1582nm DFB Laser for H2S Gas Sensing

Box Optronics offers a 1582nm+/-1nm distributed feedback laser designed for hydrogen sulfide (H2S) detection using tunable diode laser absorption spectroscopy (TDLAS). The 1582nm DFB Laser for H2S Gas Sensing is housed in an industry-standard 14-pin butterfly package with an integrated thermoelectric cooler (TEC), 10kΩ thermistor, monitor photodiode, and built-in optical isolator, the 1582nm DFB laser provides wavelength stability (0.09nm/°C temperature coefficient, 0.01nm/mA current coefficient) and reliable operation across wide case temperature range.

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Product Description

Product Overview - 1582nm DFB Laser for H2S Gas Sensing

The 1582nm DFB Laser for H2S Gas Sensing from Box Optronics is a high-performance MQW distributed-feedback laser designed for hydrogen sulfide (H₂S) detection and fiber optic sensing. The wavelength accuracy is +/-1nm, the wavelength range is 1581–1583nm , and it delivers 10mW minimum optical output power through SM or PM fiber. The integrated TEC and 10kΩ thermistor support wavelength stabilization, while the 0.01nm/mA wavelength current coefficient enables fine wavelength tuning. A ≥30dB optical isolator reduces back-reflections, and the 14-pin butterfly package with two pinout options provides flexible system integration.

Key Features - 1582nm DFB Laser for H2S Gas Sensing

· Center wavelength: 1582nm , +/-1nm WL tolerance (range 1581–1583nm )

· High optical output power: 10mW / 20mW

· High side-mode suppression ratio: ≥35dB minimum, 40dB typical (CW)

· Built-in optical isolator: ≥30dB isolation

· Integrated thermoelectric cooler (TEC) and 10kΩ thermistor for wavelength stabilization

· Industry-standard 14-pin butterfly package, Type 1 and Type 2 pinout options

· SM fiber or PM fiber pigtail

Typical Applications - 1582nm DFB Laser for H2S Gas Sensing

· Hydrogen sulfide (H2S) gas detection and monitoring using TDLAS

· Wavelength modulation spectroscopy (WMS) for H2S detection

· Industrial H₂S safety and environmental monitoring

· Oil & gas, chemical, and wastewater gas analysis

· Process gas monitoring and emissions analysis

· NIR spectroscopy and gas analytical instruments

· OEM integration into H₂S gas analyzers and industrial safety systems

Product Specifications - 1582nm DFB Laser for H2S Gas Sensing

Absolute Maximum Ratings

Parameter	Symbol	Condition	Min.	Typ.	Max.	Unit
Storage Temperature	Ts	-	-40	-	85	°C
Operating Case Temperature	Top	-	-20	-	70	°C
Forward Current	IF	CW	-	-	200	mA
Laser Reverse Voltage	VLR	-	-	-	2	V
PD Forward Current	IFPD	-	-	1.1	5	mA
PD Reverse Voltage	VRPD	-	-	5	10	V
TEC Current	ITEC	-	-	0.8	1.5	A
TEC Voltage	VTEC	-	-	1.5	3.5	V

Electro-Optical Characteristics (T = 25°C Laser Temperature)

Parameter	Symbol	Test Condition	Min.	Typ.	Max.	Unit
Center Wavelength	λc	TL=15~35°C, CW	1581	1582	1583	nm
Optical Output Power	PO	-	10	-	-	mW
Threshold Current	ITH	-	-	10	35	mA
Slope Efficiency	η	CW, PO=5mW	0.05	0.11	0.2	mW/mA
Operating Current	Iop	PO=10mW, CW	-	100	120	mA
Spectral Linewidth	LW	FWHM	-	3	-	MHz
Laser Forward Voltage	VF	CW, PO=10mW	-	1.2	3.0	V
Monitor Dark Current	ID	-	-	-	0.1	μA
Bandwidth (-3dB)	BW	-	-	2.5	-	GHz
Side-Mode Suppression Ratio	SMSR	CW	35	40	-	dB
Optical Isolation	-	-10<TC<+70°C	30	-	-	dB
Relative Intensity Noise	RIN	CW, PO=5mW	-	-145	-	dB/Hz
TEC Set Temperature	Ts	-	15	-	35	°C
Input Impedance	ZIN	-	22	25	28	Ω
Thermistor Current	ITC	-	10	-	100	μA
Thermistor Resistance	RTH	TL=25°C	9.5	10	10.5	kΩ
TEC Current	ITEC	TL=25°C, TC=70°C	-	-	1.5	A
TEC Voltage	VTEC	TL=25°C, TC=70°C	-	-	3.5	V
TEC Capacity	ΔT	Tc=70°C	-	-	50	°C
Wavelength Drift (EOL)	Δλ	25-year lifetime	-	-	±0.1	nm
Wavelength Temperature Coefficient	Δλ/ΔT	TEC 15°C to 35°C	-	0.09	-	nm/°C
Wavelength Current Coefficient	Δλ/ΔI	-	-	0.01	-	nm/mA

