DATA SHEET| OCTOBER 25, 2004
1751A 1550 nm DWDM DFB Laser Module
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.
Applications
§
Node capability
§
Narrow transmitter housing
§
Networks with limited fiber
§
Architectures using separate
optical wavelengths to carry
targeted services
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.
Performance Highlights
Min
Typical
-
-
-
-
-
-
-
-
Max
1562.23
-
+85
210
860
-
-
100
Units
nm
mW
°C
MHz
MHz
dBc
dBc
MHz/mA
Features
§
Standard ITU grid wavelengths
§
Advanced analog chip design
§
Reduces equipment
requirements in the hub
§
Telcordia Technologies
compliant
TM
Available wavelengths
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)
1527.99
6-10
-40
5
40
50
60
40
468
§
Wide temperature range—
stable even in harsh
environments
See following pages for complete specifications and conditions.
For more information on this and other products:
Contact Sales at Ortel 626-293-3400, or visit www.emcore.com.
1751A 1550 nm DWDM DFB Laser Module
DATA SHEET| OCTOBER 25, 2004
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 (T
L
) = 25°C, I
F
=I
OP
, Beginning of Life (BOL)
Parameter
Symbol
Condition
Wavelength
?
OP
I
F
= I
OP
, T = T
OP
Optical Output Power
P
O
1751xxxx-06 version
-08 version
-10 version
Optical Isolation
ISO
Sidemode Suppression Ratio
SMSR
Laser Relative Intensity Noise
RIN
I
F
= I
TH
+ 70 mA,
T = 25
°C
Wavelength Drift as Case Temp. is
I
F
= 60 mA, T = T
OP
,
λ∆
Changed
Tc varied from minàmax
Threshold Current
I
TH
Operating Current
I
OP
Monitor PD Responsivity
r
PD
V
RM
=5V
Thermistor Resistance
Thermistor Temperature
Coefficient
TEC Current
Fiber Length
Fiber Buffer
Fiber Core / Cladding
R
TH
TC
TH
I
TEC
-
-
-
T
OP
=25
°C
T
OP
=25
°C
-40<T
C
<+85°C
I
F
= 100 mA
May include splice
-
-
Min
1527.94
6
8
10
30
35
-
-
-
-
10
9.5
-
-1.5
1.0
-
-
Typ
-
-
-
-
-
-
<-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
dB
dB
dB/Hz
nm
mA
mA
µA/m
W
K?
%/°C
A
m
µm
µm
ORTEL, A division of EMCORE
1751A 1550 nm DWDM DFB Laser Module
DATA SHEET| OCTOBER 25, 2004
RF Characteristics
Parameter
1
Frequency Range
Return Path
Forward Path
1
Frequency Response
Return Path Version 5-210 MHz
Forward Path Version 40- 860 MHz
1
RF Return Loss
Composite Second Order
Composite Triple Beat
Adiabatic Chirp
Nominal Input Impedance
Symbol
F
Condition
I
F
= 60 mA
Min
5
40
-
-
-
| S11 |
CSO
CTB
FM
Z
IN
I
F
= 60 mA,
T
OP
= 25
°C
-
I
F
= I
OP
I
F
= I
OP
I
F
= 60 mA, T = 25
°C,
measured at 500 MHz
-
-
-
16
50
60
40
-
Typ
-
-
±0.5
±0.5
-
-
-
-
25
Max
210
860
-
-
-
-
-
100
-
Units
MHz
MHz
dB
dB
dB
dBc
dBc
MHz/
mA
dB
1. Tested in a 50 Ohm resistively matched system.
2. Eight channel loading with 10% OMI and 40 km fiber.
3. Measured at 42 MHz.
4. Measured at 553.25 MHz, 577.25 MHz, and 595.25 MHz.
All parameters at Beginning of Life (BOL) and I
F
= I
OP
, unless noted otherwise.
In order to prevent reflection-induced distortion, the laser must be connected to an optical cable having a return loss of at least 55 dB for discrete
reflections and 30 dB for distributed reflections.
Electrical Schematics
Figure 1. 1754W Laser Schematic
Figure 1. 1751A Laser Schematic
Figure 2. 1751A Circuit Schematic
ORTEL, A division of EMCORE
3
1751A 1550 nm DWDM DFB Laser Module
DATA SHEET| OCTOBER 25, 2004
Outline Diagram
Dimensions are in inches and (millimeters)
Pin Information
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Description
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
ORTEL, A division of EMCORE
4
1751A 1550 nm DWDM DFB Laser Module
DATA SHEET| OCTOBER 25, 2004
Laser Safety
This product meets the appropriate standard in Title 21 of the Code of Federal Regulations (CFR). FDA/CDRH
Class IIIb laser product. This device has been classified with the FDA/CDRH under accession number 0220309.
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 IIIb 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.
ORTEL, A division of EMCORE
5
