D1861A 10 Gbits/s 1310 nm DML Module
Data Sheet
August 2000
Features
s
Direct-modulated 1310 nm laser module character-
ized for use in 10 Gbits/s operations up to 50 km
s
Average optical output power, 4 mW min.
s
Temperature stabilized with internal thermoelectric
cooler (TEC), enabling operation within a wide
temperature range of 40 C to +80 C
s
Hermetically sealed optics, isolator on TEC
s
GPO*
RF connector
s
Single-mode fiber pigtail
s
High relaxation frequency at low bias
Applications
s
SONET/SDH low-cost metro applications
s
High-speed data communications
s
DWDM equipment drop-side applications
*
GPO
is a trademark of Gilbert Engineering Co., Inc.
Description
The D1861A direct-modulated laser (DML) module is
a cost-effective solution for 10 Gbits/s digital trans-
mission up to 50 km using traditional intracity SMF28
single-mode fiber links. The 1310 nm wavelength
eliminates the need for concern about dispersion
control over most installed intracity fiber plants. The
package contains a high-speed DFB laser chip, ther-
moelectric cooler, thermistor, optical isolator, and a
rear-facet monitor photodiode, which allows for exter-
nal optical power control.
Figure 1. D1861A DML Electrical Schematic
Pin Information
1. Laser anode is case ground mAp-p drive current.
2. A positive current into this pin cools the laser.
Table 1. Pin Descriptions
Pin No.
Description
1
Thermistor
2
Thermistor
3
Laser Cathode (), dc Bias
1
4
MPD Anode, (Negative Bias MPD)
5
MPD Cathode
6
Thermoelectric Cooler (+)
2
7
Thermoelectric Cooler ()
ESD
PROTECTION
TEC
7
6
5
4
3
2
1
+
+
RF
R
MATCH
45
R
TH
10 k
@ 25 C
ISOLATOR
RF CONNECTOR
MPD
DFB
CHOKE
1-1157(F)
2
Agere Systems Inc.
Data Sheet
D1861A 10 Gbits/s 1310 nm DML Module
August 2000
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute 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. RF input shall be ac coupled. It is recommended that a series induc-
tor of 100
H be placed external to the device on Pin 3.
1. RF connector ac coupled.
Electrical/Optical Characteristics
1. 10 Gbits/s PRBS 2
23
1, E
R
= 8.2 dB, @ I
OP
, T
OP
= 25 C, typical 50 mApp drive current.
2. Measurements made with 100
H in series with pin 3 (laser cathode).
Parameter
Symbol
Condition
Min
Max
Unit
Operating Temperature Range
T
OP
--
40
80
C
Storage Case Temperature Range
Tstg
--
40
85
C
Laser Forward Bias
--
TEC On
--
150
mA
Pin 3, Max. Positive Voltage
1
V
R
--
--
1
V
Pin 3, Max. Positive Current
1
I
R
--
--
200
mA
Reverse Voltage Photodiode
V
RPD
--
--
20
V
TEC Current
I
TEC
--
--
1.7
A
Table 2. Electrical and Optical Characteristics (Case Temperature, 40 C to + 80 C; Laser Temperature, 25 C
unless otherwise noted.)
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Average Optical Output Power
P
O
I
OP =
I
TH
+ 30 mA
4
--
--
mW
Threshold Current (BOL)
I
TH
--
2
--
30
mA
Wavelength
--
1290
--
1320
nm
Wavelength Tuning Coefficient
T
--
--
0.085
--
nm/C
External Efficiency
--
0.125
0.15
--
W/A
ac Side-mode Suppression Ratio
SMSR
I
OP
35
--
--
dB
Chromatic Dispersion Penalty
(50 km, SMF28, 200 ps/nm)
--
--
1
--
--
1.0
dB
Optical Isolation
--
--
32
--
--
dB
High-frequency Cutoff (3 dB)
F
HIGH
I
OP
2
14
--
--
GHz
Low-frequency Cutoff (3 dB)
F
LOW
I
OP
2
--
--
30
kHz
RF Return Loss, 50
(0.1 GHz--8 GHz)
IS
11
I
I
OP
10
--
--
dB
Rise/Fall Time, 10%--90%
t
R
/t
F
--
1
--
--
50
ps
Thermoelectric Cooler Current
I
TEC
--
--
--
1.3
A
Thermistor Resistance
R
TH
--
9.5
10
10.5
k
Thermistor Coefficient
--
--
--
4.4
--
%/C
Monitor Photodiode Current
I
MPD
I
OP
40
--
1500
A
3
Agere Systems Inc.
