DATASHEET | FEBRUARY 2012
FIBER OPTICS
Applications
The 1751 laser module is a Dense Wavelength-Division Multiplexing (DWDM)
laser for analog applications. It features a distributed feedback chip that has been
designed specifically for Radio Frequency (RF) applications. The 1751 laser
module has a wide temperature range for reliable performance in harsh node
environments and narrow transmitter designs. It also features low adiabatic chirp
to maximize signal quality in short and long lengths of fiber. The laser’s excellent
inherent linearity minimizes degradation of the broadcast signals caused by
quadrature amplitude modulated (QAM) channels. The versatile 1751 laser
module reduces cable network architecture fiber needs and lessens equipment
reqirements in the hub.
The 1751 is available in a wide range of standard ITU wavelengths. The lasers
are offered as either forward-path (40 MHz- 860 MHz) or return-path (5 MHz-210
MHz) modules.
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Features
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Performance Highlights
Parameters
Available wavelengths (ITU Grid)
Optical Output Power (multiple versions)
Temperature Case Temperature Range
Frequency Range:
Return Path
Forward Path
Composite Second Order
Composite Triple Beat
Adiabatic Chirp (measured at 500 MHz)
Min
1527.99
6-10
-40
5
40
50
60
40
Typical
-
-
-
-
-
-
-
-
Max
1562.23
-
+85
210
860
-
-
100
Units
nm
mW
°C
MHz
MHz
dBc
dBc
MHz/mA
| REV 2012.02
DATASHEET | FEBRUARY 2012
FIBER OPTICS
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute 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 Case Temperature
Storage Temperature
Laser Forward dc Current
Reverse Voltage Photodiode
Laser Reverse Voltage, dc
ESD
TEC Current
RF Input Power
Symbol
T
C
T
STG
-
V
RPD
V
R
-
I
TEC
P
RFIN
Condition
continuous
-
-
-
-
HBM: R = 1500 Ohm, C = 100 pF
continuous
I
F
= I
OP
Min
-40
-40
-
-
-
-500
-1.7
-
Max
+85
+85
150
10
1
500
1.7
62
Units
°C
°C
mA
V
V
V
A
dBmV
Electrical/Optical Characteristics
Laser Temperature (TL) = 25
o
C, I
F
=I
OP
, Beginning of Life (BOL)
