The AQC also achieves high-speed measurement of tunable lasers. Tunable lasers have been widely used as an optical source for large-capacity, long-distance communication in recent years.
During quality inspection, it is crucial to measure how much the side mode of the main signal of the laser is suppressed. In this measurement, the spectrum including the main peak and side mode of the main signal of the laser needs to be measured at the same time. Therefore, it is important to measure with wide dynamic range and at high speed. Optical spectrum analyzers have an auto-range measuring function, which enables the measurement of optical power while automatically changing the gain of an internal amplifier depending on the input light power level.
The AQC achieves high-speed measurement even when in auto-range mode by optimizing the internal time constant when switching the gain and the rotational speed of the diffraction grating. Thus, this function is effective when measuring the side modes of tunable lasers or distributed feedback DFB lasers. Figure 7 shows an example of high-speed measurement of the spectrum of a DFB laser. The side mode of the laser is precisely measured in about 0.
When the light to be measured is input to the optical spectrum analyzer via the optical connector, the optical power level fluctuation when attaching and detaching the optical connector must be suppressed. When connecting an optical fiber, lower insertion loss is desirable for various applications even when connecting a multimode fiber such as GI Thus, Yokogawa uses a free-space structure for the optical input section, which has been highly evaluated by customers.
This free-space structure is also implemented in the AQC by optimizing the layout of optical components. This suppresses the optical power level fluctuation when attaching or detaching an optical connector, and multimode fibers can be connected with little insertion loss. As the number of multiplexed signals increases, the OSNR cannot be accurately measured due to the limitation of the optical dynamic range of the monochromator. This requires choosing the special measurement mode wide dynamic range mode which makes the measuring time substantially longer.
As the AQC has a wide optical dynamic range, it can accurately measure OSNR at high speed in the normal mode even if the number of multiplexed signals increases. With the noise figure NF analysis function, the AQC can measure gain and NF, which are indexes for evaluating an optical fiber amplifier, for each channel at the same time.
In addition, the AQC can graphically display the values of the gain and NF of each channel, thus the differences among gains of each channel gain tilt can be visually verified. If there is a discrepancy between the terms of the OSS license and the terms of this license, the license terms of the corresponding OSS take precedence.
Corresponded to new feature added to AQ firmware version R Added new OS support. Corresponded to updated feature of AQ firmware version R Improved read processing of help data. Added new functions corresponding to AQB firmware version R3. Corresponded to new feature added to AQC firmware version R Added new functions corresponding to AQC firmware version R2. With WDM-NF analysis function, up to channels of multiplexed signals can simultaneously be tested.
The A and A are unique adapters that reduces the numerical aperture NA of a connected fiber to half and is only applicable to the free space optical input structure on the Yokogawa AQ series optical spectrum analyzers. To accurately measure pulsed light using an optical spectrum analyzer OSA , it is necessary to understand the characteristics of the OSA and select the appropriate measurement method and settings.
This is the speed at which the OSA completes a wavelength sweep typically specified for measurement over a nm span. The sweep speed is especially important when performing many repetitive measurements.
To meet the instrument's specifications, set the sweep speed to this value. With the sweep speed set to this value, the instrument can measure light sources ranging from line spectrum such as the DFB-LD to broadband wavelength such as LEDs light sources. Select this value when you are measuring light sources that have comparatively gentle spectrum shape level changes, such as LED light sources. First check the measurement spectrum, and then select this value if appropriate. Laval University is a research institution world renowned for optics and photonics technology research and training, and are the founders of The Center for Optics, Photonics, and Lasers COPL.
The university's researchers needed a faster and more efficient and practical solution to measure the spectral performance of lasers and optics beyond traditional telecom wavelengths.
This new OSA includes many sought-after features including:. Looking for more information on our people, technology and solutions? Request a Quote. Technical Support. Brochures Instruction Manuals Specifications.
Software Firmware. Upcoming Events. High wavelength resolution: 0. Example of the spectral shape Stray-light suppression ratio: 80dB typ. With the sharper spectral characteristics of the monochromator, spectral signals in close proximity can be separated clearly and measured accurately.
Example of the stray-light suppression ratio High dynamic mode: ON, Resolution setting 0. The AQC can measure high power sources such as optical amplifiers and pump lasers for Raman amplifiers, and very weak optical signals as well.
Measurement sensitivity can be chosen from seven categories according to test applications and measurement speed requirements. With an advanced monochromator, faster electrical circuits, and noise reduction techniques, the AQC achieves fast measurement speed even when measuring a steep spectrum from DFB-LD or DWDM signals, or when measuring a low power signal from a broadband light source.
The 50, data sampling points expands measurement range in a single sweep while keeping a high wavelength resolution. This makes your measurement easier and more efficient than conventional systems.
Macro Programming. Ambient condition change, vibration and shock to an optical precision product, like an optical spectrum analyzer, will effect the optical components, and eventually degrade optical performance. Using standard functions, AQC can maintain its high optical performance within a couple of minutes so that you can quickly start a measurement.
AQC's overall high performance can cover not only manufacturing of optical devices and optical transmission systems but also research and development, and a variety of other applications.
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