The IQScope from Southern Photonics is an optical complex modulation analyzer for fully characterizing the optical performance of modulators and transmitters. Its hardware and software enable any appropriate equivalent-time oscilloscope to extract the relevant amplitude, phase and polarization information from complex modulation formats. The analyzer can characterize any coherent modulation format, such as 16-QAM (quadrature amplitude modulation) and QPSK (quadrature phase-shift keying) — including polarization multiplexed transmission formats such as dual-polarization QPSK — up to 800 Gb/s, using currently available equivalent-time oscilloscope modules. The IQScope interfaces directly with commonly used oscilloscopes such as the Agilent 86100C/D and the Tektronix DSA8300. Its software runs on the host oscilloscope, providing seamless transition between the coherent modulation analysis tools and the oscilloscope's general-purpose functionality.

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