Q8384 Optical Spectrum Analyzer

Optical spectrum analyzer for DWDM applications

ADCMT

NOT distributed in North America & Asia
This is a discontinued product
More Information? Please contact us.

Key Facts

  • Wavelength range 600 to 1700 nm
  • State-of-the-art resolution bandwidth of 10 pm
  • +/-20 pm wavelength accuracy with option 25
  • Sensitivity -87 dBm
Down to Key Facts

Brief Description

Q8384 is a high-grade optical spectrum analyzer (Advantest) with a 4-pass monochromator and extremely low polarization dependance. Thanks to a special method used, a value of ±0.05nbsp]]dB can be guaranteed, the typical value is as low as 0.02 dB.

Features & Benefits

Measurement, Characterization and Compliance Testing in the Design and Manufacturing of:DWDM Transmission Systems DWDM Components Erbium Doped Fiber Amplifiers Narrow-Band Optical Filters like FBG and AWG Laser Diodes

Key Facts

  • Wavelength range 600 to 1700 nm
  • State-of-the-art resolution bandwidth of 10 pm
  • +/-20 pm wavelength accuracy with option 25
  • Sensitivity -87 dBm
  • Polarization dependence ±0.05 dB
  • Accuracy of resolution bandwidth ±2%
  • Various power and spectral widths measurements
  • Multitude of DWDM analysis features
  • Optical amplifier parameter measurements
  • Pulse light measurement
  • Gated measurements for loop testing

Brief Description

Q8384 is a high-grade optical spectrum analyzer (Advantest) with a 4-pass monochromator and extremely low polarization dependance. Thanks to a special method used, a value of ±0.05 dB can be guaranteed, the typical value is as low as 0.02 dB. The narrowest resolution bandwidth and the broad dynamic range make the Q8384 an ideal measuring instrument in the DWDM technology for closest channel spacing. A special measurement function allows the automatic determination of erbium-doped fiber amplifiers (EDFA) parameters; these are e.g. noise figure, gain and spontaneous emission by simple comparison of the signal at the amplifier input with the signal at the amplifier output.

All these features are of course also of great advantage for the measurement of laser diodes, LEDs and other light sources, evaluating their parameters by single push button operation. A curve fitting function directly shows the electroluminescence characteristic by fitting a Gaussian distribution into the emission spectrum. This is a valuable aid in the measurement of erbium- doped fiber amplifiers EDFA's and LDs. Special functions for pulsed light allow measurements of fiber loop transmission systems. Internal or external triggering is possible.

The measurement time is 0.5 second for a span of 10 nm in fast sweep mode and varies as a function of the span and the required dynamic range. The highest sensitivity is attained for wideband sources with a resolution of 5 nm, while narrowband sources (laser) can reliably be analyzed down to the noise level with narrow resolution bandwidths. A normalization function in conjunction with a white light source enables direct measurement of the transmission and loss characteristics of optical filters and fibers and other components.

Other application oriented software offers single push button measurements of various filters and their parameters.

Features & Benefits

  • Measurement, Characterization and Compliance Testing in the Design and Manufacturing of:

    DWDM Transmission Systems DWDM Components Erbium Doped Fiber Amplifiers Narrow-Band Optical Filters like FBG and AWG Laser Diodes

    • Optical Spectrum Analysis of WDM Signals

    The Q8384 is a high-end optical spectrum analyzer (OSA), performance optimized for the DWDM test market. Equipped with a new multi-pass monochromator, the instrument achieves a resolution bandwidth of 10 pm, a wavelength accuracy of ±20 pm and a dynamic range of 50 dB (±0.1 nm) and 60 dB (±0.2 nm), which enable it to discriminate DWDM channels with 50 GHz spacing or closer in the optical spectrum. The superior resolution of 10 pm enables measurements of modulated light signals with highest fidelity.

    • WDM Channel Analysis

    The Q8384 can detect peak wavelengths, power levels and signal-to-noise ratios of up to 256 WDM channels. The display shows wavelength and power level measurements as absolute values or as deviations from reference signals. The wavelength display of the Q8384 can also be switched to show optical frequencies.

    • Amplifier Measurements

    The instrument enables convenient measurements of gain and noise figure of optical amplifiers. When performing these measurements, the optical input signal of the amplifier is measured and stored as a reference. After connecting the amplifier output to the OSA a single button push displays gain and a high-accuracy noise figure measurement with an uncertainty of ±0.23 dB. Since the Q8384 can adequately separate the ASE level of DWDM channels spaced 50 GHz (0.4 nm), it cannot only perform accurate noise factor measurements but also show multiple measurement results at the same time. The curve fitting method for the noise figure measurement is user selectable.

    • Efficient Transmission/Loss Measurements

    In conventional transmission/loss measurements for optical filters, it was necessary to measure an external reference signal in advance and then carry out the intended measurements on the real signal under the same conditions. With the Q8384, the user can use the optionally built-in EE-LED as a reference signal. Once the reference signal is measured in a wide wavelength range, a built-in zoom feature allows the user to make transmission and loss measurements while varying the center wavelength and measurement span freely within the wavelength range of the reference signal.

    • Pulse Measurements

    Performing a long-distance transmission experiment using loop tests requires an optical spectrum analyzer with a sweep function triggered by an external gate signal. The Q8384 supports loop tests with its externally synchronized sweep function, enabling it also to measure pulsed light. The instrument can measure very weak signals with a sensitivity of up to -65 dBm.

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