Optical Measuring Instruments and Optical Device Test Systems

Optical Spectrum Analyzer for Coherent Measurements

■Coherence measurement

■High-speed measurements at 1.5 sec/scan

Wide wavelength range from 0.35 micron to 1.75 micron

■Wavelength measurement accuracy of 0.1 nm

The Q8344A is an optical spectrum analyzer with a wide wavelength range from 0.35 to 1.75 µm.

By using a Fourier spectroscopy system with a Michelson interferometer, it is possible to analyze coherence that cannot be obtained with a dispersive spectroscopy system using a monochromator.

It demonstrates the ability to evaluate laser diodes for optical and video disks.

The Optical Measurement Instruments and Optical Devices Test System has a built-in He-Ne laser used as a reference wavelength with a wavelength accuracy of ± 0.1 nm (1.3 µm), which ensures long-term measurement stability even without wavelength calibration.

With a maximum wavelength resolution of 0.05 nm (0.85 µm), the Q8344A is suitable for measuring laser diodes with narrow mode intervals.

Measurement speeds of about 1.5 seconds (0.4 to 1.05 µm and 0.8 to 1.75 µm) are independent of the analysis span, so it can be used as a system component.

With its versatile display, analysis, and processing capabilities, the Q8344A can be used for a variety of component characterization applications, from light-emitting components such as laser diodes and LEDs to optical components such as optical fibers and filters.

Coherent Measurements

Since the Q8344A uses a Michelson interferometer, it can be used for coherence measurements. This feature makes it easy to evaluate the performance of noise suppression caused by the return light of laser diodes in video disks.

An analysis range of approximately ±10 mm enables measurement of the coherence length of SLDs (Super Light Emitting Diodes) used in fiber optic gyros.