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N4391B Optical Modulation Analyzer
N4391B Optical Modulation Analyzer consists of a UXR real-time oscilloscope and a calibrated coherent optical receiver. It helps you keep pace with the evolution of symbol rate classes for transceivers for 800 Gb/s, 1.2 Tb/s to 1.6 Tb/s. New O-band version enables coherent signal and device testing in the emerging 1.3 µm wavelength band for intra-datacenter interconnect use.
HIGHLIGHTS
Key Specifications
See the coherent optical modulation analyzer in action
Watch this demo showcasing the Optical Modulation Analyzer (OMA) system, which includes a UXR-Series oscilloscope and coherent optical receiver, as well as an M8194B Arbitrary Waveform Generator, to achieve coherent optical testing speeds exceeding 100 gigabaud.
Learn how to calibrate the OMA and the optical waveforms to perform transmitter and receiver tests on a coherent optical device.
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Extend the capabilities for your Optical Modulation Analyzer
Featured optical modulation resources
Frequently Asked Questions - Optical modulation
Optical modulation is the method of encoding data into optical carrier waves through variations in amplitude, phase, or frequency of the wave.
The different types of optical modulation are amplitude modulation, phase modulation, frequency modulation, quadrature amplitude modulation (QAM), differential phase shift keying (DPSK), and quadrature-phase shift keying (QPSK). QAM and QPSK can be used to encode multiple bits per symbol.
Optical fiber can transmit data faster over optical fiber compared to electrical cables, and optical modulation improves spectral efficiency by encoding multiple bits per symbol. QAM signals use amplitude and phase modulation to encode multiple bits of information into one symbol.
High-speed communications use a variety of modulation schemes to increase the data rate while keeping low signal degradation and high noise immunity, which is especially effective over long ranges compared to electrical cables. Coherent optical communications often use QAM, which allows for high-speed transmission between servers in a data center or between data centers.
The most common impairments in optical communications are chromatic dispersion, polarization mode dispersion, nonlinear effects, attenuation, and signal-to-noise ratio degradation.
Testing coherent optical communication systems and transceivers can involve many instruments depending on the testing. Calibrating test signals requires arbitrary waveform generators (AWG) and high-bandwidth real-time oscilloscopes running vector signal analysis software (VSA). For transceiver testing, optical modulation analyzers (OMA), optical power meters, tunable laser sources, and bit error rate testers (BERT) may be used depending on the test cases or issues being analyzed. The AWG, OMA, and BERT all need to support the data rates and modulation levels of the transceiver under test.
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