On February 16, 2016, YOKOGAWA Meters & Instruments officially released the AQ6376 spectrum analyzer. AQ6376 is a desktop spectrum analyzer with large dynamic range and high resolution. It can accurately measure the laser spectrum with a wavelength range of 1.5 ~ 3.4μm. AQ6376 is the industry's first to support 3-μm band based spectroscopic principle * 1. spectrum analyzer.
A spectrum analyzer is an optical measurement device that analyzes the wavelength components of various optical devices such as semiconductor lasers and fiber lasers in order to evaluate their characteristics. 3-μm laser has attracted widespread attention in the field of environmental measurement and medicine. AQ6376 will help improve the measurement efficiency of 3-μm band optical devices and accelerate the application of 3-μm lasers in the above fields.
Development background <br style="line-height: 16px;" /> In recent years, laser absorption spectrum * 2 Began to be widely used in the detection of various gases in the environmental field, such as carbon oxides (COx), nitrogen oxides (NOx) and hydrocarbon gases (CXHY). Although the light source for such applications mainly uses 2-μm semiconductor lasers, as these gases have a stronger absorption of light at longer wavelengths, the industry's demand for 3-μm lasers is also increasing. On the other hand, optical lasers have also gradually been introduced into the medical field, and the demand for analysis of water-containing substances has also led to a surge in demand for 3-μm fiber lasers. Therefore, the demand for analytical instruments capable of accurately measuring a 3-μm band spectrum has also increased.
There are already some devices that can measure the spectrum of light in the 3-μm band, including interferometer-type measuring instruments and large-scale measurement systems using spectrometers. However, they all have the disadvantages of narrow dynamic range and low wavelength resolution, which reduces the measurement accuracy. Therefore, the market urgently needs a high-performance spectral analyzer that can break through the above-mentioned limitations.
Since entering the spectrum analyzer market in 1980, Yokogawa has been committed to developing and improving the spectrum measurement technology in the visible and near-infrared range. With his expertise in the field of spectral analysis, Yokogawa has now developed the AQ6376 spectrum analyzer, enabling measurements in the 3-μm mid-infrared band.
1. Industry-leading measurement range
AQ6376 has 80dB power measurement dynamic range and 55dB adjacent dynamic range * 3 , which are 10,000 times and 300 times higher than the current interferometer-based 3-μm band test instruments, respectively. No other instrument on the market can achieve this dynamic range * 4 The AQ6376 is sufficient for accurate side mode measurement of semiconductor lasers.
2. Industry's highest wavelength resolution
AQ6376 has the industry's highest wavelength resolution of 100pm, which is three times the current interferometer-type instruments used in the 3-μm band * 5
3. Achieve accurate spectrum measurement
The AQ6376 has two additional enhancements. The first is that the water vapor in the spectroscope can be removed to prevent water absorption from affecting the measurement of a specific wavelength of light. At the same time, due to their design principles, all beam splitters have the problem of high-order diffracted light with a wavelength of 2 to 3 times the incident light. Another enhancement of AQ6376 can reduce the effect of high-order diffracted light during the measurement process.
Main target users <br style="line-height: 16px;" /> Universities, research institutes, active and passive optical device manufacturers.
-Measurement of emission spectra using semiconductors, fibers and other broad-spectrum lasers.
-Measurement of wavelength transmission characteristics of optical filters, such as fiber Bragg gratings (FBG) * 6
* 1 A technology that passes a beam of broad-spectrum light through a slit into a diffraction grating to extract a narrow range of wavelength light.
* 2 A molecule is irradiated with a laser, and the molecule absorbs light of a specific wavelength according to its type. This principle is used to analyze spectra and quantitatively evaluate gas composition.
* 3 This indicator is used to measure the ability of the spectrometer to separate weak signals from the stronger signal (wavelength) end.
* 4 Based on YOKOGAWA survey, as of February 2016. Dynamic range is a reference value (typical), not a guaranteed value.
