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At 8.5 kg, the U3661 is the world’s lightest microwave spectrum analyzer, meeting the diverse needs of a wide range of communication systems.

The U3661 not only enhances the basic performance of a spectrum analyzer, but also includes many standard features such as power calculation and high-speed scanning.

The U3661’s compact, lightweight design and three-way power supply system, including batteries, make it the perfect analyzer for field measurements.

The unit also has a built-in RC232 interface for connection to a personal computer, facilitating flexible data management using standard memory cards.

Excellent basic performance and measurement applications

Wideband scanning

The U3661 can continuously scan a frequency bandwidth from 9 kHz to 26.5 GHz on a www.ge-drive.com single screen. Harmonic measurements or spurious signal measurements over a wide bandwidth can be easily compared relative to the fundamental.

Outstanding signal purity

The U3661’s local oscillator is equipped with a precision synthesizer that achieves a signal purity of -100 dBc/Hz (at frequencies ≤3.2 GHz and an offset frequency of 10 kHz). It meets a variety of needs, from adjacent channel leakage power measurements at radio facilities to microwave equipment evaluation.

Occupied frequency bandwidth

The U3661 calculates the bandwidth for a specified power ratio based on the measured spectrum data and then displays it with a marker. In addition, it displays the occupied frequency bandwidth (OBW) and carrier frequency (FC).

Adjacent Channel Leakage Power

The U3661 obtains the total power from the measurement data on the screen. It then integrates the power over the specified bandwidth (BS) to obtain its ratio to the total power.

ACP POINT and ACP GRAPH measurement methods can be selected.

Various Measurement Applications Power Measurement Functions

Average power

Digital mobile communication systems use modulation patterns that can handle signals with large amplitude variations.

Therefore, we have included an average power calculation function that allows power measurement of signals with amplitude variations.

Total Power

For spread spectrum signals used in CDMA or wireless LANs, the total power measurement function is essential. This function consists of two modes: a channel mode for measuring the in-band power specified in the measurement window, and a total power mode for measuring the total power over the entire measurement span.

1 Hz resolution frequency counter

Simply by adjusting the counter markers according to the spectrum, the U3661 can display a frequency counter with a minimum resolution of 1 Hz. This feature is very useful in multicarrier frequency measurements such as mobile radio or CATV systems, where it is difficult to do so with conventional frequency counters.

Multiple Markers

Up to six markers can be set up on a single screen, and a corresponding marker can be assigned to any frequency. The multi-tag function automatically detects peaks and displays a list of frequencies sorted by level or frequency.

The U3661 allows channels to be set for communication systems in major countries.

Most communication systems utilize the FDMA (Frequency Division Multiple Access) method. When observing signals with the U3661. each carrier band to be measured can be registered in the built-in table as a user channel. This makes it possible to call the center frequency by the channel number, thus improving efficiency.

Channel numbers from 1 to 99 can be registered, and two tables are provided. For TV broadcast waves, frequencies can be preset according to the VHF, UHF, CATV BS and CS band names of major countries.

If the CMDA option (OPT 60) is added to the U3661. the CDMA transmission characteristics specified in the IS-95 and J-STD-008 standards can be measured in a single operation.

Functional Features

– Automatic internal setting of CDMA parameters

– Frequency adjustment settings by channel number

– High-stability CDMA channel power measurement function

– High-sensitivity power measurement with built-in preamplifier

Measurement items

– Channel power measurement

– OBW measurement

– ACP (Spectrum Mask) Measurement

– Spurious emission (in-band) measurement

High Accuracy, High Sensitivity, High Speed

Optical power meter

Various optical sensors and light sources are available High accuracy :

± 2.5% (at calibration point)

± 4.5% (over the entire wavelength range)

Linearity : ± 0.5%

Low polarization dependence: 0.003 dBp-p

High sensitivity: -94 dBm

High power input level: +27 dBm

High-speed measurement: sampling rate of 100 times/second

Flexibility to meet the diverse needs of users for optical power measurement

Features

Flexible combination – dual-channel plug-in system.

