EMCORE’s Model 1955 DFB lasers offer a low cost solution for linear fiber
optic 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 and 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 configurations.
Performance Highlights
Applications
Video Signal Distribution in HFC and
FTTx Nodes
Signal Distribution in L-Band, Wireless
Remote and DAS Links
High Linearity, Low Power Fiber Links
Frequency Range
Parameters
Operating Case Temperature Range
Min
-40
3
Typical
-
-
-
-
-
-
-
-
-
-
-
-
-
Max
85
4.9
5.9
8.9
9.9
4000
-
-55
-57
-65
-68
-
-
Units
°C
Optical Output Power
(1)
5
6
9
5
(1)
(1)
dBm
MHz
dB
dBc
Features
Linear DFB Laser Design
Output Power Up to 9 dBm Available
Bandwidth 5 – 4000 MHz
RoHS Compliance
Single and Double Optical Isolator
High Slope Efficiency up to 0.3 mW/mA
Monitor Photodiode
Carrier-to-Noise Ratio (79 channels)
51
-
-
-
-
45
Composite Second Order (79 channels)
Standard Linearity
Enhanced Linearity
Composite Triple Beat (79 channels)
(1)
Standard Linearity
Enhanced Linearity
Optical Return Loss
(1)
(1)
dBc
dB
dB
Side Mode Suppression Ratio, CW
30
1. Performance at Tcase = 25°C
| REV 2013.09
Information contained herein is deemed reliable and accurate as of the issue date. EMCORE reserves the right to change the design or specification at any time without notice.
1955 F/R/W Coaxial DFB Laser Diode
1550 nm CWDM 5 MHz – 4000 MHz
DATASHEET | SEPTEMBER 2013
FIBER OPTICS
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
Unit
o
o
C
C
mA
V
mA
V
dBmV
o
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.
Electrical/Optical Characteristics
Parameters
Optical Output Power
Symbol
Conditions/Notes
1955R opt model: 3-6 dBm
1955W opt model: 3-9 dBm
1955F opt model: 3-9 dBm
Min
3
5
6
9
-
-
Typ
-
-
-
-
8
-
1.2
-
-
4
-
-
-
Max
4.9
5.9
8.9
9.9
15
80
1.8
0.3
1.2
8
2000
50
-150
Unit
P
O
dBm
Threshold Current
Laser Bias Current
Forward Voltage
Slope Efficiency
Thermal Slope Efficiency
Laser Input Impedance
MPD Current
MPD Dark Current
Relative Intensity Noise
I
TH
I
OP
V
F
SE
TSE
Z
I
MPD
I
D
RIN
T
case
= 25ºC
mA
mA
V
mW/mA
-
I
op
T
case
= 25ºC, I
op
SE(Tc)/SE(25ºC)
T
case
= -20ºC to 85ºC
-
V
MPD
= 5V, I
op
V
MPD
= 5V, I
op
= 0
T
case
= 25ºC
CW, I
op
, T
case
= 25ºC
5 MHz - 1002 MHz
-
0.07
0.4
2
50
-
-
A
nA
dB/Hz
| REV 2013.09
Information contained herein is deemed reliable and accurate as of the issue date. EMCORE reserves the right to change the design or specification at any time without notice.
1955 F/R/W Coaxial DFB Laser Diode
1550 nm CWDM 5 MHz – 4000 MHz
DATASHEET | SEPTEMBER 2013
FIBER OPTICS
Electrical/Optical Characteristics
(continued)
Parameters
Tracking Error
Optical Isolation, T
case
= 25ºC
Spectral Width (-20 dB)
Side Mode Suppression Ratio
Optical Return Loss
Rise Time
Fall Time
Extinction Ratio
Symbol
ΔPf
ISO
Δλ
SMSR
ORL
tr
tf
ER
Conditions/Notes
I
MON
= const
ER = 10log(P
O
/2.0) [dB]
Double Isolator
Single Isolator
I
op
I
op
T
case
= 25ºC
T
case
= 25ºC
T
case
= 25ºC
10 log (2.omW/Pf (Ith))
