HP LST3521-SC, LST3521-S4-ST, LST3521-S4-SF, LST3521-S4-SC, LST3521-S4-DN Datasheet

520

Coaxial Pigtailed Laser Module

Technical Data

LST252X - 200 µW Coaxial Laser

LST282X - 1 mW Coaxial Laser
LST292X - 1.6 mW Coaxial Laser
LST3X21 - Dual-in-Line Package

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

Applications

• Telecommunications

• Fiber in the Loop

• Inter/Intra Office

• SONET/SDH

• Datacommunications

• Switches

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.

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

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.

5965-7336E (4/97)

521

Limits

Parameter Symbol Test Condition Min. Max. Units

Laser Forward Current If DC 120 mA
Laser Reverse Voltage Vlr DC 2 V
Photodiode Reverse Voltage Vr DC 20 V
Photodiode Forward Current Ipf DC 1 mA
Operating Temperature Tc Temperature measured at case –40 +85 °C
Storage Temperature Ts –40 +85 °C
Relative Humidity RH noncondensing %RH
Fiber Pull Strength Three times; 10 sec. 10 N
Mechanical Shock MIL-STD-883D, Method 2002, 500 G

Condition A

Vibration MIL-STD-883D, Method 2007, 20 G

Condition A

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.

Performance Specifications

LST252X LST282X LST292X

LST3521 LST3821 LST3921

Parameter Symbol Test Condition Min. Max. Min. Max. Min. Max. Units

LASER CW, Tc = –40°C to

+85°C, Po as noted
below unless otherwise
stated

Rated Optical Power Po Tc = ranges specified 0.2 1.0 1.6 mW

above, CW

Threshold Current Ith Tc = +25°C 3.5 10 3.5 10 3.5 10 mA
Threshold Current Ith 1.5 30 1.5 30 1 30 mA
Coupled Power in Pth If = Ith – 2 mA 10 10 10 µW

“Off” State
Slope Efficiency η Tc = +25°C 1016508080128µW/mA
Drive Current above Id

Tc = +25°C 12.5 20 12.5 20 12.5 20 mW

Ith, for Im = Im
(Po, +25°C)

Tc = –40°C to +85°C 10 33.3 10 33.3 10 33.3 mA

Forward Voltage Vf 1.6 1.6 1.6 V
Center Wavelength λ Tc = +25°C 1286 1336 1286 1336 1286 1336 nm

Tc = –40°C to +85°C 1260 1360 1260 1360 1260 1360 nm

Wavelength/ ∆λ/∆T 0.4 0.4 0.4 nm/°C
Temperature
Coefficient

Spectral Width σ One sigma, RMS 2.5 2.5 2.5 nm
Rise and Fall Time τ 10-90%, Ith to Po 0.5 0.5 0.5 ns