DFB Laser


DFB laser is one type of semiconductor lasers.  DFB lasers use the Bragg reflection of a diffraction grating formed along an active waveguide to unify the laser longitudinal mode. DFB provides high wavelength stability and narrow linewidth.

A DFB laser is a laser diode or optical fiber laser.  DFB Laser has a low linewidth grating that extends throughout the cavity rather than simply at the opposite edges. DFB Laser are single-frequency lasers, with short linewidth and effective side modes.

DFB Laser Linewidth:

Since the cavity length of a DFB is rather short, the DFB Laser Linewidth are typically in the 1 MHz to 10 MHz range.

Here we list the DFB Laser linewidths for different DFB lasers from Different suppliers.

Company Name DFB Laser Product Name Linewidth Product Link Wavelength & Output Power Note
Laser Diode Source 1550nm DFB Laser (400kHz), 8mW 400kHz  RLS/EP1550-NLW-400 1550nm  8mW Eblana's EP1550-NLW-B
INPHENIX INC inphenix  1310nm -1660nm 3mW-20mW 50kHz DFB Laser 1310nm-1660nm 1310nm 1520nm 1550nm 1660nm USA Company
Thorlabs, Inc 1555nm 1642nm-1654nm 50kHz DFB1550 DFB1642  DFB1650P 1555nm 1642nm-1654nm Butterfly Package
INNOLUME  968nm-986nm 1300nm-1330nm 1 MHz DFB09XX000YY030MFXXX 1120nm-1200nm 1200nm-1280nm DORTMUND | GERMANY
NANOPLUS 760nm - 14000 nm 3 MHz standard for DFB laser  760.8nm 1278.8nm 1392.0nm SLD FP 
Toptica Single-frequency laser distributed-feedback 500 kHz DFB pro 633 nm, 760 nm .. 3500 nm Mode-hop free tuning 
BeamQ 1550nm 40mW DFB 14PIN 3 MHz 1550nm Butterfly Laser Diode 760nm - 3000nm Wavelength Range 

 

The standard architectures lasers need two mirrors on both sides of the active zone to form optical cavities. DFB laser has diffraction on the active region serves as a wavelength select component and provides feedback through one mirror.


Because of high output power and stability, DFB laser is primarily utilized for high data rate long-distance transmission and clean single-mode operation.