The Q8221 utilizes a dual-channel plug-in system. Various types of optical sensors and light www.ge-drive.com sources are available as plug-in units. Both channels can be used independently or simultaneously. By using the desired combination of optical sensors and light sources, the Q8221 can handle a wide variety of applications.

High measurement accuracy.

Ensure accuracy over the entire power and wavelength range.

The Q8221’s optical sensors ensure a high accuracy of ±2.5% at the calibration point (short-wavelength sensors: Q82214 calibrated at 780nm; long-wavelength sensors: Q82208. Q82215. and Q82216 calibrated at 1300nm; Q82227 and Q82232 calibrated at 1550nm). In the broadband wavelength region, they ensure ±4.5% accuracy by compensating for the sensitivity curve at each sensor wavelength. In the broadband wavelength region, they ensure ±4.5% accuracy by compensating the sensitivity curve at each sensor wavelength. In addition, a linearity of ±0.5% is ensured. Not only in the calibration point, but also in the broadband wavelength region and at the level to be measured.

High Sensitivity Sensors

Noise level: -94 dBm.

The Q82208 and Q82232 optical sensors achieve high sensitivity by cooling the InGaAs photodiode. the Q82208. in particular, achieves -94 dBm. all three types are capable of measuring high power up to +10 dBm with high linearity. These sensors meet a wide range of user requirements for polarization correlation, return loss, and sensor type. They meet a wide range of measurement requirements.

High Power Input Optical Sensors (Q82227)

Maximum input power: +27 dBm

The Q82227 is suitable for long wavelength, high sensitivity and high power light. The sensor is capable of measuring optical inputs up to +27 dBm. Therefore, it is suitable for measuring the output of fiber-optic amplifiers, pump sources for fiber-optic amplifiers, and high-output devices (e.g., LDs for optical CATV). In addition, the Q82227 has a noise level of -80 dBm, so it can be used for measurements requiring a wide dynamic range.

Low polarization-dependent optical sensor (Q82232): 0.003 dBp-p or lower

The high-sensitivity Q82232 optical sensor has a polarization dependence as low as 0.003 dBp-p. Used in conjunction with the Q8163 polarization scrambler, it can be used for high-speed, high-precision PDL measurements of optical devices.

Low Reflection, High Return Loss Sensors

Adapters with Minimal Reflection

If the input light is reflected back, the effect on the system can lead to inaccurate measurements. the Q82208 optical sensors use optical fibers with beveled polished ends to suppress reflections (return loss of 50 dB or more). the Q82208 is designed for use in optical devices with high speed and high accuracy PDL measurements. the Q82208 is designed for use in optical devices with high speed and high accuracy. When using PC-polished connectors, 45 dB or more return loss can be obtained by using a low-loss, high-return-loss adapter (typical return loss without this adapter is 14 dB). The sensor is suitable for fibers with core diameters of 10 μm and NA values of 0.19 or less, making it suitable for measuring dispersion-shifted fibers. FC, SC, ST, MU, LC, and plug-in connectors are available.

Options available.

High-resolution measurement.

Displays 0.001 dB/0.0001 dB GPIB output.

Absolute power measurements (dBm) and relative power measurements (dBr) are displayed with 0.001 dB resolution.

During GPIB output, the data output resolution is 0.0001 dB.

High-speed, high-throughput measurements.

Up to 100 measurements/second

For all sensors, the Q8221 has a sampling rate of 100 times per second and a ranging rate (time required to move to different ranges) of up to 500 ms (20 ms minimum). In addition, the ability to transmit GPIB outputs at a high speed of 100 times per second dramatically increases the throughput of the production line.

Recording Functions, PDL Measurement Functions

The Q8221’s A and B channels can independently store data containing 400 points. In addition, the stored data can be output directly to an external plotter in the form of a graph. In addition, the Q8221 displays the maximum value, minimum value, and the difference between the maximum and minimum values of the measured data, making PDL measurements with the Q8221 very simple.

