● The Advantest Q8347 is an optical spectrum analyzer employing a Michelson interferometer

 

● High resolution wavelength measurement of 0.01nm at 1.5μm band and 0.001nm at 0.5μm band

 

● Coherent length can be measured

 The coherent length, which cannot be measured by dispersion spectroscopy using a grading based spectrum analyzer, can be measured by Q8347 using the Michelson interference method.  Therefore, the Q8347 can easily determine the noise suppression performance of the CD/VD laser diode due to the reflected light. The analysis range is as wide as +/-165mm.

 

● High-speed measurement

As the analyzer employs Fourier spectroscopy using Michelson interferometer, high speed measurement is realized.

 

● +/-0.01nm wavelength measurement accuracy

As a He-Ne laser is used as internal reference light source, a high wavelength accuracy of 0.01nm is realized. Wavelength calibration is not required.

 

● Easy operation

Various aspects have been taken into consideration to make measurement easier. The panel key arrangement, Soft-key menus and basic key function can be specified in the first hierarchy.  The Q8347 has a built-in level meter which greatly facilitates adjustment of the measurement light coupling.

 

● Zoom function

The measurement data can be analyzed again and displayed with the zoom function.  Data can be displayed from wide to narrow span without repeating measurement.

 

● Various processing functions

They include four types of FWHM measurement function, an automatic peak search function, four types of cursor indication modes, a peak value sting function and 16 data memory areas.

 

● Built-in high-speed printer

 Measurement data can be easily output using a high-speed thermal printer having a printing speed of less than 8 seconds.

 

Specification

 

Wavelength         350nm - 1750 nm  

 

Resolution           0.001nm / 500nm (high resolution mode)

                            0.003nm / 850nm (high resolution mode)

                            0.01nm / 1550nm (high resolution mode)

                                   0.05 nm / 850nm (normal resolution mode)

                                   0.1 nm / 1550nm (normal resolution mode)

 

Wavelength Accuracy    ±0.01 nm or less (high resolution mode)

                                        ±0.1 nm or less  (normal resolution mode)

 

Span                  0.01nm /DIV to 140nm/DIV

 

Input Sensitivity    -72 dBm to +10 dBm  (1.2 μm to 1.6 μm)

                                      -65 dBm to +10 dBm  (0.7 μm to 1.6 μm)

                                      -52 dBm to +10 dBm  (0.45 μm to 1.7 μm)

                                      -42 dBm to +10 dBm  (0.35 μm to 1.7 μm)

 

Level accuracy        ±1.0dB (780nm), ± 0.7dB (1310,1550 nm)

 

Dynamic range       35dB or more

 

Repeatability including polarization dependence ±0.1dB or less at 1550nm

 

Level scale                0.2,  0.5,  1.0,  2.0,  5.0,  10.0 dB/DIV and linear

 

Measurement time         1 second or less

 

Memory function      16 screens ( measurement data) with battery backup

                                           10 screens (measurement condition) with battery backup

                                           Floppy disk (MS-DOS format: 720KB / 1.2 MB)

 

Display             Frequency, superimpose, 3-dimensional trend monitor (power,

                               Wavelength), dual screen (up/down) display, cursor function,

                               Color display customization, Listing

 

Calculation Analysis  ●Spectrum analysis ●Coherence analysis ●Spectral half-width

                                             Calculation ●Averaging ●Automatic optimum measurement

                                             ●Smoothing ●Automatic peak search ●Normalizing ● Curve

                                             Fit ● MAX/MIN hold

 

Optical Input connector    FC connector

 

Data Output      ●GPIB Standard equipment ● direct plotter ● Built-in printer\

 

External Dimensions   Main unit:  424(W) X 221(H) X 500(D)  mm

                                              Optical unit: 424 (W) X 132(H) X 500(D) mm

 

Mass                   Main unit: about 16 Kg

                                   Optical unit about 20 Kg