Skip to main content
  • Investors
  • Partners
  • Blog
  • Contact Us
Back
  • United States
  • 中国
  • 日本
  • Brasil
  • СНГ
  • Deutschland
  • España
  • France
  • United Kingdom
  • Mexico
VIAVI Solutions
Back
  • United States
  • 中国
  • 日本
  • Brasil
  • СНГ
  • Deutschland
  • España
  • France
  • United Kingdom
  • Mexico
Search icon
    • Lab and Manufacturing
      • Lab and Manufacturing
        • AI RAN Scenario Generation
        • Application Emulation
        • Automation and Orchestration
        • UE Emulation
        • Cloud UE Emulation
        • Core Emulation
        • Core Test
        • O-CU Simulator
        • O-CU Test
        • O-DU Test
        • O-RU Test
        • Security Validation
        • Test as a Service (TaaS)
        • Ethernet Test
        • High-Speed Networks
        • Optical Manufacturing Test
      • Compute, Storage, Transport
        • Compute, Storage, Transport
        • PCI Express
        • SAS and SATA
        • Fiber Channel, Ethernet, FCoE, NVMeoF
        • Protocol Analyzers
        • Exercisers and Generators
        • Jammers
    • Network Deployment and Maintenance
      • Network Deployment and Maintenance
        • Antenna Alignment and Monitoring
        • Asset and Data Management
        • Cell Site Installation and Maintenance
        • Cable and Antenna Analyzer
        • Interference Hunting
        • RF Analysis
      • Fiber
        • Fiber
        • Asset and Data Management
        • Attenuators
        • Bit Error Rate
        • Copper, DSL, WiFi and Broadband Test
        • DOCSIS Test
        • Essential Fiber Optic Testers
        • Ethernet Test
        • Fiber Characterization
        • Fiber Identifiers
        • Fiber Inspection and Cleaning
        • Fault Locators
        • Fiber Optic Sensing
        • Fiber Optic Light Sources
      • Fiber (cont.)
        • Fiber (cont.)
        • HFC Test
        • MPO Testing
        • Optical Multimeter
        • Optical Power Meters
        • Optical Spectrum Analyzers (OSA)
        • OTDR Testing
        • PON Testing
        • Remote Fiber Test and Monitoring
        • Virtual Test and Activation
        • AIOps
        • Core Network Assurance
        • Ethernet Assurance
        • RAN Assurance
        • Remote Fiber Test and Monitoring
      • Service Assurance
        • Service Assurance
        • 5G Service Assurance and Analytics
        • AIOps
        • Fiber Service Assurance
        • HFC and Cable Service Assurance
        • Transport Assurance
      • Lab and Manufacturing
        • Lab and Manufacturing
        • Automation and Orchestration
        • Cloud UE Emulation
        • Core Emulation
        • Core Test
        • O-CU Simulator
        • O-CU Test
        • O-DU Test
        • O-RU Test
        • RIC Test
        • Security Validation
        • Asset and Data Management
        • Network APIs
        • Remote Fiber Test and Monitoring
        • Virtual Test and Activation
        • AIOps
        • Ethernet Assurance
        • Remote Fiber Test and Monitoring
    • Railway and Mission-Critical
      • Railway and Mission-Critical
      • Drive Test
      • ERTMS and FRMCS Monitoring
      • Mission Critical Assurance
      • Railway Cybersecurity
      • Performance and Threat Visibility
        • Performance and Threat Visibility
        • End-User Experience
        • Enriched Flow Collection
        • Packet Analysis
        • Packet Capture Collection
        • Packet Meta-Data Collection
      • Test and Certification
        • Test and Certification
        • Bit Error Rate
        • Ethernet Test
        • Fiber Identifiers
        • Fiber Inspection and Cleaning
        • Fiber Optic Sensing
        • MPO Testing
        • Optical Power Meters
    • Land Mobile and Military Radio
      • Land Mobile and Military Radio
      • Communications Service Monitors