* 5 Based on YOKOGAWA survey, as of February 2016. 100pm is the highest wavelength resolution that can be achieved when measuring in the 3-μm band.
* 6 A device that uses a periodic change in refractive index to reflect a specific wavelength of an optical fiber.
Key feature summary
Long wavelength range: 1500 to 3400 nm
Gas purging ports to reduce water vapor effects
Built-In cut filter for high order diffracted light
Double Speed Mode to further enhance fast measurement speed
High sensitivity down to -65 dBm
High resolution to 0.10 nm
Wide close-in dynamic range (55dB)
Free space optical input for maximum flexibility, low maintenance, and high reliability
Applicable to single-mode and multimode fibers
Excellent performance for environmental gas sensing Laser Spectroscopy
Indispensable tool for R & D and manufacturing of optical devices in the wavelength range from telecom band to 3.4μm
Due to the high resolution and sensitivity of the AQ6376, it can actually detect the presence of water molecules in the air. The water vapor is detected in the upper Near-IR wavelength region and could overlap with or mask the spectral characteristics of the actual device under test in that particular region.
By continuously supplying a pure purge gas such as nitrogen to the monochromator through the ports on the back panel, the AQ6376 can reduce the influence of water vapor absorptions and provide more reliable and accurate measurements than ever before.
Built-in cut filter for high order diffracted light
Due to the diffractive technology used, the monochromator in some circumstances could generate high order diffracted light, which appears at wavelengths equal to the integral multiple of input wavelengths.
By cutting incoming light below 1500 nm with the built-in filter, the AQ6376 drastically reduces the influence of high order diffracted light on the measurement. Thus, the measured data are always reliable and replicate the real signal under test.
Double speed mode
Increases the sweep speed up to 2 times compared to the standard sweep mode, with only a 2 dB penalty to the standard sensitivity value.
Long Wavelength Range: from 1500nm to 3400nm
The AQ6376 covers not only the wavelength span used in communications, but also the 3µm region which is used for environmental sensing, medical, biology and industrial applications.
High Sensitivity: down to -65dBm
The AQ6376 can measure optical power from + 13dBm down to -65dBm thanks to its high-dynamic and very low noise components and circuits used for photo detection. This enables precise measurements of both high power and low power sources.
Measurement sensitivity can be chosen among 7 values according to the measurement speed required by the specific test to be performed.
The spectrum of a white light source (yellow) and the background noise of AQ6376 (purple)
High Resolution & Wide Dynamic Range
The AQ6376 uses a double-pass monochromator structure to achieve high wavelength resolution (0.10 nm) and wide close-in dynamic range (55 dB). Thus, closely allocated signals and noise can be separately measured.
Measured 1550 nm laser, Close-in Dynamic range: @ peak ± 2 nm
High speed Measurement
High Speed Sweep
With a proprietary sweep technique the AQ6376 achieves a much faster sweep speed than conventional measurement systems, which use a monochromator. Max. Sweep time is only 0.5 sec. For 100 nm span.
Fast command processing and data transfer
Applying a fast microprocessor, the AQ6376 achieves very fast command processing speed and Ethernet interface provides up to 100 times faster data transfer speed than GP-IB.
The AQ6376 has a built-in reference light source for wavelength calibration and optical alignment of the monochromator components, allowing it to deliver always-accurate measurements.
The calibration and alignment process takes less on the unit take than 2 minutes and is fully automatic.
NOTE: The wavelength calibration can also be performed by using an external reference source.
Free-Space Optical Input
The AQ6376 uses a free-space optical input structure, ie no fiber is mounted inside the instrument.
This smart solution is:
WORRY-FREE, as no internal fiber can be scratched or get dirty
MAINTENANCE-FREE, as no internal fiber has to be cleaned
VERSATILE, as the instrument accepts both / PC and / APC connectors
DUAL PURPOSE, as the instrument accepts both Single-Mode and Multi-Mode fibers without being affected by the high insertion loss from MM-SM fibers matching
Product attributes [Wavelength range] 1500-3400 nm [Optical resolution] 0.1nm