DATASHEET| JUNE 15, 2008
Model 1935R, Coaxial DFB Laser Diode
O-Band CWDM, CATV Return Path 5 MHz – 200 MHz
Emcore’s Model 1935R DFB lasers offer a low cost solution for linear
return path fiberoptic links. These components can be cooled with
external thermo-electric coolers for high stability, or run without TEC’s to
reduce power consumption. The DFB laser builds upon Ortel’s long
history of high performance, leading edge designs in CATV, wireless,
and high speed digital applications. The laser diode devices are
packaged in a compact hermetic assembly together with monitor
photodiode and isolator, for flexible integration into various transmitter
Applications
Return path transport in HFC
and FTTx networks
High linearity, low power fiber
links
configurations.
Performance Highlights
Min
Operating Case Temperature Range
-40
3
Optical Output Power
5
6
Frequency Range
Second Order Distortion
Standard Linearity
Enhanced Linearity
Third Order Distortion
Standard Linearity
Enhanced Linearity
Center Wavelength:
Optical Return Loss
Side Mode Suppression Ratio, CW
-
-
-
-
-63
-65
nm
dB
dB
dBc
-
-
-
-
-52
-58
dBc
5
Typical
-
-
-
-
-
Max
80
4.8
5.8
8.0
200
MHz
dBm
Units
°C
Features
Linear DFB laser design
RoHS compliance
Optical Isolator
Low power consumption
Monitor photodiode
1271, 1291, 1311, 1331, 1351, 1371
35
30
-
-
-
-
See following pages for complete specifications and conditions.
For more information on this and other products:
Contact Sales at Emcore 626-293-3400, or visit www.emcore.com.
Model 1935R O-Band CWDM Coaxial DFB
Return Path Laser Diode
Absolute Maximum Ratings
1
DATASHEET| JUNE 15, 2008
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.
Parameters
Storage Temperature
Operating Case Temperature
Laser Diode Forward Current
Laser Diode Reverse Voltage
Photodiode Forward Current
Photodiode Reverse Voltage
Average RF Input Power
Lead Soldering Temperature/Time
Relative Humidity
ESD
1.
Symbol
T
STG
T
OP
I
OP
V
R
I
MPD
V
MPD,R
PIN
-
RH
-
Condition/Notes
Non-Operating
Continuous
CW
Continuous
Continuous
Continuous
60 Seconds
-
Continuous
Human Body Model
MIN
-40
-40
-
-
-
-
-
-
-
-500
MAX
85
80
100
1.0
2
10
62
260/10
85
+500
Unit
o
C
o
C
mA
V
mA
V
dBmV
o
C/sec
%
V
Absolute maximum data are limited to system design only; proper device performance is not guaranteed over rating listed above. Operation
beyond these maximum conditions may degrade device performance, lead to device failure, shorter lifetime, and will invalidate the device
warranty.
EMCORE CORPORATION
Model 1935R O-Band CWDM Coaxial DFB
Return Path Laser Diode
Electrical/Optical Characteristics
Parameters
Optical Output Power
Threshold Current
Laser Bias Current
Forward Voltage
Laser Input Impedance
MPD Current
MPD Dark Current
Symbol
P
O
I
TH
I
OP
V
F
Z
I
MPD
I
D
Conditions/Notes
3 dBm version
5 dBm version
6 dBm version
T
case
= 25ºC
T
case
= 45ºC
-
I
op
-
V
MPD
= 5V, I
op
= 40 mA
V
MPD
= 5V, I
op
= 0
T
case
= 25ºC
Min
3
5
6
-
-
-
-
2
200
-
1267
1287
1307
1327
1347
1367
DATASHEET| JUNE 15, 2008
Typ
-
-
-
8
13
-
1.0
4
-
-
1271
1291
1311
1331
1351
1371
Max
4.8
5.8
8.0
15
20
80
1.8
8
2000
50
1275
1295
1315
1335
1355
1375
Unit
dBm
mA
mA
V
Ω
µA
nA
O-Band CWDM Center Wavelength
λ
c
I
op
T
case
= 25ºC
nm
Relative Intensity Noise
Optical Isolation
Spectral Width (-20 dB)
Side Mode Suppression Ratio
Tracking Error
Optical Return Loss
RIN
ISO
∆λ
SMSR
ER
ORL
CW, I
op
,
5 MHz < f < 200 MHz
T
case
= 25ºC
I
op,
T
case
= 25ºC
I
op.
T
case
= 25ºC
I
MON
= const
ER = 10log(P
O
/2.0) [dB]
T
case
= 25ºC
-
30
-
30
-1
35
-155
-
0.1
45
-
-
-145
-
1.0
-
+1
-
dB/Hz
dB
nm
dB
dB
dB
RF Characteristics
Parameters
1
Frequency Response Flatness
1
Response Up-tilt
Second Order Distortion
Standard Linearity
Enhanced Linearity
2
Symbol
|S
21
|
DSO
Third Order Distortion
Standard Linearity
Enhanced Linearity
2
DTB
Conditions/Notes
5 MHz < f < 200 MHz
5 MHz < f < 200 MHz
P
F
= 3 dBm, OMI = 10% each
2-tone test: f1=7MHz, f2=56MHz
0 km of fiber
(7.5 dB total passive loss with
connector), f1 + f2
P
F
= 3 dBm, OMI = 10% each
2-tone test: f1=7MHz, f2=56MHz
0 km of fiber
(7.5 dB total passive loss with
connector),
2f2-f1
Min
-
0
-
-
Typ
-
Max
1
2
-52
-58
Unit
dB
p-p
dB
dBc
-
-
-
-
-
-
-63
-65
dBc
1.
2.
I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 50Ω system.
I
op
, T
case
= 25°C. Test with laser input pin matched to a 75Ω system.
EMCORE CORPORATION
3
Model 1935R O-Band CWDM Coaxial DFB
Return Path Laser Diode
Package Outline Drawing
DATASHEET| JUNE 15, 2008
Mounting Bracket
EMCORE CORPORATION
4
Model 1935R O-Band CWDM Coaxial DFB
Return Path Laser Diode
Reliability/Quality
DATASHEET| JUNE 15, 2008
Designed to meet qualification requirements of Telcordia
TM
(Bellcore) GR-468-CORE.
Schematic and Pinout
3
PD
4
2
LD
1
Pinout A
Pin Definitions
Pin
1
2
3
4
Description
LD Anode, Case Ground
LD Cathode
PD Cathode
PD Anode
EMCORE CORPORATION
5
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