In recent years, LIDAR technology has become a key part of many advanced systems we use today. From self-driving cars and delivery drones to robots and mapping tools, LIDAR helps machines “see” the world around them by using laser light to measure distance.

Behind the scenes, these systems rely on many small, high-tech components that work together to make LIDAR fast, accurate, and reliable. One of these important components is called a 980/1550nm Fused WDM. You might not hear much about it, but it plays a big role in helping LIDAR receiver modules do their job better.

In this blog, we’ll explain what a fused 980/1550nm WDM is, how it works, and why it’s such a valuable part of modern LIDAR systems.

What Is a 980/1550nm Fused WDM?

WDM stands for Wavelength Division Multiplexer. It’s a device used in fiber optics to combine or separate light signals at different wavelengths (which are like different “colors” of light, even if we can’t see them).

The 980/1550nm WDM is designed to work with two specific wavelengths:

  • 980 nanometers (nm) are used to power laser amplifiers.
  • 1550 nm is the wavelength most LIDAR systems use for their signals, because it’s eye-safe and works well over long distances.

The word fused means the device is made by melting and joining two optical fibers together. This method makes the WDM small, strong, and ideal for use in devices where space is limited, like LIDAR receivers.

Why It Matters in LIDAR Receiver Modules

A LIDAR system sends out a laser pulse and waits for the light to bounce back from objects. When that reflected light returns, it’s usually very weak. That’s why most LIDAR receivers use an optical amplifier to make the signal stronger before it’s detected.

Here’s where the 980/1550nm fused WDM comes in. The amplifier needs two types of light:

  • The returning signal (at 1550nm)
  • A laser pump (at 980nm) that powers the amplifier

The WDM combines both light paths into one fiber, so the amplifier can work efficiently. After boosting the signal, the 980nm pump light is removed, and the stronger 1550nm signal is sent to the detector.

Without the WDM, the system would need more parts, making it larger, harder to build, and more expensive.

Benefits of Using Fused 980/1550nm WDMs

Boosts Signal Strength

It helps make weak return signals strong enough to be detected clearly.

Saves Space

Combining two signals in one fiber makes the whole system smaller and easier to store.

Reduces Signal Loss

These WDMs have been created to lose as little light as possible, keeping signal quality high.

Cuts Costs

Fewer parts mean simpler design, easier manufacturing, and lower overall cost.

Where Are 980/1550nm Fused WDMs Used?

980/1550nm fused WDMs are found in many different LIDAR-based technologies:

  • Self-driving cars to spot other vehicles, people, and road signs.
  • Robots to avoid bumping into things.
  • Surveying equipment to scan land or buildings accurately.
  • Aerospace systems to navigation or terrain tracking.

Final Thoughts

980/1550nm Fused WDMs might be small and unseen by most users, but they play a powerful role in how LIDAR systems work. By helping combine and manage light signals, they make LIDAR receivers more efficient, compact, and effective. As LIDAR continues to grow in use, these simple components will remain a key part of advanced sensing technologies.