      • Land Mobile Radio Test
      • Military Radio Test
      • Modular Instrumentation
      • Software Defined Radio and System Solutions
    • Avionics
      • Avionics
      • ADS-B Compliance
      • Aircraft Fuel Quantity Test Sets and Interfaces
      • Antenna Couplers
      • Distance Measuring Equipment (DME)
      • Fiber Optic Avionics
      • GPS Signal Simulators
      • Military Avionics
      • Modular Instrumentation
      • Navigation and Communication
      • Radio Altimeters (RADALT)
      • Radio Frequency Automatic Test Equipment (RF ATE) Systems
      • Tactical Air Navigation System (TACAN)
      • Traffic Collision Avoidance System (TCAS)
      • Transponder and Interrogator
    • Position, Navigation and Timing
      • Position, Navigation and Timing
      • GNSS Disciplined Oscillators
      • GNSS/GEO/LEO Grandmaster Clocks
      • GNSS/GEO/LEO Receiver Modules
      • GPS Simulator
      • RF Transcoder
      • Resilient GEO/LEO Timing Services
    • Custom Optics and Pigments
      • Custom Optics and Pigments
      • Custom Optics
        • Custom Optics
        • Custom Optical Filters
        • Light Shaping Optics
        • MicroNIR Spectrometers
      • Pigments
        • Pigments
        • Brand Protection
        • ChromaFlair Pigments
        • Security Pigments
        • SpectraFlair Pigments
    • All Products
      • All Products
      • All Products
      • Products by Family
      • Discontinued Products
    • Services
      • Services
      • Instrument Care Plans
      • Refurbished Equipment
      • Repair and Calibration
      • System Maintenance and Contracts
      • Training and Certification
      • VIAVI Automated Lab-as-a-Service for Open RAN (VALOR)
      • Order Services
      • Wireless
        • Wireless
        • 5G Solutions
        • 5G Security
        • 5G Synchronization
        • 6G Forward
        • AIOps
        • Automated Lab-as-a-Service for Open RAN
        • Cell Site Installation
        • Cloud-Based Testing
        • Interference Hunting
        • MU-MIMO Test
        • Network Digital Twin
        • Non-Terrestrial Networks
        • Open RAN
        • Private 5G
        • RAN Intelligence Solutions
      • Wireline
        • Wireline
        • AIOps
        • DWDM
        • Ethernet Service Activation Test
        • Fiber Construction
        • Fiber Monitoring
        • Fiber Network Solutions
        • Fiber Sensing
        • FTTx
        • HFC Network Test
        • MPO Connector Testing
        • Passive Optical Network (PON)
        • Rural Broadband
        • Test Process Automation (TPA)
        • Transport Network Operations
        • Hyperscale
        • Data Center Interconnect
        • MPO Connector Testing
        • Tier 1 (Basic) Fiber Optic Certification
        • Tier 2 (Extended) Fiber Optic Certification
    • Network Equipment Manufacturers
      • Network Equipment Manufacturers
        • 5G Security
        • 5G Network Equipment Manufacturers
        • 6G Forward
        • Analytics Enablement
        • Cloud-Based Testing
        • Non-Terrestrial Networks
        • Open RAN Security Test
        • O-RU Commercialization
        • Private 5G
        • Coherent Optics Testing
        • Field Deployment
        • Scalable Manufacturing
        • Technology and Service Introduction
        • Test and Development
      • AIOps
      • Fiber Sensing
      • Open RAN
      • Private 5G
      • Public Safety
      • Solutions for Operations Managers
      • Test Process Automation (TPA)
      • Threat Forensics and Remediation
        • Open RAN Security Test
        • Open RAN Security and Firewall Test
        • Threat Forensics and Remediation
        • Fiber Sensing
    • Government, Aerospace and Defense
      • Government, Aerospace and Defense
        • Electromagnetic Warfare
        • Field Test
        • Military Aviation Testing
