EMCORE’s Model 1935 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 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
Parameters
Min
-40
3
5
Optical Output Power
(1)
Typical
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Max
85
4.9
5.9
8.9
9.9
11.9
4000
-
-57
-60
-65
-68
-
-
Units
C
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
6
9
10
dBm
Frequency Range
Carrier-to-Noise Ratio (79 channels)
(1)
(1)
5
51
-
-
-
-
45
(1)
MHz
dB
dBc
Features
Linear DFB Laser Design
Ouput Power Up to 10 dBm Available
Bandwidth 47 – 1002 MHz
RoHS Compliance
Optical Isolator
Low Power Consumption
Monitor Photodiode
Composite Second Order (79 channels)
Standard Linearity
Enhanced Linearity
Composite Triple Beat (79 channels)
(1)
Standard Linearity
Enhanced Linearity
Optical Return Loss
(1)
dBc
dB
dB
Side Mode Suppression Ratio, CW
30
1. Performance at Tcase = 25°C
| REV 2012.08
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.
1935 F/R/W Coaxial DFB Laser Diode
O-Band CWDM 5 MHz – 4000 MHz
DATASHEET | AUGUST 2012
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
3 dBm Version
5 dBm Version
6 dBm Version
9 dBm Version
10 dBm Version
T
case
= 25ºC
T
case
= 45ºC
Min
3
5
6
9
10
-
-
-
Typ
-
-
-
-
-
8
13
-
1.17
-
-
4
-
-
-
Max
4.9
5.9
8.9
9.9
11.9
15
20
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
mA
mA
V
mW/mA
-
A
nA
dB/Hz
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
-
-
| REV 2012.08
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.
1935 F/R/W Coaxial DFB Laser Diode
O-Band CWDM 5 MHz – 4000 MHz
DATASHEET | AUGUST 2012
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
Symbol
ΔPf
ISO
SMSR
ORL
Conditions/Notes
I
MON
= const
ER = 10log(P
O
/2.0) [dB]
Double Isolator
I
op
I
op
T
case
= 25ºC
Min
-1
45
-
30
35
Typ
-
-
0.1
45
-
Max
+1
-
1.0
-
-
Unit
dB
dB
nm
dB
dB
1. Referenced to base of TO header.
Forward Path RF Characteristics
1935F 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
-
-
-
-
-
-
-57
-60
-65
-68
Composite Second Order
Composite Triple Beat
2,3,4
Standard Linearity
Enhanced Linearity
CTB
dBc
1. I
op
, T
case
= 25C. Test with the laser Input pin matched to a 50 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
= 25C. Test with the laser Input pin matched to a 75 system.
Return Path RF Characteristics
1935R Performance Parameters
Frequency Response Flatness
Second Order Distortion
Standard Linearity
Enhanced Linearity
2
2
1
Symbol
|S
21
|
Conditions/Notes
5 MHz - 200 MHz
P
F
= 3 dBm, OMI = 10% each
2-tone test: f1=7MHz, f2=56MHz
20 km of fiber
(7.5 dB total loss with connector) f1 + f2
P
F
= 3 dBm, OMI = 10% each
2-tone test: f1=7MHz, f2=56MHz
20 km of fiber
(7.5 dB total loss with connector) 2f2-f1
Min
-
Typ
-
Max
1
Unit
dB
p-p
DSO
-
-
-
-
-52
-58
dBc
Third Order Distortion
Standard Linearity
Enhanced Linearity
DTB
-
-
-
-
-63
-65
dBc
1. I
op
, T
case
= 25C. Test with the laser Input pin matched to a 50 system.
2. I
op
, T
case
= 25C. Test with laser input pin matched to a 75 system.
| REV 2012.08
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.
1935 F/R/W Coaxial DFB Laser Diode
O-Band CWDM 5 MHz – 4000 MHz
DATASHEET | AUGUST 2012
FIBER OPTICS
Wide Bandwidth Path RF Characteristics
1935W 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
= 25C. Test with the laser Input pin matched to a 50 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 = 2700MHz, F2 = 2703MHz, RF in = 0dBm/frequency. 0km fiber.
3. Test at 2700MHz. 0km fiber.
Package Outline Drawing (dimensions are in mm)
Mounting Bracket
| REV 2012.08
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.
1935 F/R/W Coaxial DFB Laser Diode
O-Band CWDM 5 MHz – 4000 MHz
DATASHEET | AUGUST 2012
FIBER OPTICS
Reliability/Quality
Designed to meet qualification requirements of Telcordia
TM
(Bellcore) GR-468-CORE.
Schematic and Pinout
Schematic and Pinout A
3
PD
4
2
LD
1
Pin Definitions for Pinout A
Pin
1
2
3
4
Description
LD Anode, Case Ground
LD Cathode
PD Cathode
PD Anode
Pinout A
Bottom View
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 = 1.3
m.
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 2012.08
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.
我最近在《华尔街日报》看到一篇题为“我们需要能维修自己的电子小玩意儿的权利(We need the right to repair our gadgets)”的文章(参考原文：)，作者对于众多电子产品看来是“有计画的废弃(planned obsolescence)”之现象非常愤怒，认为大众应该要求电子产品可以被维修。 但实际的情况是，举例来说，家家都有的电视机如果故障了，修理费用可能...[详细]
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