
Optoway                          
BTRS-7940CG
*********************************************************************************************************************************************************************** 
BTRS-7940CG / BTRS-7940C-SPG 
1490 nm  TX/ 1310 nm RX , 3.3V / 1250 Mbps 
RoHS Compliant
 Single-Fiber Transceiver 
***********************************************************************************************************************************************************************
FEATURES 
l
Bi-Directional Single-Fiber Transceiver 
l
Compliant with IEEE 802.3ah 1000BASE-BX 
l
1490 nm DFB LD Transmitter 
l
1310 nm Receiver  
l
20 dB Power Budget At Least 
l
Link distance up to 40 km 
l
Industry Standard 1 x 9 Footprint 
l
Single +3.3 V Power Supply 
l
RoHS Compliant 
l
0 to 70
o
C Operating 
l
LVPECL Differential Inputs and Outputs 
l
LVTTL Signal Detect Output 
l
Wave Solderable and Aqueous Washable 
l
Class 1 Laser International Safety Standard IEC-60825 
Compliant 
APPLICATIONS 
l
WDM Gigabit Ethernet  Links 
l
SONET/SDH Equipment Interconnect 
l
Fiber Channel Links 
ORDER INFORMATION 
P/No.
IEEE 
802.3ah 
1000BASE 
BTRS-7940CG 
BX 
1.25 
40 
1490 DFB 
1310 
Note: 1. BTRS-XXXXXG is SC/PC receptacle type package with  standard case 
          2. BTRS-XXXXXEG is SC/PC eceptacle type package with extended case 
          3. BTRS-XXXXX-APBBBG is 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. 
Absolute Maximum Ratings 
Parameter 
Symbol 
Min 
Storage Temperature 
Tstg 
-40 
Operating Temperature 
Topr 
0 
Soldering Temperature 
--- 
Power Supply Voltage 
Vcc 
0 
Input Voltage 
--- 
GND 
Output Current 
Iout 
0 
Recommended Operating Conditions 
Parameter 
Symbol 
Min 
Power Supply Voltage 
Vcc 
3.13 
Operating Temperature 
Topr 
0 
Data Rate 
Power Supply Current 
Icc 
*********************************************************************************************************************************************************************** 
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 
DESCRIPTION 
The BTRS-7940CG 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 1000BASE-BX and ITU-T 983.3 application. 
A PECL logic interface simplifies interface to external 
circuitry. LVTTL signal Detect is used. 
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. 
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 
3.3 
SC, 2X5  
0 to 70 
-23 
Yes 
Max 
85 
70 
260 
3.6 
Vcc 
30 
Units 
o
C 
o
C 
o
C 
V 
V 
mA 
Notes 
air flow 1m/sec 
10 seconds on leads only 
Typ 
3.3 
1250 
Max 
3.47 
70 
1300 
280 
Units / Notes 
V 
o
C  /air flow 1m/sec 
Mb/s 
mA