Data Sheet
October 2001
3970-Type 1550 nm Transmitter
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
Symbol
Min
Max
Unit
Operating Temperature Range
TOP
0
50
65
°C
°C
Storage Case Temperature Range
Tstg
–20
Characteristics
Table 1. Optical/Electrical Characteristics
Parameter
Device Code
3970C 3970D
Unit
3970A
3970B
3970E
3970F
Channel Plan
79 NTSC 40 NTSC
Low
39 NTSC 112 NTSC 60 PAL-D
High
42 Cen-
elec
—
Optical Output (min)
Wavelength Range
7 Each
7 Each
7 Each
7 Each
7 Each
7 Each
dBm
nm
1540—
1560
1540—
1560
1540—
1560
1540—
1560
1540—
1560
1540—
1560
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
RF Input Level, CW1
16
17—27
52
16
20—30
55
16
20—30
55
16
15.5—25.5
49
16
18—28
52
16
22—32
52
dB
dBmV/
channel
Carrier-to-Noise Ratio
(min), 65 km2, 3
dB
Composite Second
Order (min)2, 3,
–65
–65
–65
2
–70
–67
–65
2
–70
–67
–65
2
–60
–65
–65
–65
2
–65
–65
–65
2
dBc
dBc
dBc
Composite Triple Beat
(min)2, 3,
–62
Cross Modulation
(min)2, 3, 4,
Number of Outputs5
–60
2
—
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.
AGERE [ AGERE SYSTEMS ]