Package and Pin Definition - 1582nm DFB Laser for H2S Gas Sensing

Type 1 Pin Configuration

Pin	Description	Pin	Description
1	Thermistor	14	NC (No Connection)
2	Thermistor	13	Laser Anode (+)
3	Laser DC Bias (Cathode) (-)	12	Laser RF Cathode (-)
4	PD Monitor Anode (-)	11	Laser Anode (+)
5	PD Monitor Cathode (+)	10	NC (No Connection)
6	TEC (+)	9	Case Ground
7	TEC (-)	8	Case Ground

Type 2 Pin Configuration

Pin	Description	Pin	Description
1	TEC (+)	14	TEC (-)
2	Thermistor	13	Case Ground
3	PD Monitor Anode (-)	12	NC (No Connection)
4	PD Monitor Cathode (+)	11	Laser Cathode (-)
5	Thermistor	10	Laser Anode (+)
6	NC (No Connection)	9	NC (No Connection)
7	NC (No Connection)	8	NC (No Connection)

Ordering Information - 1582nm DFB Laser for H2S Gas Sensing

Model Nomenclature

BFLD - XXXX - XX - XX - XX (-X)

Example: BFLD-1582-10SM-FA

Field	Code	Description
Laser Type	BFLD	DFB Laser Diode Series
Wavelength	1582	1582nm (also available: 1310, 1550, CWDM, other wavelengths)
Output Power	10	10mW (also available: 20mW, customized)
Fiber Type	SM / PM	SM = Single-mode (SMF-28e); PM = Polarization-maintaining
Connector Type	FA / SA	FA = FC/APC; SA = SC/APC; Other connectors available
Pinout	NULL / 2	NULL = Type 1 (default); 2 = Type 2

Datasheet and Testsheet - 1582nm DFB Laser for H2S Gas Sensing

datasheet

testsheet

Frequently Asked Questions (FAQ)

Q: Why is 1582nm suitable for H₂S gas sensing?

A: The 1582nm wavelength region contains H₂S absorption features and has been demonstrated for trace H₂S detection using DFB lasers and TDLAS/QEPAS techniques. In TDLAS, the laser wavelength is scanned across the target absorption line, and the resulting absorption is analyzed to determine H₂S concentration. The 1582nm region is also compatible with standard fiber-optic components and mature DFB laser technology. A narrow linewidth and high SMSR enable precise wavelength control for spectroscopic detection.

Q: Why is a built-in optical isolator important for gas sensing systems?

A: Back-reflections from fiber connectors, gas cells, beam splitters, and other optical components can cause optical feedback, leading to output power fluctuations, mode instability, and wavelength instability. A built-in optical isolator with ≥30dB isolation suppresses optical feedback and helps maintain stable laser operation and measurement baselines. Its effectiveness is particularly valuable in fiber-based TDLAS systems with significant optical reflections.

Q: What is the minimum order quantity (MOQ)?

A: The MOQ is 1pc. Small quantities are available for R&D, prototyping, and initial evaluation, while larger volumes can be supported for gas analyzer production and OEM programs. Contact our sales team for pricing based on your required quantity.

Q: Can I get a custom wavelength for a different gas species?

A: Yes. Box Optronics offers DFB lasers at various wavelengths matched to gas absorption features for TDLAS and other spectroscopic applications. Available wavelengths include solutions for H₂S, CO₂, CH₄, H₂O, CO, NH₃, O₂, and other gases. Contact us with your target gas and wavelength requirements for a feasibility review and quotation.