Data Sheet
August 2000
D1861A 10 Gbits/s 1310 nm DML Module
Characteristic Curve
Figure 2. Filtered Optical Eye Pattern (0 km, Fourth
Order Bessel Filter, 8.2 dB ER, 20 ps/div)
Outline Diagram
Dimensions are in inches and (millimeters).
0.365
9.09)
(9.45
0.228
5.61)
(5.97
0.040
0.84)
(1.19
RF INPUT
GPO OR SMP
0.248
6.12)
(6.45
FIBER AND BEND LIMITER
MAINTAIN FIBER BEND RADIUS
GREATER THAN 1.5"
LIMITED DETENT
0.164 DIA
CONNECTOR
0.350
8.71)
(9.07
0.078
1.80)
(2.16
0.318
7.90)
(8.26
0.420
10.49)
(10.85
1.025
25.86)
(26.21
LEADS
0.008" THICK x 0.030" WIDE
0.400" MIN. LENGTH
6 SPCS @ 0.100" (0.254)
0.600
(15.00)
PIN 1
0.212
5.21)
(5.56
0.820
(20.80)
1.180
(30.00)
0.105 DIA
4 PLCS
0.500
12.52)
(12.88
0.250
6.17)
(6.53
0.190
4.65)
(5.00
0.048
1.04)
(1.40
0.215 0.010
(5.50 0.30)
1-1156(F)
4
Agere Systems Inc.
Data Sheet
D1861A 10 Gbits/s 1310 nm DML Module
August 2000
Laser Safety Information
Class IIIb Laser Product
FDA/CDRH Class IIIb laser product. All versions are Class IIIb laser products per CDRH, 21 CFR 1040 Laser
Safety requirements. All versions are Class 3B laser products per
IEC
* 60825-1:1993. The device has been classi-
fied with the FDA under an accession number to be determined.
This product complies with 21 CFR 1040.10 and 1040.11.
SMF28 single-mode fiber pigtail and connector
Wavelength = 1.3
m
Maximum power = 30 mW
Because of size constraints, laser safety labeling is not affixed to the module but attached to the outside of the ship-
ping 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.
*
IEC
is a registered trademark of The International Electrotechnical Commission.
DANGER
INVISIBLE LASER RADIATION
IS EMITTED FROM THE END
OF FIBER OR CONNECTOR
Avoid direct exposure to beam
Do not view beam directly with
optical instruments
INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR
Avoid exposure to beam
Class 3B Laser Product IEC-60825M 1993 Max. Output: 30 mW
Wavelength: 1.3
m
5
Agere Systems Inc.
Data Sheet
August 2000
D1861A 10 Gbits/s 1310 nm DML Module
Ordering Information
1. Other options available. For additional ordering information, please contact an Agere Systems account manager at Opto West, 1-800-362-
3891 (for sales staff, please press option 2).
2.
SMF-28
is a trademark of Corning Incorporated.
Table 3. Ordering Information
1
Device Code
Description
Connector
Pigtail
Comcode
D1861A023
10 Gbits/s DML,
1310 nm
FC/SPC
SMF-28
2
(1 m min.)
108870015
D1861A040
10 Gbits/s DML,
1310 nm
SC/UPC
Standard
SMF-28
2
(1 m min.)
108870023
D1861A050
10 Gbits/s DML,
1310 nm
LC
SMF-28
2
(1 m min.)
108870031
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