Category: Advantest

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.

Measurement items

– Channel power measurement

– OBW measurement

– ACP (Spectrum Mask) Measurement

– Spurious emission (in-band) measurement

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

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.

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.

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.

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.

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.

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 dBmThe 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.

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.

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.

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.

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 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.