ADVANTEST Q8381A Optical Spectrum Analyzer

ADVANTEST Q8381A Optical Spectrum Analyzer

Related information

■ Wide Wavelength Range: 0.35 to 1.75 µm 

■ Low Polarization Dependence: ± 0.1 dB or less 

■ High Input Sensitivity: -85 dB 

■ Unique Pulse Light Measurement Function 

■ Power Monitoring Function 

■ Versatile Memory Function

Optical Spectrum Analyzer

Q8381A optical spectrum analyzer can analyze a wide wavelength band from 350 to 1750 nm and a wide dynamic range from -85 to +10 dBm (1.1 to 1.6 µm), accommodating measurements on display LEDs and optical devices for communication. In addition, ADVANTEST’s unique technology realizes low polarization dependence and a high level measurement accuracy of ± 1.5 dB. In addition to the automatic optimum measurement condition setting, automatic peak search and half-value width measurement functions, the Q8381A mounts the pulse light measuring function, power monitoring function and luminosity compensation display functions for improvement of operation and analysis capabilities. In conventional pulse light measurement, even if a number of averagings is made and the average power of duty ratio is obtained; low level and data missing may result. The Q8381A has solved all these problems.

■ Wide Wavelength Measurement with High Sensitivity 

The Q8381A can measure a wide wavelength range from 1.1 to 1.6 µm at a high sensitivity of -85 dBm. Therefore, level measurement for spontaneous emission light from an erbium doped fiber amplifier (EDFA) and wavelength characteristic measurement in combination with white light source can be performed over a wide dynamic range. 

■ Wide Dynamic Range Measurement 

By minimizing the ambient light level, the Q8381A achieves a wide dynamic range of 40 dB at 1 nm and 50 dB at 5 nm from the peak wavelength. This level of performance is ideal for measurement on the side-mode suppression ratio of DFB laser diodes

■ High-Speed Measurement 

The Q8381A can achieve high-speed measurement in 0.8 seconds or less (with a span of 200 nm) in the NORMAL mode, allowing spectrum variation to be measured securely. In adjustment of the filters center wavelength, it can make measurement in real-time manner by means of inter-marker sweep. 

■ Low Polarization Dependence Ensures 

High-Accuracy Level Measurements 

With ADVANTEST’s u n iqu e tech n ology, th e Q8381A can achieve a level measurement accuracy of ± 1.5 dB, ensured by a polarization dependence as low as ± 0.1 dB over all wavelength bands. The wavelength sensitivity characteristic is also compensated in all the wavelength bands, enabling more accurate level measurements. 

■ Accurate Pulse Light Measurement 

To date, the spectrum of a pulse-modulated optical signal was measured after averaging. However, the measured spectrum may be lower than the actual light-emitting level or d ata missing may occur. To solve this problem, the Q8381A provides two measurement modes: PULSE sweep mode and GATED MEAS mode. 

■ Power Monitoring Function 

When analyzing beam light using an optical spectrum analyzer, coupling to optical fiber is required. With the conventional method, the beam light is fed to the analyzer while monitoring th e cou p lin g con d ition u sin g an op tical p ow er m eter. The Q8381A’s p ow er m on itor fu n ction can be u sed in th e same manner as the optical power meter.

Application Areas

Electric power plants: monitoring and controlling generators, steam turbines, governors and other equipment to ensure the stable operation of the power generation system.

Power transformer and distribution: used in substations and distribution stations to monitor and control transformers, circuit breakers, voltage regulators and other equipment.

Power grid control: applied in monitoring, scheduling and control of power systems to ensure the stability and reliability of power networks.

Industrial process control: in manufacturing and chemical plants for automating and monitoring production processes.

Energy Management System: supports the monitoring, analysis and optimisation of energy systems to improve energy efficiency.

Power Generation Scheduling: Coordinates and optimises the operation of power generation plants to meet electricity demand.

Smart Grid: in smart grids to support the digitisation and intelligence of power grids.