Keysight (Agilent) N4391A REPAIR and Keysight (Agilent) N4391A CALIBRATION

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   Keysight (Agilent) N4391A   Description / Specification:    
Keysight (Agilent) N4391A Optical Modulation Analyzer

The Keysight N4391A Optical Modulation Analyzer offers most sophisticated signal processing algorithms with highest flexibility. The analysis software is based on the industry standard Keysight Vector Signal Analysis (VSA) software with extensions for the optical requirements like dual polarization data processing. This analysis software is the work horse in RF and mobile engineering labs and offers all tools needed to analyze complex modulated (or vector modulated) optical signals. It provides a number of parameters that qualifies the signal integrity of your measured signal. The most common one is the normalized geometric error of the Error Vector Magnitude (EVM) of up to 4096 symbols.
Specifications.

Optical modulation analyzer.
Maximum detectable baud rate: Up to 62 Gbaud.
Sample rate: 4 x 80 Gs/s.
Number of polarization alignment algorithms: 6.

Digital demodulation uncertainty.
Error vector magnitude noise floor: 1.8 %rms.
Amplitude error: 1.1 %rms.
Phase error: 0.9°.
Quadrature error: 0.05°.
Gain imbalance between I and Q: < 0.007 dB.
Image suppression: > 35 dB.
S/N: > 60 dB.
Sensitivity: -20 dBm.

Optical DUT input.
Optical input wavelength range: 1528 nm to 1630 nm.
Maximum input power: +14 dBm.
Maximum input power, damage level: +20 dBm.
Receiver polarization extinction ratio: > 40 dB.
Average input power monitor accuracy: ± 0.5 dB.

Optical local oscillator output.
Optical CW output power: > +14 dBm.
Wavelength range: 1528 nm to 1630 nm.

External local oscillator input.
Optical input wavelength range: 1528 nm to 1630 nm.
External local oscillator input power range: 0 dBm to +14 dBm.
Maximum input peak power (damage level): +20 dBm.
Small signal gain, external laser input to local oscillator output (-20 dBm LO input power): 28 dB @ 1550 nm.
Saturation output power @ -3 dB compression: 15 dBm.

Data acquisition.
Sample rate: Up to 80 GSa/s on each channel.
Data acquisition bandwidth: 20/25/33 GHz upgradable.
Jitter between channels: typ 700 fs.
Noise: 0.6 mV rms @ 10 mV range, 32 GHz bw.
ADC resolution: 8 bit/16 bit (interpolated).
Sample memory per channel: Up to 2 Gs/channel.

Options.
-110, Optical modulation analyzer with 4 channel receiver and analysis software.
-210, Internal local oscillator.
-220, Internal local oscillator and external local oscillator input and local oscillator output.
-500, C band iTLA internal local oscillator.
-501, L band iTLA internal local oscillator.
-510, Fast tunable C & L band local oscillator.



 



Related Optical Terms and Definitions. For a complete list go to our  Terms and Definitions Page.

Bandwidth
Bandwidth is the difference between the upper and lower frequencies in a contiguous set of frequencies within which a fiber optic component, link or network will operate.

Extinction Ratio (ER)
Extinction Ratio is the ratio of two optical power levels, of a digital signal generated by an optical source, (example a laser diode), where P1 is the optical power level generated when the light source is "on," and P0 is the power level generated when the light source is "off." The extinction ratio may be expressed as a fraction, in dB, or as a percentage.

Optical Signal-to-noise Ratio (OSNR)
Optical Signal-to-noise ratio is the ratio between the signal power and the noise power in a given bandwidth. Most commonly a reference bandwidth of 0.1 nm is used. This bandwidth is independent from the modulation format, the frequency and the receiver. For instance a OSNR of 20dB/0.1nm could be given, even the signal of 40 GBit DPSK would not fit in this bandwidth. OSNR is measured with a Optical Spectrum Analyzer. It is generally measured at the wavelength of interest.

Repeatability
Repeatability is the variation in a number of repeated measured quantities when measurement conditions are changed and restored. The value corresponds to half the spread between the minimum and maximum value measured.

Wavelength Repeatability
Wavelength Repeatability is the random uncertainty in reproducing a wavelength after detuning and re-setting the wavelength. The wavelength repeatability is ± half the span between the maximum and the minimum value of all actual values of these wavelengths. Example test condition: uninterrupted TLS output power, constant power level, temperature within operating temperature range, coherence control off, short time span. Note: NOTE The long-term wavelength repeatability can be obtained by taken the wavelength repeatability and wavelength stability into account.


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