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108870031 Datasheet PDF : 6 Pages
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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.
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.
7
6
5
4
3
2
1
–
+
+
–
–
TEC
MPD
DFB
ESD
PROTECTION
RTH
RF
CHOKE
10 kΩ @ 25 °C
RMATCH
45 Ω
ISOLATOR
RF CONNECTOR
1-1157(F)
Figure 1. D1861A DML Electrical Schematic
Pin Information
Table 1. Pin Descriptions
Pin No.
Description
1
Thermistor
2
Thermistor
3
Laser Cathode (–), dc Bias1
4
MPD Anode, (Negative Bias MPD)
5
MPD Cathode
6
Thermoelectric Cooler (+)2
7
Thermoelectric Cooler (–)
1. Laser anode is case ground mAp-p drive current.
2. A positive current into this pin cools the laser.
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