROUGH MENU AND
PARAMETER INCREMENT/
DECREMENT.
RF TEST PORT
REPLICA OF
INPUT RF SIGNAL.
Opt
A
Opt
B
FACTORY
RS-485
AUX2 AUX1 MIN
MAJ
ALARM
RFIN
LCD
NC CNO NC CNO NC CNO NC CNO
36 Vdc-60 Vdc
+GND
94 Vac-245 Vac IN
0
1
T
250 V
2 A
MODEL/SN
IDENTIFYING LABEL
1-1178F
1-1178F.a
4
Agere Systems Inc.
Data Sheet
3970-Type 1550 nm Transmitter
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.
DAN G ER
IN VISIBLE LA SER RAD IATION
M ax. 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
AVO ID DIREC T EXPOSURE TO BEAM
Wavelength: 1.5
m
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
m
5
Agere Systems Inc.
Data Sheet
October 2001
3970-Type 1550 nm Transmitter
Ordering Information
* For additional ordering information, please contact an account manager at OPTO West, Agere Systems Inc., 1-800-362-3891 (for sales staff,
please press option 2).
Table 4. Ordering Information
Device Code
Description
Connector Options
Comcode
3970-Type
1550 nm Transmitter
FC/APC bulkhead, tight key;
SC/APC bulkhead;
E-2000/APC bulkhead
TBD
Data Sheet
3970-Type 1550 nm Transmitter
October 2001
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
Copyright 2001 Agere Systems Inc.
All Rights Reserved
October 2001
DS00-280OPTO-1 (Replaces DS00-280OPTO)
For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:
http://www.agere.com
E-MAIL:
docmaster@agere.com
N. AMERICA:
Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)
ASIA:
Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon
Tel. (852) 3129-2000, FAX (852) 3129-2020
CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen)
JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei)
EUROPE:
Tel. (44) 7000 624624, FAX (44) 1344 488 045
IEC is a registered trademark of The International Electrotechnical Commission.
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