        • Payload & Device Optical Elements
        • Radar
        • Research, Development and Manufacturing
        • Secure and Reliable Communications
        • Spectrum Monitoring and Signal Analysis
        • Field Test
        • Private 5G
        • Public Safety
        • Secure and Reliable Communications
        • General Aviation
    • Enterprise and Data Center
      • Enterprise and Data Center
        • Cloud Monitoring
        • End-User Experience Monitoring
        • Integrations and Partner Ecosystem
        • Network Performance Monitoring
        • Private 5G
        • Unified Communications
        • Integrations and Partner Ecosystem
        • Threat Forensics and Remediation
        • Cloud Workflow Management
        • Data Center Interconnect
        • Ethernet Service Activation Test
        • Fiber and Copper Test and Certification
        • MPO Connector Testing
        • Tier 1 (Basic) Fiber Optic Certification
        • Tier 2 (Extended) Fiber Optic Certification
        • WAN Performance Testing
        • Fiber Monitoring
        • Fiber Sensing
        • Electric Power Operators
        • Fiber Monitoring
        • Fiber Sensing
        • Fiber Monitoring
        • Fiber Sensing
    • Contractors and Integrators
      • Contractors and Integrators
      • Cell Site Installation and Commissioning
      • Data Center Contractor Solutions
      • Fiber and Copper Test and Certification
      • Residential Broadband Services Installation
      • Solutions for Field Technicians
      • Solutions for Installers
      • Solutions for Operations Managers
      • Test Process Automation (TPA)
    • Custom Optics and Pigments
      • Custom Optics and Pigments
      • 3D Sensing
      • Anti-Counterfeiting
      • Automotive
      • Biomedical Applications
      • Consumer Electronics
      • Custom Color Solutions
      • Government and Aerospace
      • Industrial
      • NIR Spectroscopy
      • Spectral Sensing
  • How to Buy
    • Request a Quote
    • Request a Demo
    • Check Order Status
    • Contact Us
    • Equipment Rental
    • Financing Options
    • How to Order Products
    • How to Order Services
    • Locate a Partner
    • Refurbished Equipment
  • Resources
    • Learning Center
      • Learning Center
      • What are Cloud Solutions?
      • What is 5G Energy Consumption?
      • What is 5G Testing?
      • What is a Hyperscale Data Center?
      • What is End-User Experience Monitoring?
      • What is Fiber Construction?
      • What is Fiber Optic Sensing?
      • What is Fiber Testing?
      • What is OTDR Testing?
      • What is Packet Capture?
      • What is PCIe 6.0?
      • What is RF Interference?
      • View All Topics
    • Literature Library
    • Blog Posts
    • Subscription Center
    • Video Library
    • Webinars
    • Customer Support
      • Customer Support
      • Customer Portal
      • Customer Service
      • Technical Support
      • Return Material Authorization (RMA)
      • How-To Videos
      • Knowledge Base
      • Quick Cards and Tech Tips
      • Software Downloads
      • Warranty, Quality and Compliance
    • About Us
      • About Us
      • Awards and Recognition
      • Sustainability
      • Leadership
      • Our Locations
      • Together with VIAVI
    • Careers
      • Careers
      • Career Paths
      • Search and Apply
      • Early-Career Program
      • Life at VIAVI
      • What We Value
      • Events
      • In the News
      • News Releases
      • Blog Posts
      • Subscription Center
    • Partners
      • Partners
      • Locate a Partner
      • Partner Portal Login
      • Compliance
      • Data Privacy and Data Security
      • Patents
      • Product Environmental Compliance
      • Privacy Policy
      • Terms and Conditions
      • Terms of Use
    • Contact Us
Search icon
  1. Home
  2. Resources
  3. Learning Center