Evaluating Optical Narrow Bandpass Filters for Wavelength Division Multiplexing

– High resolution: 0.01 nm (at 1.55 µm) 0.001 nm (at 0.5 µm)

1 GHz (in optical frequency mode)

– High wavelength accuracy: ±0.01 nm

– Measurement speed: 1 to 3.5 seconds

– Coherence analysis range: ±165 mm

ADVANTEST’s own interferometer type

Wavelength resolution of 0.01 nm, wavelength accuracy of ±0.01 nm in the www.ge-drive.com 1550 nm band (resolution of 1 GHz, accuracy of ±1 GHz in optical frequency mode)

The Q8347 spectrum analyzer enhances the performance of spectrum analyzers using Fourier Spectrum Systems and Michelson interferometers.

The Q8347 has a wavelength resolution of 0.01 nm in the 1550 nm spectral band and a wavelength accuracy of ±0.01 nm (1 GHz resolution and ±1 GHz accuracy in optical frequency mode).

In addition, the Q8347 accurately measures each wavelength of an optical wavelength-division-multiplexing (WDM) transmission signal by separating the spectra.

It is particularly useful for evaluating the characteristics of optical narrow bandpass filters used for WDM, such as AWGs and fiber gratings.

In addition, the Q8347 can be used to analyze chirped signals for LD and Soliton transmission.

500 nm band resolution of 0.001 nm Higher resolution can be achieved at shorter wavelengths.

With a resolution of 0.001 nm in the 500 nm band, the Q8347 is best suited for analyzing blue LDs.

Trend Monitoring Function

Input power and wavelength can be displayed as a digital readout, as well as a time-domain trend graph.

Printer and floppy disk drive are standard The system is equipped with a high-speed thermal printer capable of reproducing the display in less than 8 seconds.

In addition, the system is equipped with a floppy disk drive using MS-DOS for easy data storage and analysis.

In addition, data is stored in text format for easy analysis and processing on a personal computer. In addition, the stored data can be subsequently scaled.

Displayable optical frequency

In addition to the normal wavelength display mode, the measurement spectrum can also display the optical frequency.

Since light in terahertz units can be read directly, this is useful for measuring optical wavelength division multiplexing and chirping from LDs, as well as for analyzing Soliton transmission systems.

Coherence analysis of ±165 mm

Because the Q8347 uses a Michelson interferometer, the system is capable of performing coherence analysis.

This feature makes it easy to evaluate the noise rejection performance of a disc LD. In addition, the travel of the interferometer can be greatly increased to allow analysis over a range of ±165 mm.

As a result, more detailed analysis can be performed in addition to the conventional secondary maximum peak (α value).

Curve fitting function

The Q8347 offers sech2 and Gaussian function curve fitting. Therefore, it can be used for spectral analysis of soliton transmission systems.

List display

The peaks of spectrum or coherence data can be displayed as digital data containing up to 200 points.

The separation and level of each channel of an optical WDM transmission system can be seen at a glance.

Optical Measuring Instruments and Optical Device Test Systems

Significant progress has been made in the research and development of ultra-high-speed optical communications and high-density wavelength-division-multiplexed optical communications (Dense-WDM), and these technologies are increasingly being used in industry.

In the field of research and development, amplitude characteristics, chromatic dispersion characteristics, and group division multiplexing characteristics are of utmost importance,

In the R&D field, amplitude characteristics, chromatic dispersion characteristics and group delay characteristics of optical devices or optical subsystems need to be measured with high optical frequency resolution.

Devices that require this feature include AWGs, fiber grating filters, and dispersion compensators.

In particular, since dispersion characteristics can hinder the improvement of optical communication bit rates, dispersion values must be reduced or managed.

The Q7750 optocope (optical network analyzer) is a revolutionary device for measuring optical transmission characteristics.

It can measure the amplitude/dispersion/group delay characteristics of incident and reflected light from optical devices at high speed and high resolution over the optical carrier frequency range.

In addition, it can easily measure various chromatic dispersion characteristics, www.ge-drive.com including the zero-dispersion characteristics and dispersion slope characteristics of dispersion-shifted or non-zero-dispersion fibers.

Measurement using the phase-shift method enables high optical frequency resolution and wide dynamic range.

