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    • 1398nm 20mW DFB Laser Diode for H2O Sensing

    1398 nm distributed feedback (DFB) laser diode module is a cost-effective laser source with high coherence. The DFB laser diode chip is housed in an industry-standard hermetically sealed 14‑pin butterfly package, integrated with a thermoelectric cooler (TEC) and a photodetector (PD).This module is designed for both performance and practicality. The hermetic package enhances stability in harsh environments, the built‑in TEC enables precise temperature control to ensure wavelength stability, and the PD allows real‑time monitoring of laser output power. It is well suited for applications requiring high coherence and wavelength accuracy, such as gas sensing, optical fiber communications, and spectroscopic analysis.

    Product features：Narrow linewidth: < 2 MHz; industry-standard 14-pin butterfly package; excellent wavelength control and stability; mode-hop-free tuning; high reliability; customer-specific wavelengths available

    Part Number：MP-DFB-1398-20-A81-14BF-PA

    Application area：Tunable Diode Laser Absorption Spectroscopy | H₂O (gas) monitoring

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    Main parameters
  • Core parameters

  • Central Wavelength Output Power

    1398nm 20mW

  • Dimension Drawing
    • General Parameters

    Detailed Parameters

    Specification Table

    Electrical / Optical Characteristics (Tsub = 25 °C, CW bias, unless otherwise specified)

    Parameter

    Symbol

    Min.

    Typ.

    Max.

    Unit

    Center Wavelength

    λ

    1397.5

    1398

    1398.5

    nm

    Side-Mode Suppression Ratio

    SMSR

    30

    40

    —

    dB

    Threshold Current

    Ith

    —

    20

    30

    mA

    Operating Current

    Iop

    —

    80

    120

    mA

    Chip Output Power

    Pf

    15

    20

    30

    mW

    Quantum Efficiency

    η

    0.08

    0.12

    —

    mW/mA

    Current Tuning Coefficient

    ∆λ/∆I

    —

    0.015

    —

    nm/mA

    Temperature Tuning Coefficient

    ∆λ/∆T

    —

    0.12

    —

    nm/K

    Forward Voltage

    Vf

    —

    1.3

    2

    V

    Thermistor Resistance

    RT

    9.5

    10

    10.5

    kΩ

    Thermistor Temperature Coefficient

    —

    —

    -4.4

    —

    %/℃

     

    Spectrum Diagram

    4.6.jpg


    L-I Curve

    1399.png

     

     

    DFB Laser Linewidth Test Results

    image.png

     

    Wavelength Stability

    image.png 


    Mode-hop-free tuning range

    1398.jpg 


    Beam Quality

     

     image.png

    2D

    image.png 

    3D


     

    Image Analysis

    image.png

     

    Pin Definition：

    image.png 

     

    Pin #

    Definition

    Pin #

    Definition

    1

    Thermistor

    8

    Case Ground

    2

    Thermistor

    9

    Case Ground

    3

    LD(-)

    10

    NC

    4

    Detector (+)

    11

    LD(+)

    5

    Detector (-)

    12

    LD(-), RF

    6

    TEC (+)

    13

    LD(+)

    7

    TEC (-)

    14

    NC

     

    Absolute Maximum Ratings:

    Parameter

    Unit

    Min.

    Typ.

    Max.

    Case Temperature

    ℃

    -5

    25

    70

    Chip Temperature

    ℃

    10

    25

    40

    Operating Current

    mA

    0

    100

    150

    Forward Voltage

    V

    0.8

    1.2

    1.8

    TEC Current

    A

    —

    —

    1.2

    Reverse Voltage (LD)

    V

    —

    —

    2

    Reverse Voltage (PD)

    V

    —

    —

    20

     

    Ordering Information:

    MP-DFB-□□□□-☆-A8▽-XX

    **□□□□: Wavelength

    1398: 1398nm

    1512: 1512nm

    1567: 1567nm

    1570: 1570nm

    *****

    1653.7: 1653.7nm

    ☆ : Output Power

    A: 15mW

    B: 20mW

    ▽: Wavelength Tolerance

    1: ±1nm

    2: ±2nm

    XX: Fiber and Connector Type

    SA=SMF-28E+ FC/APC

    SP=SMF-28E+ FC/PC

    PP=PM Fiber+ FC/PC

    PA=PM Fiber+ FC/APC


    Optional Configurations

    --

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  • Product title: 1398nm 20mW DFB Laser Diode for H2O Sensing
  • Product link: https://www.idealphotonics.com/product/detail/1262.html

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