DFB Laser Diodes:

Learn More About DFB Laser Diodes

This grating creates a one-dimensional interference grating, providing optical feedback. Essentially, this process allows only one wavelength to emit from the diode, rather than one center wavelength with a couple of lower power side wavelengths that you typically get from a standard Fabry-Perot laser diode. Distributed Feedback (DFB) Laser Diodes are single-frequency and offer a Narrow Linewidth with good side mode suppression ratio (SMSR).

Discreet-Mode (DM) Laser Diodes offer very similar performance to DFB Lasers. Discreet-Mode Laser Diodes are produced with a simple and low-cost fabrication process and have many advantages. For example, they have very high side mode suppression ratio, stable operation over a broad temperature range, narrow linewidth and low sensitivity to optical feedback. DM laser diodes are often described as DFB-like laser diodes.

Our Distributed Feedback DFB Laser Products

DFB laser diodes are available in free-space and fiber pigtailed versions, with wavelengths in the NIR, SWIR, & LWIR (from ≈1260nm to 16µm) spectral regions, providing narrow linewidths and up to 50mW output. Furthermore, packages include HHL, TO-Can, and fiber-coupled butterfly options. Finally, we offer a wide range of wavelengths and output powers to choose from in our DFB Lasers.

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Deeper Dive into Distributed Feedback Lasers

Some DFB Laser Applications

Some popular DFB laser applications include various forms of gas sensing (e.g., molecular spectroscopy, TDLAS or tunable diode laser absorption spectroscopy), interferometry, fiber sensing, fiber optic communication, LIDAR, DIAL, and night vision applications.

Laser Diodes for Gas Sensing: Mode-Hop-Free Tunability with High SMSR

In a hypothetically perfect laser, all of the laser power produced would be contained within the main spectral peak. However, in reality, the power distribution is not as ideal and the side peaks or side modes of the laser profile contain some percentage of the total output power. A Distributed Feedback (DFB) laser’s side-mode suppression ratio (SMSR) is a value that explains the amplitude delta between the main mode and the most significant side mode in decibel units (noise ratio). A typical SMSR value would be greater than 30dB, which indicates that most of the power resides in the main spectral peak. High-quality, high-performance DFB laser diodes boast even higher SMSR values, and thus generate a greater ratio of total power within the main mode, compared to the side modes.

Read the full article here.

Groundbreaking New QCL Wavelength Range from 10µm to 17µm!

A new class of Distributed Feedback (DFB) QCLs has been developed at the University of Montpellier, France, in a joint laboratory with CNRS. The unique aspect is the use of different III-V semiconductor materials to fabricate the active region of the lasers. These materials are part of the antimonide family, a specialty of the University of Montpellier for decades. The foundation of QCLs consists of artificial heterostructure alternating nanometer-scale quantum wells and barrier layers. While the standard QCL uses InGaAs and AlInAs on an InP substrate – the basis of the optoelectronics telecom industry – this novel QCL technology is based on InAs and AlSb. These materials’ specific properties enabled the expansion of QCL wavelength range from 2.6µm to 25µm [1, 2]. High-performance laser sources have been demonstrated recently in the range 10 to 20µm [3-5], with powers in the milliwatts range emitted at room temperature in a continuous wave. An efficient DFB process was also demonstrated for the fabrication of single-frequency tunable lasers suitable for spectroscopy applications [6]

Read the full article here.

How Can We Help?

With over 25 years experience providing distributed feedback DFB lasers to researchers and OEM integrators working in various markets and applications, and 1000s of units fielded, we have the experience to ensure you get the right product for the application. Working with RPMC ensures you are getting trusted advice from our knowledgeable and technical staff on a wide range of laser products.  RPMC and our manufacturers are willing and able to provide custom solutions for your unique application.

If you have any questions, or if you would like some assistance please Contact Us here. Furthermore, you can email us at [email protected] to talk to a knowledgeable Product Manager.

Alternatively, use the filters on this page to assist in narrowing down the selection of distributed feedback DFB lasers for sale. Finally, head to our Knowledge Center with our Lasers 101 page and Blogs, Whitepapers, and FAQ pages for further, in-depth reading.

Check out our Online Store: This page contains In-Stock products and an ever-changing assortment of various types of new lasers at marked-down/discount prices.