Coaxial Pigtailed Laser Module
Technical Data
Features
•Compact Coaxial Package
•Strained Multi Quantum Well (SMQW) Laser Chip
•Low Thresholds Current and Operating Currents
•Wide Operating Temperature -40°C to +85°C
•Optical Power May Be Customized up to 2 mW
•Modulation Capability up to 622 Mb/s
•Convenient Variety of Pinout and Mounting Flange Options
Description
Products in the LST2X2X family are compact coaxial pigtailed laser transmitters, operating in the 1300 nm wavelength region and coupling light to single mode fiber. They are designed for use in short, medium and long distance networks with bit rates up to 622 Mb/s.
The device features a high reliability SMQW laser diode and rear facet monitor photodiode. These are electrically connected to four pins in an industrystandard configuration.
Applications
•Telecommunications
•Fiber in the Loop
•Inter/Intra Office
•SONET/SDH
•Datacommunications
•Switches
Environmental performance is designed to be compatible with the requirements of Bellcore’s TA-NWT-000983 document.
Options within the LST2X2X family offer pinouts and pin rotational orientations designed to match existing products
LST252X - 200 μW Coaxial Laser
LST282X - 1 mW Coaxial Laser
LST292X - 1.6 mW Coaxial Laser
LST3X21 - Dual-in-Line Package
available on the market. We also offer a comprehensive range of alternative mounting flanges including a dual in line option.
If the specific arrangement or performance you require is not listed, please contact your local representative as our highly flexible design and manufacturing processes allow both physical and electro-optical customization to meet your needs.
Laser Safety Warning
This device is a Class IIIb (3b) Laser Product. It may emit invisible laser radiation if operated with the fiber pigtail disconnected. To avoid possible eye damage do not look into an unconnected fiber pigtail during laser operation. Do not exceed specified operating limits.
520 |
5965-7336E (4/97) |
Absolute Maximum Ratings
Absolute limiting (maximum) ratings mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods, provided that each limiting parameter is in isolation and all other parameters have values within the performance specification. It should not be assumed that limiting values of more than one parameter can be applied to the product at the same time.
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Limits |
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Parameter |
Symbol |
Test Condition |
Min. |
Max. |
Units |
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Laser Forward Current |
If |
DC |
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120 |
mA |
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Laser Reverse Voltage |
Vlr |
DC |
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2 |
V |
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Photodiode Reverse Voltage |
Vr |
DC |
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20 |
V |
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Photodiode Forward Current |
Ipf |
DC |
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1 |
mA |
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Operating Temperature |
Tc |
Temperature measured at case |
–40 |
+85 |
°C |
Storage Temperature |
Ts |
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–40 |
+85 |
°C |
Relative Humidity |
RH |
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noncondensing |
%RH |
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Fiber Pull Strength |
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Three times; 10 sec. |
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10 |
N |
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Mechanical Shock |
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MIL-STD-883D, Method 2002, |
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500 |
G |
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Condition A |
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Vibration |
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MIL-STD-883D, Method 2007, |
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20 |
G |
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Condition A |
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Performance Specifications
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LST252X |
LST282X |
LST292X |
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LST3521 |
LST3821 |
LST3921 |
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Parameter |
Symbol |
Test Condition |
Min. |
Max. |
Min. |
Max. |
Min. |
Max. |
Units |
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LASER |
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CW, Tc = –40°C to |
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+85°C, Po as noted |
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below unless otherwise |
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stated |
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Rated Optical Power |
Po |
Tc = ranges specified |
0.2 |
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1.0 |
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1.6 |
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mW |
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above, CW |
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Threshold Current |
Ith |
Tc = +25°C |
3.5 |
10 |
3.5 |
10 |
3.5 |
10 |
mA |
Threshold Current |
Ith |
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1.5 |
30 |
1.5 |
30 |
1 |
30 |
mA |
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Coupled Power in |
Pth |
If = Ith – 2 mA |
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10 |
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10 |
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10 |
μW |
“Off” State |
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Slope Efficiency |
η |
Tc = +25°C |
10 |
16 |
50 |
80 |
80 |
128 |
μW/mA |
Drive Current above |
Id |
Tc = +25°C |
12.5 |
20 |
12.5 |
20 |
12.5 |
20 |
mW |
Ith, for Im = Im |
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Tc = –40°C to +85°C |
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(Po, +25°C) |
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10 |
33.3 |
10 |
33.3 |
10 |
33.3 |
mA |
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Forward Voltage |
Vf |
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1.6 |
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1.6 |
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1.6 |
V |
Center Wavelength |
λ |
Tc = +25°C |
1286 |
1336 |
1286 |
1336 |
1286 |
1336 |
nm |
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Tc = –40°C to +85°C |
1260 |
1360 |
1260 |
1360 |
1260 |
1360 |
nm |
Wavelength/ |
Δλ/ T |
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0.4 |
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0.4 |
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0.4 |
nm/°C |
Temperature |
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Coefficient |
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Spectral Width |
σ |
One sigma, RMS |
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2.5 |
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2.5 |
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2.5 |
nm |
Rise and Fall Time |
τ |
10-90%, Ith to Po |
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0.5 |
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0.5 |
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0.5 |
ns |
521