Data Sheet
August 2000
D1861A 10 Gbits/s 1310 nm DML Module
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.
7
–
6
+
5
+
4
–
3
–
2
1
Features
s
ESD
PROTECTION
TEC
MPD
R
TH
10 kΩ @ 25 °C
Direct-modulated 1310 nm laser module character-
ized for use in 10 Gbits/s operations up to 50 km
Average optical output power, 4 mW min.
Temperature stabilized with internal thermoelectric
cooler (TEC), enabling operation within a wide
temperature range of –40 °C to +80 ° C
Hermetically sealed optics, isolator on TEC
RF
CHOKE
ISOLATOR
DFB
R
MATCH
45
Ω
s
s
RF CONNECTOR
1-1157(F)
s
s
s
s
Figure 1. D1861A DML Electrical Schematic
GPO*
RF connector
Single-mode fiber pigtail
High relaxation frequency at low bias
Table 1. Pin Descriptions
Pin No.
1
2
3
4
5
6
7
Description
Thermistor
Thermistor
Laser Cathode (–), dc Bias
1
MPD Anode, (Negative Bias MPD)
MPD Cathode
Thermoelectric Cooler (+)
2
Thermoelectric Cooler (–)
Pin Information
Applications
s
s
s
SONET/SDH low-cost metro applications
High-speed data communications
DWDM equipment drop-side applications
*
GPO
is a trademark of Gilbert Engineering Co., Inc.
1. Laser anode is case ground mAp-p drive current.
2. A positive current into this pin cools the laser.
AGERE [ AGERE SYSTEMS ]
