DATASHEET| JULY 7, 2008
Model 1935W Coaxial DFB Laser Diode
O-Band CWDM, Wide Bandwidth 900MHz – 4000MHz
Emcore’s Model 1935W DFB lasers offer a low cost solution for linear
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 Emcore’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
Applications
Signal distribution in L-band
and wireless remoting links
High linearity, low power fiber
links
flexible integration into various transmitter configurations.
Performance Highlights
Min
Operating Case Temperature Range
-20
3
Minimum Optical Output Power
6
9
10
Frequency Range
Input Third Order Intercept Point
1dB Compression Point
O-Band CWDM Wavelength
Optical Return Loss
Side Mode Suppression Ratio, CW
900
30
16
Typical
-
-
-
-
-
-
-
-
Max
45
5.8
8.8
9.8
11.8
4000
-
-
MHz
dB
dB
nm
dB
dB
dBm
Units
°C
Features
Linear DFB laser design
Output power up to 10 dBm
available
4GHz Bandwidth
RoHS compliant
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 1935W O-Band CWDM Coaxial DFB
Wide Bandwidth Laser Diode
Absolute Maximum Ratings
1
DATASHEET| JULY 7, 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 1935W O-Band CWDM Coaxial DFB
Wide Bandwidth Laser Diode
Electrical/Optical Characteristics
Parameters
Minimum Optical Output Power
Threshold Current
Laser Bias Current
Forward Voltage
Laser Input Impedance
MPD Current
MPD Dark Current
Symbol
P
O
I
TH
T
OP
V
F
Z
I
MPD
I
D
Conditions/Notes
3 dBm version
6 dBm version
9 dBm version
10 dBm version
T
case
= 25ºC
T
case
= 45ºC
T
case
= 25ºC
I
op
-
V
MPD
= 5V, I
op
= 40 mA
V
MPD
= 5V, I
op
= 0
T
case
= 25ºC
Min
3
6
9
10
-
-
-
-
2
200
-
1267
1287
DATASHEET| JULY 7, 2008
Typ
-
-
-
-
8
13
-
1.65
5.5
-
-
1271
1291
1311
1331
1351
1371
Max
5.8
8.8
9.8
11.8
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
1307
1327
1347
1367
nm
Relative Intensity Noise
Optical Isolation
Spectral Width (-20 dB)
Side Mode Suppression Ratio
Tracking Error
Optical Return Loss
1.
Referenced to base of TO header.
RIN
ISO
∆λ
SMSR
ER
ORL
CW, I
op
,
50 MHz < f < 550 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
-
-
0.1
45
-
-
-150
-
1.0
-
+1
-
dB/Hz
dB
nm
dB
dB
dB
RF Characteristics
Parameters
Bandwidth
3 dB
1
Frequency Response Flatness
1,2
Input Third Order Intercept
1,3
1dB Compression Point
1.
2.
3.
Symbol
BW
|S
21
|
IIP3
P
1dB
Conditions/Notes
I
op
, T
case
= 25ºC
900 MHz – 4000 MHz
Standard Linearity, I
bb
I
bb,
T
case
= 25ºC
Min
4000
-
30
16
Typ
-
-
-
-
Max
-
4
-
-
Unit
MHz
dB
p-p
dB
dBm
I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 50Ω system.
IIP3 is measured at I
bb
where I
bb
is the bias point at which simultaneously the laser at its best linearity and the optical power is within
specification. Test Frequency F1 = 2700MHz, F2 = 2703MHz, RF in = 0dBm/frequency. 0km fiber.
Test at 2700MHz. 0km fiber.
EMCORE CORPORATION
3
Model 1935W O-Band CWDM Coaxial DFB
Wide Bandwidth Laser Diode
Package Outline Drawing
DATASHEET| JULY 7, 2008
Mounting Bracket
EMCORE CORPORATION
4
Model 1935W O-Band CWDM Coaxial DFB
Wide Bandwidth Laser Diode
Reliability/Quality
DATASHEET| JULY 7, 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
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