Optical Communications & Networks

Test Solutions that Provide Industry Aligned Results

In today's digital era, the telecommunications industry is continuously evolving to meet the relentless demand for high-speed, reliable networks. Optical technologies connect the world with unparalleled efficiency. From vast fiber-optic networks to cutting-edge photonic devices, it drives innovation and shapes the future of global connectivity.

Since its acquisition of Ando in 2002, Yokogawa has been innovating precision test solutions for the design, validation, manufacturing, installation and maintenance of optical components and network equipment.

Optical Network Diagram

The Trusted Benchmark For Optical Analysis


The Measurement Challenge

Various measurements along an optical network path require specialized equipment optimized to ensure the highest quality with few trade-offs. The correct instrument may depend on the level of accuracy, number of channels, or type of signal being acquired.


This application note introduces free space light measurement jigs for measuring the emission spectrum of a light source that propagates in free space or the optical transmission spectrum of an optical filter. It describes four types of jigs for light sources and one type for filters.


Optical transceivers are one of the indispensable key devices for optical communications that interconvert optical and electrical signals.


Lack of reliable high-speed internet access in rural regions, due to complicated logistics and the considerable costs involved to extend land-based networks to these areas, has inspired a wave of next-generation applications that will provide greater accessibility and reliability. Making use of “space laser” networks, these revolutionary solutions can relay digital traffic via low Earth orbit (LEO) satellite systems to provide low-latency, high-speed broadband services to communities typically beyond the reach of standard wireless and fiber networks.


To accurately measure pulsed light using an optical spectrum analyzer (OSA), it is necessary to understand the characteristics of the OSA and select the appropriate measurement method and settings.

Application Note

We have developed the AQ6375 Optical Spectrum Analyzer  grating-based desktop optical spectrum analyzer, which can measure an optical spectrum over a wide wavelength range from 1.2 to 2.4 m with high wavelength resolution at high speed. Despite the popularity of desktop optical spectrum analyzers in the telecommunication wavelength region, a large-scale optical spectrum measurement system with a monochromator has commonly been used for measuring the long wavelength region, and so there was a need for a desktop optical spectrum analyzer for long wavelengths. Deep optical absorptions appearing in the long wavelength region around 2 m caused by CO2, NOX and H2O are attracting attention in the environmental and medical fields, and thus sensitive measuring equipment by laser absorption spectroscopy using a near infrared semiconductor laser is becoming more popular. With excellent optical spectrum measurement capabilities (high resolution and high speed), operability and maintenance performance, the AQ6375 Optical Spectrum Analyzer optical spectrum analyzer will contribute to the performance improvement and spread of near-infrared semiconductor lasers used in laser absorption spectroscopy.

Product Overviews


    Introducing the new Yokogawa Test&Measurement AQ6380 Optical Spectrum Analyzer. This new OSA includes many sought-after features including:

    • An unprecedented 5 pm wavelength resolution
    • ±5 pm wavelength accuracy
    • 1200 nm to 1650 nm wavelength range
    • 65 dB wide close-in dynamic range
    • 80 dB stray light suppression
    • Automated wavelength calibration
    • Gas purging
    • DUT-oriented interface and test apps
    • Backward-compatible remote interface
    • 10.4in intuitive touchscreen
    • Up to 20x faster measurement
    • Remote operation capabilities


    From visible light to telecommunication bands and even up to applications in the 2000nm region, optical testing professionals count on the Yokogawa Test&Measurement optical testing family of products. For decades, these precision-based optical measuring instruments have met and exceeded the needs of many customers’ experimental requirements. Applicable to a range of uses in R&D, manufacturing, and academia, Yokogawa Test&Measurement OSAs, OTDRs, OWMs, modular manufacturing test systems, and more deliver quality, consistency, ease of use, and market leadership for all manner of optical test applications.




    In this webinar, Michael Kwok will discuss general techniques to measure OSNR for both traditional and modulated optical signals. The goal of the webcast is to provide test engineers with key measurement considerations for performing OSNR measurements using an Optical Spectrum Analyzer or OSA.


    During this webinar you’ll discover more about the outstanding features and benefits of the AQ6380 and how it can be used to enhance your optical research and development.


    As a developer of optical network components, you demand ever greater precision and fast measurement speed from your Optical Spectrum Analyzers. With Yokogawa’s OSA portfolio, including the latest AQ6380 OSA, that is exactly what you get.

    Discover all about the outstanding features of the Yokogawa OSA portfolio and learn how it can be used to enhance R&D projects in this webinar.

Yokogawa Test&Measurement Corporation Releases High Performance AQ6370E Optical Spectrum Analyzer

Yokogawa Test & Measurement Corporation launches the AQ6370E optical spectrum analyzer on June 26, 2023. An upgraded version of the AQ6370D, it offers enhanced performance and usability features. Ideal for industry, universities, and research, it characterizes various components, including optical communication lasers. Read more...

Press Release
Jun 19, 2023
European Space Agency uses Yokogawa instruments to achieve precise laser tuning for satellites

The European Space Agency (ESA) is using the precision of Yokogawa’s optical wavelength meters to ensure accurate tuning of lasers used in Earth to space communications.

Press Release
Feb 1, 2022
Yokogawa launches high-performance yet affordable 4-wavelength OTDR

Yokogawa has unveiled its AQ1210D dual-purpose OTDR (optical time domain reflectometer) for both single-mode fiber (SMF) and multi-mode fiber (MMF) networks. Part of the AQ1210 series OTDR, the new device meets the demands of small and medium-sized contractors tasked with the installation and maintenance of short-distance networks within and between buildings. 

Press Release
Sep 21, 2020
COVID-19 crisis puts optical fibers to the test
News Brief
May 14, 2020
First Optical Spectrum Analyzer to enable side mode analysis of MWIR lasers

With the new AQ6377, Yokogawa optical spectrum analyzers portfolio now covers the entire wavelength range between 350 and 5500 nm

News Brief
Mar 30, 2020

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