Min
-1
45
30
-
30
35
-
-
10
Typ
-
-
-
0.1
45
-
0.05
0.10
-
Max
+1
-
-
1.0
-
-
0.10
0.15
-
Unit
dB
dB
nm
dB
dB
ns
ns
dB
1. Referenced to base of TO header.
Forward Path RF Characteristics
1955F Performance Parameter
Frequency Response Flatness
Response Up-tilt
1
2,3,4
2,3,4
1
Symbol
|S
21
|
Conditions/Notes
47 MHz – 1002 MHz
5 MHz – 4000 MHz
47 MHz < f < 1002 MHz
Min
-
-
-1
51
-
-
-
-
Typ
-
-
Max
1
4
3
Unit
dB
p-p
dB
dB
dBc
Carrier-to-Noise Ratio
CNR
Standard Linearity
Enhanced Linearity
CSO
I
op
I
op
T
case
= 25ºC
I
op
T
case
= 25ºC
-
-
-
-
-
-
-55
-57
-65
-68
Composite Second Order
Composite Triple Beat
2,3,4
Standard Linearity
Enhanced Linearity
CTB
dBc
1. I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 50Ω system.
2. 3.7% OMI, 79 NTSC unmodulated carriers (50 MHz to 550 MHz). 10 km fiber.
3. Received power = 0 dBm.
4. I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 75Ω system.
Return Path RF Characteristics
1955R Performance Parameters
Frequency Response Flatness
Second Order Distortion
Standard Linearity
Enhanced Linearity
2
1
Symbol
|S
21
|
Conditions/Notes
5 MHz - 200 MHz
P
F
= 3 dBm, OMI = 10% each
2-tone test: f1=13 MHz, f2=19 MHz
20 km of fiber
(7.5 dB total loss with connector)
DSO measures at 6 MHz, 32 MHz
P
F
= 3 dBm, OMI = 10% each
2-tone test: f1=13 MHz, f2=19 MHz
20 km of fiber
(7.5 dB total loss with connector)
DTO measures at 7 MHz, 25 MHz
Min
-
Typ
-
Max
1
Unit
dB
p-p
DSO
-
-
-
-
-45
-50
dBc
Third Order Distortion
Standard Linearity
Enhanced Linearity
2
DTB
-
-
-
-
-63
-65
dBc
1. I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 50Ω system.
2. I
op
, T
case
= 25°C. Test with laser input pin matched to a 75Ω system.
| REV 2013.09
Information contained herein is deemed reliable and accurate as of the issue date. EMCORE reserves the right to change the design or specification at any time without notice.
1955 F/R/W Coaxial DFB Laser Diode
1550 nm CWDM 5 MHz – 4000 MHz
DATASHEET | SEPTEMBER 2013
FIBER OPTICS
Wide Bandwidth Path RF Characteristics
1955W Performance Parameters
Frequency Response Flatness
Input Third Order Intercept
1dB Compression Point
3
2
1
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
dBm
dBm
1. I
op
, T
case
= 25°C. Test with the laser Input pin matched to a 50Ω system.
2. 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 = 2700 MHz, F2 = 2703 MHz, RF in = 0dBm/frequency. 0 km fiber.
3. Test at 2700 MHz. 0km fiber.
Package Outline Drawing (dimensions are in mm)
Mounting Bracket
| REV 2013.09
Information contained herein is deemed reliable and accurate as of the issue date. EMCORE reserves the right to change the design or specification at any time without notice.
1955 F/R/W Coaxial DFB Laser Diode
1550 nm CWDM 5 MHz – 4000 MHz
DATASHEET | SEPTEMBER 2013
FIBER OPTICS
Reliability/Quality
Designed to meet qualification requirements of Telcordia
TM
(Bellcore) GR-468-CORE.
Schematic and Pinout
Schematic and Pinout A
Pin Definitions for Pinout A
Pin
1
2
3
4
Description
LD Anode, Case Ground
LD Cathode
PD Cathode
PD Anode
Bottom
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 version of this
laser are Class 1 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 = 50 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.
| REV 2013.09
Information contained herein is deemed reliable and accurate as of the issue date. EMCORE reserves the right to change the design or specification at any time without notice.
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