HP LST3421A-AP, LST2425B-T-AP, LST2425A-T-AP, LST2425A-B-AP, LST3421B-AP Datasheet

Coaxial Pigtailed Laser Module

Preliminary Technical Data

Features

•Compact Coaxial Package

•Strained Multi Quantum Well Distributed Feedback (DFB) Laser Chip

•Low Thresholds Current and Operating Currents

•Wide Operating Temperature -40°C to +85°C

•Excellent Wavelength

Stability with Temperature ~0.1 nm/°C

•Narrow Line Width <1 nm @ -20 dB

•Side Mode Suppression Ratio >-30 dB

•Modulation Capability up to 622 Mb/s

•Convenient Variety of Pinout and Mounting Flange Options

Applications

•Telecommunications

•Fiber in the Loop

•Inter/Intra Office

LST2425X, LST3421X

•SONET/SDH

•Datacommunications

•Switches

Description

Products in the LST242X family are compact coaxial pigtailed DFB 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-DFB laser diode and rear facet monitor photodiode. These are electrically connected to four pins in an industry-standard configuration.

Environmental performance is designed to be compatible with the requirements of Bellcore’s TA-NWT-000983 document.

Options within the LST242X 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.

Preliminary Product Disclaimer

This preliminary data sheet is provided to assist you in the evaluation of engineering samples of the product which is under development and targeted for release during 1997. Until Hewlett-Packard releases this product for general sales, HP reserves the right to alter prices, specifications, features, capabilities, function, manufacturing release dates, and even general availability of the product at any time.

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.

514

(5/97)

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	A	Tc	Temperature measured at case	–40	+85	°C
	B			0	+70	°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

			LST242X
			LST3421
Parameter	Symbol	Test Condition	Min.	Max.		Units
LASER		CW, over operating temperature
		range, Po, as noted below unless
		otherwise stated and –20 dB ORL
Rated Optical Power	Po	Tc = ranges specified above, CW	2			mW
Threshold Current	Ith	Tc = +25°C	4	15		mA
Threshold Current	Ith	Over operating temperature range	2	40		mA
Coupled Power in “Off” State	Pth	If = Ith – 2 mA	0	10		μW
Drive Current above Ith,	Id	Tc = +25°C	12.5	25		mA
for Im = Im (Po, +25°C)
		Over operating temperature range	-	40		mA
Forward Voltage	Vf			1.6		V
Center Wavelength	λ	Over operating temperature range	1280	1335		nm
Wavelength/Temperature	Δλ/ T			0.1		nm/°C
Coefficient
Spectral Width	σ	At –20 dB		1		nm
Side Mode Suppression Ratio	SMSR		+30			dB
Rise and Fall Time	τ	10-90%, Ith to Po		0.5		ns
MONITOR PHOTODIODE		Tc = +25°C, Vr = 5 V,
		Po = Rated Power
Photocurrent	Im		50	1000		μA
Dark Current	Id	Po = 0 μW		20		nA
Capacitance	C	1 MHz		10		pF
Tracking Error	R	Im = Im (Po, +25°C)	–1	1		dB
		Tc + –40°C to + 85°C

515