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High Linearity DFB Laser Diode for FMCW LiDAR

Optical module MFLS
Christine Simard

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The high linearity DFB laser diode combines high coherence length and linear frequency modulation response characteristics. This monolithic DFB has been designed to withstand high current modulation bandwidths and it exhibits a stunning linear frequency response. In addition to a native linearity that is 50 times better than standard DFB laser diodes, TeraXion DFB’s unique carrier modulation response enables impressive linearization enhancements through drive-current compensation approaches.

(Picture: DFB/SiP Integrated Multi-wavelength Laser Engine)

 

The next-generation advanced driver assistance (ADAS) and autonomous driving (AD) systems will rely on 3D sensors providing long-range and high-resolution capabilities. While various FMCW LiDAR concepts have already demonstrated such performances, significant challenges remain for LiDARs towards scaling the solutions to mass production requirements in terms of sensor size, complexity, power, and cost.

TeraXion’s DFB laser diode key benefits:

  • Small size monolithic laser taking advantage of a unique epitaxial design based on standard semiconductor materials and compatible with low-cost mass production processes.
  • Low noise and high linearity performances without relying on an external cavity, a complex laser driver scheme or an external frequency modulator.
  • Direct current modulation further contributes to reducing the LiDAR system’s complexity and power consumption.

These characteristics make TeraXion’s DFB laser diode a significant catalyst for overcoming the remaining challenges faced by the automotive LiDAR industry.

TeraXion integrated the high linearity DFB laser diode into the NLM laser module to allow for quick FMCW LiDAR prototyping and proof of concept initiatives.

Applications:

  • Automotive LiDAR for advanced driver assistance systems (ADAS) and autonomous driving (AD), levels 2 to 5
  • High-performance LiDAR for three-dimensional (3D) city mapping and corridor mapping

 

NLM Laser Module Evaluation Kit

 

Top 5 Features

High Linearity

The high linearity DFB laser diode exhibits less than 0.3% residual non-linearity over a few gigahertz frequency excursions. 

Ultra-Narrow Bandwidth

High Coherence Length

The high linearity DFB laser diode exhibits typical 60 kHz linewidth, for a coherence length around 2km.

compact

Ultra-Compact and Stable

The high linearity DFB laser diode is a monolithic design that is smaller than 2 mm² and does not rely on an external cavity to provide high coherence length.

multi channel

Simple and Efficient Modulation

Direct current modulation of the high linearity DFB laser diode represents a simple and power-efficient method.

Cost-Effective

Scalability

The high linearity DFB laser diode epitaxy design allows for high throughput laser wafer production processes.

Critical technical specifications

Label Value

Output Power

Typ. 40 mW

Wavelength

1550 nm

Linewidth

< 100 kHz

Residual Non-linearity

< 0.3%

Frequency Modulation Excursion

> 1 GHz

Relative Intensity Noise at > 1 MHz

< -155 dBc/Hz

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