Parameter
Symbol
OP
Condition
Min
1527.94
6
8
10
0.16
30
35
Typ
-
-
-
-
0.19
-
-
<-155
-
-
-
-
10
-4.4
-
1.5
900
9/125
Max
1563.1
-
-
-
-
-
-
-
0.04
20
120
200
10.5
-
1.6
-
-
-
Unit
nm
mW
mW
mW
mW/mA
dB
dB
dB/Hz
nm
mA
mA
A/mW
K
%/°C
A
m
µm
µm
Wavelength
1
I
F
= I
OP
, T = T
OP
1751xxxx-06 version
-08 version
-10 version
Points measure @
I
F
= I
TH
+ 20 mA & I
F
= I
TH
+ 60 mA
Optical Output Power
P
O
Slope Efficiency
Optical Isolation
Sidemode Suppression Ratio
Laser Relative Intensity Noise
Wavelength Drift as Case Temp. is
Changed
Threshold Current
Operating Current
Monitor PD Responsivity
Thermistor Resistance
Thermistor Temperature
Coefficient
TEC Current
Fiber Length
Fiber Buffer
Fiber Core / Cladding
SE
ISO
SMSR
I
F
= I
TH
+ 70 mA,
RIN
λ∆
I
TH
I
OP
r
PD
R
TH
TC
TH
I
TEC
-
-
-
V
RM
=5V
T
OP
=25
°C
T
OP
=25
°C
-40<T
C
<+85°C
I
F
= 100 mA
May include splice
-
-
T = 25
°C
I
F
= 60 mA, T = T
OP
,
Tc varied from min max
-
-
-
-
10
9.5
-
-1.5
1.0
-
-
1. Measured Wavelength = Operating wavelength with a tolerance of ± 0.05 nm.
| REV 2012.02
DATASHEET | FEBRUARY 2012
FIBER OPTICS
RF Characteristic
Parameter
Frequency Range
Return Path
Forward Path
Frequency Response
1
Return Path Version 5-210 MHz
Forward Path Version 40- 860 MHz
RF Return Loss
1
Composite Second Order
Composite Triple Beat
Carrier to Noise Ratio
Adiabatic Chirp
Nominal Input Impedance
1
Symbol
F
-
-
| S11 |
CSO
CTB
CNR
FM
Z
IN
Condition
I
F
= 60 mA
I
F
= 60 mA,
T
OP
= 25
°C
-
I
F
= I
OP
Note 2, 3, 4 and 5
I
F
= I
OP
Note 2, 3, 4 and 5
I
F
= I
OP
Note 2, 3, 4 and 5
I
F
= 60 mA, T = 25
°C,
measured at 500 MHz
-
Min
5
40
-
-
16
50
60
51
40
-
Typ
-
-
±0.5
±0.5
-
-
-
-
-
25
Max
210
860
-
-
-
-
-
-
100
-
Units
MHz
MHz
dB
dB
dB
dBc
dBc
dB
MHz/m
A
dB
1. Measured on a 50Ω resistively matched system.
2. I
OP
is the bias point at which simultaneously the linearity, the min. optical power and the required operating wavelength,
λ
OP
are obtained.
3. 8 channel loading with 10% OMI and 40 km fiber length.
4. Receiver thermal noise 8 pA*Hz
-0.5
, 0.5mA at Ith+40mA, photodiode responsivity ~1.1A/W, noise bandwidth 4.2 MHz
5. Forward band (FB=45-870 MHz): Eight channel CW measurement: channel frequencies set at 553.25, 559.25, 565.25,
571.25, 577.25, 583.25, 589.25, and 595.25 MHz. CTB measured at 553.25, 577.25, and 595.25 MHz. CSO measured at
42 MHz
6. Measured Wavelength = Operating wavelength with a tolerance of + 0.05 nm.
Electrical Schematics
Figure 1. 1751A Laser Schematic
Figure 2. 1751A Circuit Schematic
| REV 2012.02
DATASHEET | FEBRUARY 2012
FIBER OPTICS
Outline Diagrams (Dimensions are in inches and millimeters)
Pin Definitions
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Thermistor
Thermistor
Dc Laser Bias (-)
MPD Anode (-)
MPD Cathode (+)
Thermal Electric Cooler (+)
Thermal Electric Cooler (-)
Case Ground
Case Ground
NC
Laser Common (+)
Laser Modulation (-)
Laser Common (+)
NC
Description
| REV 2012.02
DATASHEET | FEBRUARY 2012
FIBER OPTICS
Laser Safety
This product meets the appropriate standard in Title 21 of the Code of Federal Regulations (CFR). FDA/CDRH Class 1 laser
product. This device has been classified with the FDA/CDRH under accession number 0220191.
All Versions of this laser are Class 3B laser product, tested according to IEC 60825-1:2007/EN 60825-1:2007
Single-mode fiber pigtail with SC/APC connectors (standard).
Wavelength = 1.5
µm.
Maximum power = 30 mW.
Because of size constraints, laser safety labeling (including an FDA class 1 label) is not affixed to the module, but attached
to the outside of the shipping carton.
Product is not shipped with power supply.
Caution: Use of controls, adjustments and procedures other than those specified herein may result in hazardous
laser radiation exposure.
DANGER
INVISIBLE LASER
AVOID DIRECT EXPOSURE TO BEAM
RADIATION
Wavelength: 1.3
µ
m
Max. Output: 50 mW,
Class 1 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 1 Laser Product IEC-60825-1:20007 Max. Output:50 mw
Wavelength: 1.3
µ
m
| REV 2012.02
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