DATASHEET| MARCH 3, 2010
Model 1955F/R/W Coaxial DFB Laser Diode
1550nm CWDM, 5 MHz – 4000 MHz
Emcore’s Model 1955 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 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
Applications
Video signal distribution in
HFC and FTTx nodes
Signal distribution in L-band
and wireless remoting links
High linearity, low power fiber
links
Operating Case Temperature Range
flexible integration into various transmitter configurations.
Performance Highlights
Min
-40
3
5
Optical Output Power
6
9
10
Frequency Range
Carrier-to-Noise Ratio (79 channels)
Composite Second Order (79 channels)
Standard Linearity
Enhanced Linearity
Composite Triple Beat (79 channels)
CWDM Wavelength
Optical Return Loss
Side Mode Suppression Ratio, CW
-
-
-
-
-
-
-55
-57
-65
dBc
nm
dB
dB
dBc
5
51
Typical
-
-
-
-
-
-
-
Max
85
4.9
5.9
8.9
9.0
11.9
4000
-
MHz
dB
dBm
Units
°C
Features
Linear DFB laser design
Output power up to 10 dBm
available
Bandwidth 5 - 4000 MHz
RoHS compliance
Single and Double Optical
Isolator
High slope efficiency up to
0.3mW/mA
Monitor photodiode
1470, 1490, 1510, 1530, 1550, 1570, 1590, 1610
45
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 1955F/R/W 1550nm CWDM Coaxial
DFB Laser Diode
DATASHEET| MARCH 3, 2010
Absolute Maximum Ratings
1
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
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
85
150
1.0
2
10
62
260/10
85
+500
o
Unit
o
o
C
C
mA
V
mA
V
dBmV
C/sec
%
V
1. 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 1955F/R/W 1550nm CWDM Coaxial
DFB Laser Diode
Electrical/Optical Characteristics
Parameters
Optical Output Power
Symbol
P
O
Conditions/Notes
3 dBm version
5 dBm version
6 dBm version
9 dBm version
10 dBm version
T
case
= 25ºC
T
case
= 45ºC
T
case
= 25ºC, I
op
SE(Tc)/SE(25ºC)
T
case
= -20ºC to 85ºC
DATASHEET| MARCH 3, 2010
Threshold Current
Slope Efficiency
Thermal Slope Efficiency
I
TH
SE
TSE
Min
3
5
6
9
10
-
-
0.07
0.4
Typ
-
-
-
-
8
13
-
-
Max
4.9
5.9
8.9
9.9
11.9
15
20
0.3
1.2
Unit
dBm
mA
mW/mA
-
Laser Bias Current
Forward Voltage
Laser Input Impedance
MPD Current
MPD Dark Current
I
OP
V
F
Z
I
MPD
I
D
I
op
-
V
MPD
= 5V, I
op
V
MPD
= 5V, I
op
= 0, T
case
= 25ºC
-
-
2
50
-
1468
1488
-
1.17
4
-
-
1470
1490
1510
1530
1550
1570
1590
1610
80
1.8
8
2000
50
1472
1492
1512
1532
1552
1572
1592
1612
mA
V
Ω
µA
nA
I
op
CWDM Center Wavelength
λ
c
T
case
= 25ºC
1508
1528
1548
1568
1588
1598
nm
Relative Intensity Noise
Optical Isolation
Spectral Width (-20 dB)
Side Mode Suppression Ratio
Tracking Error
Rise Time
Fall Time
Extinction Ratio
Optical Return Loss
1. Referenced to base of TO header.
RIN
ISO
∆λ
SMSR
Pf
tr
tf
ER
ORL
CW, I
op
,
47 MHz - 1002 MHz
Double Isolators, T
case
= 25ºC
I
op,
T
case
= 25ºC
I
op,
T
case
= 25ºC
I
MON
= const
ER = 10log(P
O
/2.0) [dB]
20-80%
T
case
= 25ºC
80-20%
T
case
= 25ºC
10log (2.0mW/Pf (Ith))
T
case
= 25ºC
T
case
= 25ºC
-
45
-
30
-1
-
-
10
35
-
-
0.1
45
-
0.05
0.10
-
-
-150
-
1.0
-
+1
0.10
0.15
-
-
dB/Hz
dB
nm
dB
dB
ns
ns
dB
dB
Fiber Characteristics
Fiber Type:
Fiber Length:
900 micron buffer
1.0 – 1.4 meter
EMCORE CORPORATION
3
Model 1955F/R/W 1550nm CWDM Coaxial
DFB Laser Diode
Forward Path RF Characteristics
1955F Performance Parameters
Frequency Response Flatness
1
1
DATASHEET| MARCH 3, 2010
Symbol
|S
21
|
CNR
CSO
CTB
Response Up-tilt
2,3,4
Carrier-to-Noise Ratio
2,3,4
Composite Second Order
Standard Linearity
Enhanced Linearity
Composite Triple Beat
1.
2.
3.
4.
2,3,4
Conditions/Notes
47 MHz to 1002 MHz
5 MHz to 4000 MHz
47 MHz to 1002 MHz
I
op,
T
case
= 25ºC
I
op
T
case
= 25ºC
I
op
T
case
= 25ºC
Min
-
-
-1
51
-
-
-
Typ
-
-
-
-
-
-
Max
1
4
3
-
-55
-57
-65
Unit
dBp-p
dBp-p
dB
dB
dBc
dBc
I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 50Ω system.
3.7% OMI, 79 NTSC unmodulated carriers (50 MHz to 550 MHz). 0 km fiber.
Received power = 0 dBm.
I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 75Ω system.
Return Path RF Characteristics
1955R Performance Parameters
1
Frequency Response Flatness
Discrete Second Order
Standard Linearity
Enhanced Linearity
Discrete Third Order
Standard Linearity
Enhanced Linearity
1.
2.
2
2
Symbol
|S
21
|
DSO
DTO
Conditions/Notes
5 MHz - 200 MHz
P
F
= 3 dBm, OMI = 10% each
2-tone: f1=13MHz, f2=19MHz
20 km of fiber
(7.5 dB total loss with connector)
DSO meas at 6MHz, 32MHz
P
F
= 3 dBm, OMI = 10% each
2-tone: f1=13MHz, f2=19MHz
20 km of fiber
(7.5 dB total loss with connector)
DTO meas at 7MHz, 25MHz
Min
-
-
-
Typ
-
-
-
Max
1
-45
-50
Unit
dB
p-p
dBc
-
-
-
-
-63
-65
dBc
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.
Wide Bandwidth Path RF Characteristics
1955W Performance Parameters
1
Frequency Response Flatness
2
Input Third Order Intercept
3
1dB Compression Point
1.
2.
3.
Symbol
|S
21
|
IIP3
P
1dB
Conditions/Notes
900 MHz – 4000 MHz
Standard Linearity, I
bb
I
bb
Min
-
30
16
Typ
-
-
-
Max
4
-
-
Unit
dB
p-p
dB
dB
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
4
Model 1955F/R/W 1550nm CWDM Coaxial
DFB Laser Diode
Package Outline Drawing
Note: Dimensions are in mm
DATASHEET| MARCH 3, 2010
Mounting Bracket
EMCORE CORPORATION
5
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