LST2425X

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
• SONET/SDH
• Datacommunications
• Switches


Application

• Telecommunications
• Fiber in the Loop
• Inter/Intra Office
• SONET/SDH
• Datacommunications
• Switches


Specifications

Parameter	Symbol	Test Conditions	LST242X LST3421		Units
			Min.	Max.
LASER		CW, over operating temperature range, Po, as noted below unless otherwise stated and 20 dB ORL
Rated Optical Power	P o	Tc = ranges specified above, CW	2	0.2	mW
Threshold Current	I th	Tc = +25°C	4	15	mA
Dark Current	I d	Pf = 0 mW, Tc = ~25°C, Rt = 10 kW	-	20	nA
Forward Voltage	V f			0.6	V
Center Wavelength	l	Over operating temperature range	1280	1335	nm
Wavelength/Temperature Coefficient	Dl/DT			1	nm/°C
Spectral Width	s	At 20 dB		1	nm
Side Mode Suppression Ratio	SMSR		+30		dB
Rise and Fall Time	t	10-90%, Ith to Po		0.5	ns
MONITOR PHOTODIODE	Pth	Tc = +25°C, Vr = 5 V, Po = Rated Power
Coupled Power in "Off" State	I m		50	1000	mA
Dark Current	I d	Po = 0 mW		20	nA
Capacitance	1 MHz	1 MHz		10	pF
Tracking Error	D R	Im = Im (Po, +25°C) Tc + 40°C to + 85°C	-1	1	dB

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.

LST242X 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.