DFB Laser Diodes

The Select Wavelength Laser Diodes SWLD series laser is specifically developed fbr wavelength division multiplexing (WDM) systems. Selected wavelengths comply with ITU recommendations, both in channel definition of CWDM Wavelengths( 1270 to 1610nm),thus adhering to the 20nm grid and in channel definition of DWDM Wavelengths( 1527.22 to 1610.92nm),thus adhering to the 100GHz grid(0.8nm) relative to a frequency. It is available in a hermetic sealed 14-pin butterfly package. These lasers utilize DFB Laser Diodes, which offer excellent performance in high-speed, precise wavelength applications.

The laser diodes contain thermoelectric cooler (TEC), thermistor, monitor PD and optical isolator to secure high quality laser performance. We also have full customer selection of output powers, package types and output fibers of SM fibers, PM fibers and other special fibers. Fibermart laser products are Telcordia GR-468 qualified, and in compliance with RoHS directives.

Introduction

The Select Wavelength Laser Diodes (SWLD) series represents precision-engineered optical sources specifically developed for Wavelength Division Multiplexing (WDM) systems. These lasers provide exact, stable wavelengths that are critical for maximizing channel density and signal integrity in modern optical networks. Available in hermetic 14-pin butterfly packages and utilizing Distributed Feedback (DFB) technology, they offer exceptional performance for high-speed, precise-wavelength applications. With wavelengths compliant to both the 20nm CWDM and the 100GHz DWDM ITU grids, and featuring integrated components for stability, the SWLD series is the definitive choice for demanding telecommunications, data center interconnect, and broadband transmission systems.

Features

● ITU Grid Wavelength Compliance for both CWDM (1270-1610nm, 20nm spacing) and DWDM (C-band, 100GHz/0.8nm spacing) systems.

● High-Performance DFB Laser Diode Core ensuring single-mode, narrow-linewidth output with superior side-mode suppression.

● Integrated Stabilization Components including a Thermoelectric Cooler (TEC), thermistor, monitor photodiode, and optical isolator within the package.

● Hermetic 14-Pin Butterfly Package ensuring long-term reliability and performance stability in demanding environments.

● Flexible Output Configurations with customer selection of output power, and optional single-mode or polarization-maintaining (PM) output fibers.

● Industry Standard Compliance qualified to Telcordia GR-468 and compliant with RoHS environmental directives.

● 100% Tested with individual Testing Report, CE, RoHS, FCC, ISO9001 Certificated for each unit to ensure High performance and Zero Failure in Lifetime Warranty.

Principles

A Distributed Feedback (DFB) laser diode operates on the principle of generating light within a structured cavity that defines its precise output wavelength. Unlike standard lasers, the active region of a DFB laser contains a permanent, built-in diffraction grating (a corrugated layer) that runs along the length of the cavity. This grating acts as a one-dimensional interference filter, selectively reflecting only a very specific wavelength of light back into the gain medium through Bragg scattering.

This integrated grating provides continuous optical feedback and forces the laser to oscillate in a single, stable longitudinal mode. The result is an output with an extremely narrow spectral linewidth and high wavelength stability, which is minimally affected by temperature or drive current fluctuations. This makes DFB technology ideal for WDM systems, where dozens or hundreds of lasers must operate at tightly spaced, distinct wavelengths without interference.

Fibermart Laser Diodes Pin Assignments:

Applications

● DWDM & CWDM Transmission Systems as the primary source lasers for long-haul, metro, and regional optical networks.

● Fiber-to-the-Home (FTTH) Networks utilizing specific wavelengths like 1490nm for downstream data and 1550nm for video overlay.

● CATV/HFC Broadcast Transmitters employing high-linear 1310nm or 1550nm DFB lasers for analog and digital video signal distribution.

● Precision Test & Measurement Equipment serving as stabilized light sources for optical component characterization and system troubleshooting.

● Data Center Interconnect (DCI) and high-speed enterprise networks requiring reliable, wavelength-specific sources for coherent and direct-detect technology.