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

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.

			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

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	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
		Tc = –40°C to +85°C
(Po, +25°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/	Δλ/ 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

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