Batch Measurement of Optical Transmission Characteristics in the Optical Carrier Frequency Range The Q7750 is equipped with a variable wavelength light source.

The Q7750 is equipped with a variable wavelength light source that enables simultaneous measurement of transmission and reflection characteristics in the optical carrier frequency range by scanning a series of wavelengths (optical frequencies) (S21 and S11 as S-parameters).

The measurement parameters are shown in the table below. These parameters can be measured simultaneously in a single scan.

High optical frequency resolution

Optical frequency resolution: up to 50 MHz (converted to 0.4 pm according to wavelength)

The Q7750 has a maximum optical frequency resolution of 50 MHz, which enables measurements in the field of ultra-high-resolution optical carrier frequencies that were not previously possible.

Amplitude and chromatic dispersion characteristics of optical devices for DenseWDM or Ultra-Dense-WDM can be easily measured (channel steps: 100 GHz, 50 GHz, 25 GHz, etc.).

Selectable wavelength spans from 70 nm (maximum) to approximately 0.1 nm (minimum).

High-speed measurement

Measurement time Approx. 6.7 ms (per measurement point) Approx. 4 seconds (within the specified span) The interval between scans (measurement time) is approx. 4 seconds.

This means that the Q7750 can complete a measurement in 4 seconds, whereas the previous measurement process took several tens of seconds.

If the measurement time is too long, accurate results may not be obtained because the characteristics of the device under test may change due to environmental conditions such as temperature.

The Q7750 completes measurements in a short period of time, ensuring high-speed, accurate measurements that are unaffected by the temperature characteristics of the device under test.

550 to 1750 nm

Optical Spectrum Analyzer

Low polarization dependence

For optical amplifiers

Brief Description

The Q8383 is an advanced spectrum analyzer (Advantest) with a two-pass monochromator and very low polarization dependence.

Thanks to a special method, values of ±0.05 dB are guaranteed, with typical values as low as 0.02 dB.

Together with the high accuracy of the resolution bandwidth, the Q8383 can be used to perform precise power measurements.

All of these features make the Q8383 an ideal measurement instrument for erbium-doped fiber amplifiers (EDFAs).

By simply comparing the signal at the input of the amplifier with the signal at the output of the amplifier, special measurement functions can be used to determine the noise figure, gain and spontaneous emission.

Of course, all these functions are also of great advantage when measuring laser diodes, light emitting diodes and other light sources.

The curve fitting function directly displays electroluminescence characteristics by fitting a www.ge-drive.com Gaussian distribution to the emission spectrum.

This is very useful for measuring Erbium Doped Fiber Amplifiers (EDFA) and Light Emitting Diodes. A special feature for pulsed light allows measurements of fiber optic rings and soliton transport systems. Internal or external triggering is possible.

Measurement time is 0.8 seconds for a span of 200 nm and varies with the span.

Broadband light sources with a resolution of 5 nm have the highest sensitivity, while narrowband light sources (lasers) can be reliably analyzed down to the noise level even with a narrow resolution bandwidth.

The normalization function combined with the white light source allows direct measurement of transmission and loss characteristics of filters and fibers.

Key Features

– Sensitivity -92 dBm

– Polarization correlation ±0.05 dB

– Resolution bandwidth accuracy ±2

– Power Measurement

– Pulsed light measurement

Operation

In addition to amplifier analysis, a variety of display modes are available, such as

– Overlay display,

– Comparison with memory contents,

– Display of two independent graphs (split screen),

– Power meter function,

– Use of multiple markers,

– Normalized and direct readout of transmission loss and

– Automatic bandwidth analysis (e.g. measurement of half-value widths based on RMS and envelope methods),

– Curve fitting over the IEC/IEEE bus and many other features facilitate operation of the analyzer and simplify analysis.

A standard internal disk drive is used as a storage medium. Stored binary data can be analyzed with the appropriate program under MS-Windows or copied to a file and printed out.

The high-speed built-in thermal printer prints out a hard copy of the measurement results with all setup parameters in less than 10 seconds. The built-in high-speed thermal printer prints a hard copy of the measurement results with all setup parameters in less than 8 seconds.