What is an Optical Spectrum Analyzer?

  • What is an Optical Spectrum Analyzer?
  • Optical Spectrum Analysis Use Cases
  • How Optical Spectrum Analyzers Work
  • Solutions from VIAVI
  • View Products
  • View Resources
  • Contact an Expert

VIAVI has developed an industry-leading portfolio of optical spectrum analysis test solutions for lab, field, and manufacturing applications. This includes comprehensive test coverage for long haul, access network, and data center interconnect fiber links with high channel counts, strict signal to noise requirements, and coherent technology enabling high speed transmission. Development and production of optical systems and components is supported by compact full-band OSA modules with lab grade performance and resolution.  

An optical spectrum analyzer (OSA) quantifies and displays the power of an optical light source over a given wavelength range. Much like an RF spectrum analyzer, the OSA displays the power in the y (vertical) axis and the wavelength in the x (horizontal) axis. Three key parameters that are measured by an optical spectrum analyzer are the wavelength, power level, and optical signal-to-noise ratio (OSNR).

Nano OSA Modules

A fiber optic communication network utilizing wavelength division multiplexing (WDM) to allow multiple optical carrier signals to be carried over a single fiber is an ideal application for the OSA spectrum analyzer. Long haul networks with inline amplification rely on accurate optical power and OSNR measurements to ensure optimal performance. While some optical spectrum analyzers are tailored to specific wavelength bands (C, L, O-band, etc.), others can operate effectively across multiple bands. Spectrum analyzer optical testing also enables transmissivity and reflectivity testing of optical components at specific wavelengths, and amplifier noise testing.

Fiber optic networks utilize light pulses to convey digital information over thousands of kilometers. High speed data transmission and WDM technology are now part of fiber networks such as CATV HFC/DAA, 5G x-haul, and hyperscale data center interconnects. Test solutions in the field must be capable of wavelength selective measurement to capture the key parameters for individual channels/services. As the accuracy, resolution, and usability of optical spectrum analyzers improves, new opportunities arise for world class product development and efficient production testing of optical systems and components.

Lab and Manufacturing

The optical spectrum analyzer is commonly used in R&D labs worldwide, as next generation laser, LED, WDM, and transponder innovations push the limits of optical technology. As these components are integrated into new systems and manufactured at scale, accurate and reliable production scanning in milliseconds keeps pace with demand.  

  • High-Resolution Spectral Measurement capabilities enable deeper analysis of modulated DWDM transmitters in both lab and manufacturing environments. The VIAVI mHROSA module provides sub-GHz wavelength resolution, in the extended C-band and gives manufacturers visibility into the fine spectral features resulting by single and multi-carrier coherent modulation formats as well as enable modulator tuning and validation of OSNR. 

  • Volume Manufacturing of modules, passive components, lasers, and amplifiers requires a fast and flexible spectrum analyzer working over the entire single mode wavelength range (1250nm to 1655nm). Key measurements like channel power, bandwidth, noise power and OSNR. The VIAVI MAP Wideband OSA (mOSA-C1) delivers unmatched test speed and simplicity in an ultra-compact plug-in module.

Optical Spectrum Analyzer Field Testing<

The complexity of today’s fiber networks would not be sustainable without advanced spectrum analyzer optical solutions. Wavelength and power measurements must be performed throughout the network lifecycle. For high speed fiber networks with inline amplification and reconfigurable optical add-drop multiplexers (ROADM), the optical signal to noise ratio is used to assess performance of an optical network link.  

  • CWDM Testing: Fiber networks utilizing coarse wave division multiplexing (CWDM) with channel spacing at 20nm benefit from compact, full-featured OSA solutions. Analyzer features for access network testing in this category should include wavelength flexibility from 1250nm to 1650nm, ≥18 channel capacity, and a power measurement range typically from -50dBm to +10dBM, occasionally up to +25dBm to support higher power CATV applications. A portable optical channel checker (OCC), which only performs power and wavelength measurements, can also be a viable and economical solution as CWDM links are not amplified (typically) and so do not require OSNR testing.  
  • DWDM System Testing: Once limited to long haul (>100km) deployments, dense wave division multiplexing (DWDM) with channel spacing below 0.8 or 0.4nm and utilizing the C-band is now being used for access networks and data centers. ROADM technology makes OSNR measurement essential for installation, optimization, and maintenance of network links and service performance.  

    xWDM Channels
  • Line Side 100G Testing: 100G networks with inline ROADM present unique challenges for spectral testing. Although the installation, maintenance, and troubleshooting processes are like legacy 10G networks, new coherent modulation formats have introduced new challenges. An advanced optical spectrum analyzer (OSCA-710)  capable of measuring wavelength, power, and in-band/in-service OSNR, by utilizing a spectral correlation technique, for each DWDM channel from an amplifier test access point is recommended to characterize coherent 100G  networks accurately without disrupting services to customers. 

    Modified in-band vs out-of-band OSNR

To apply the spectrum analysis principles originally developed for radio to light waves, it is important to consider the behavior of light as a closely related form of electromagnetic radiation. An Optical Spectrum Analyzer must be able to select a specific wavelength for measurement, then a photodetector can be used to convert light energy into measurable electrical energy (power). There are different technologies that can be used to select individual wavelengths for measurement. 

