ADVANTEST Q8344A Cross Domain Spectrum Analyzer

ADVANTEST Q8344A Cross Domain Spectrum Analyzer

OVERVIEW

■ Coherence Measurement 

■ High-Speed Measurement with 1.5 Seconds/Sweep 

■ Wide Wavelength Range from 0.35 to 1.75 µm 

■ Wavelength Measurement Accuracy of 0.1 nm

Optical Spectrum Analyzer

Q8344A is an optical spectrum analyzer with a wide wavelength range from 0.35 to 1.75 µm. The usage of a Fourier spectrum system using a Michelson interferometer makes it possible to analyze coherence that cannot be obtained by the dispersing spectrum systems using monochromators. It exhibits its capabilities for evaluation of laser diodes for CDs and video disks. The built-in He-Ne laser used as the reference wavelength realizes a wavelength accuracy of ± 0.1 nm (1.3 µm), ensuring a long-term measurement stability even without wavelength calibration. The Q8344A provides a maximum wavelength resolution of 0.05 nm (at 0.85 µm), accommodating measurements of laser diodes with narrow mode intervals. The measurement speed is approx. 1.5 seconds (at 0.4 to 1.05 µm and 0.8 to 1.75 µm) regardless of the analysis span, allowing it to be used as a system component. With the versatile display, analysis and processing functions, the Q8344A can be used for characteristic measurement applications for diverse components ranging from photoemitting elements such as laser diodes and LEDs to optical components such as optical fibers and filters.

■ Coherence Measurement 

Since the Q8344A uses a Michelson interferometer, it can be used for coherence measurement. This ability allows easy evaluation of performance of the noise suppression caused by the returned light of laser diodes for video disks. The analysis range is approximately ±10 mm, allowing measurement of coherence length of SLDs (super luminescence diodes) used for optical fiber gyros.

■ High-Speed Measurement with 1.5 Seconds/Sweep Well-Suited for Production Use 

The Q8344A employs a Fourier spectrum system and therefore can make measurement in 1.5 seconds regardless of the measurement span and sensitivity (provided that the starting wavelength is 0.4 µm or longer and the measurement does not cover both the short and long wavelengths). Therefore, the analyzer is useful for measurements on laser diodes and LEDs at the production lines. Also for evaluation of the transmission and loss characteristics of optical fibers and filters. When used as a system component, the analyzer requires only 1.5 seconds to perform triggering, measurement and data output; dramatically improving the system throughput. 

■ Wavelength Measurement 

Accuracy of ± 0.1 nm With the built-in He-Ne laser as the reference light source, measurements can be made with a high wavelength accuracy of ± 0.1 nm (at 1.3 µm wavelength). This makes it possible for accurate wavelength measurement without wavelength calibration. 

■ Maximum Wavelength Range of 0.05 nm 

The Q8344A provides a maximum resolution of 0.05 nm at short wavelength (0.85 µm), making it possible to measure CD and visible light laser diodes by fully resolving the oscillation mode one by one. 

■ Large-Caliber Fiber Input (Option) A 200 µm large-caliber input can be used as an option. 

When analyzing a device whose wavelength is larger than the standard fiber caliber (GI 50 µm), this option is needed. For laser diode analysis, the standard 50 µm specifications are recommended and for LED analysis, this optional specification is recommended.

Technical Specifications

Voltage & Current: Specific voltage and current specifications may vary depending on application scenarios and customisation needs, but usually feature multiple voltage and frequency adaptations to suit different regional electrical standards.

Durability and Safety: High-quality power interface boards are typically made of durable materials and equipped with safety devices such as fuses and circuit breakers to ensure long term reliability and stability while protecting the equipment and users.

Communication features: Some power interface boards may have communication interfaces that allow the device to communicate with a computer or other control system for remote monitoring and control.

Indicator Lights and Displays: Some power interface boards may be equipped with indicator lights for displaying information such as power status, connection status, etc., to facilitate troubleshooting and status monitoring by users.