
Optoway                                             
BTR-7940G
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BTR-7940G / BTR-7940-SPG 
1490 nm  TX / 1310 nm RX , 3.3V / 1.25 Gb/s 
RoHS Compliant
 Single-Fiber Transceiver 
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FEATURES 
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Bi-Directional Single-Fiber Transceiver 
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14910 nm DFB LD Transmitter 
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1310 nm Receiver  
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20 dB Power Budget At Least 
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Link distance up to 40 km 
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Industry Standard 1 x 9 Footprint 
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Single +3.3 V Power Supply 
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RoHS Compliant 
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0 to 70
o
C Operating 
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LVPECL Differential Inputs and Outputs 
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LVPECL Signal Detect Output: BTR-7940G 
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LVTTL Signal Detect Output: BTR-7940CG 
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Wave Solderable and Aqueous Washable 
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Class 1 Laser International Safety Standard IEC- 60825 
Compliant 
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OPTOWAY TECHNOLOGY INC. 
No
.3
8, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 
                            Tel: 886-3-5979798                       Fax: 886-3-5979737 
                            E-mail: sales@optoway.com.tw     http: // www.optoway.com.tw     10/1/2005    V2.0
1 
APPLICATIONS 
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WDM 1.25 Gb/s Links 
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SONET/SDH Equipment Interconnect 
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Fibre Channel 1.063 Gb/s Links 
DESCRIPTION 
The BTR-7940G series is high performance module for 
single fiber communications by using 1490 nm transmitter 
and 1310 nm receiver. The transmitter  section  uses  a  
multiple  quantum well 1490 nm DFB laser  and is a class 1 
laser compliant according to International Safety Standard 
IEC-60825. The receiver section is designed to receive 1310 
nm and block 1490 nm signal. This feature is suitable for 
IEEE 802.3ah and ITU-T 983.3 application. The receiver 
section uses an integrated 1310 nm detector preamplifier 
(IDP) mounted in an optical header and a limiting 
post-amplifier IC. A PECL logic interface simplifies 
interface to external circuitry. 
LASER SAFETY
This single mode transceiver is a Class 1 laser product. It 
complies with IEC-60825 and FDA 21 CFR 1040.10 and 
1040.11.  The transceiver must be operated within the 
specified temperature and voltage limits. The optical ports of 
the module shall be terminated with an optical connector or 
with a dust plug. 
ORDER INFORMATION 
P/No.
1000 
BASE 
Bit Rate 
(Gb/s)
Distance 
(km) 
TX 
(nm) 
RX 
(nm) 
Voltage 
(V) 
Package 
Temp 
(
o
C) 
TX 
Power 
(dBm) 
2 to -3 
RX Sens. 
(dBm) 
RoHS 
Compliant 
BTR-7940G 
Note: 1. BTR-XXXXG is 1X9 SC receptacle type package. 
          2. BTR-XXXX-APBBBG is 1X9 pigtail type package with different connector, A=S is SC connector, A=F is FC 
connector, A=T is ST connector, A=L is LC connector, A=M is MU connector; BBB is the length of fiber in cm. 
BX 
1.25 
40 
1490 DFB 
1310 
3.3 
1X9 
0 to 70 
-23 
Yes