  • Diffraction Grating (Monochromator) 
    To determine the power for an individual wavelength, the diffraction grating method uses a rotating filter or “grating” inside the optical spectrum analyzer. As the grating in the monochromator moves different wavelengths are presented to the photodetector sequentially as the grating rotates. This method is known for accommodating a wide spectral range and producing accurate readings. The sensitive moving parts in this type of device make it important to protect the OSA from drops or other types of shock.
  • Fabry-Perot Method 
    The Fabry-Perot interferometer method filters incoming light using parallel mirrors to create a resonant cavity. To set the input wavelength, the spacing between the mirrors is tuned using piezo elements. The resolution of the Fabry-Perot optical spectrum analyzer is determined by the precision of this mirror spacing function. This method provides high wavelength measurement accuracy, although the dynamic range is limited. With no moving parts and the ability to detect closely spaced channels, Fabry-Perot lends itself well to DWDM monitoring and measurement applications in the lab or field. 

OCV/OSA-4100

The versatile family of VIAVI Nano OSA modules includes the high resolution full bandwidth OSA-4100 optical spectrum analyser and the OCV-4100 optical channel verifier modules. As CWDM and DWDM are adopted in access networks for broadband services and MWDM or LWDM are explored for use in 5G networks, these compact modules speed up installation, deployment, and maintenance tasks by bridging the gap between precision and portability. The modules include a SPF/SFP+ bay for tuning and verifying pluggable optics in the field and can be coupled with other VIAVI mainframes to provide single solutions for optical spectrum analysis coupled with high-speed service activation, 5G wireless, BERT and OTDR testing. 

OSA-110M/H

With full wavelength range superior optical resolution, and channel spacing resolution to 33GHz, the high performance OSA-110M and OSA-110H modules meet the stringent optical test requirements of long haul or access networks deploying DWDM. The OSA-110H also accommodates high power levels of up to +25dbM for CATV test applications. Compatible with the T-BERD/MTS-6000A and T-BERD/MTS-8000 platforms, the OSA-100 series provides future-proof signal analysis for 40/100G testing and new modulation formats. 

OSA-500/M/R/RS

The unique test requirements of high speed DWDM systems are addressed by the ultra-high optical resolution bandwidth, full wavelength range, and channel spacing capabilities down to 25GHz of the VIAVI OSA-500 series. The OSA-500RS features in-band OSNR to support efficient in-service measurement of ROADM based systems. A built-in physical constant wavelength reference eliminates the need for external recalibration for the lifetime of the device. 

Optical Channel Checkers (OCC)

A handheld optical channel checker is a compact, simple, and low-cost option for installation, maintenance, and troubleshooting of xWDM links which do not require OSNR measurements. Typically, they offer the basic bar graph display to show channel presence and power. The SmartClass OCC-55 channel checker measures up to 18 channels for reliable CWDM characterization, while the SmartClass OCC-56 is dedicated to DWDM analysis. The more advanced COSA-4055 (for CWDM) and OCC-4056C (for DWDM) channel checker modules provide more capabilities that include a spectral trace, wavelength offset and power drift measurement, plus a SFP/SFP+ bay to tune and verify pluggable optics. Both intuitively support the installation and maintenance of metro/access, fiber deep, and 5G DWDM applications. 

Lab and Manufacturing

Optical spectrum analyzer modules from VIAVI for manufacturing and development are designed to address unique customer requirements for test applications, optical precision, and speed. As part of the versatile Multiple Application Platform (MAP) for scalable and configurable optical testing, the ultra-compact, high-resolution mHROSA module and high speed mOSA-C1 module bring unsurpassed simplicity and versatility to emerging optical test and manufacturing environments.   

Corporate
  • About Us
  • Careers
  • Investor Relations
  • News Releases
  • Partners
  • Social Responsibility
Areas of Expertise
  • 3D Sensing
  • 5G Testing
  • Avionics
  • Fiber
  • Service Assurance
Support
  • Customer Service
  • Technical Assistance
  • Technical Support Portal
  • Repair and Calibration
  • Software Downloads
How to Buy
  • Request a Quote
  • Contact Sales
  • Locate a Partner
  • Order Status
viavi logo
  • Facebook
  • Instagram
  • LinkedIn
  • Twitter
  • YouTube
Subscription Center

© 2025 VIAVI Solutions Inc.

  • Cookie Preferences
  • Contact Us
  • Sitemap
  • Terms of Use
  • Privacy Policy
  • Technical Assistance
  • Request RMA
  • Request a Quote
  • Locate a Partner
  • Customer Portal
  • Contact Us