MARCH 19, 2010 -- LeCroy Corp. and Optametra will showcase the combination of the former’s high-speed oscilloscope and the latter’s optical modulation analyzer for designs targeted at high-speed transmission using complex modulation formats, including polarization multiplexed quadrature phase-shift keying (PM-QPSK).
LeCroy's WaveMaster 830Zi, a 30-GHz real-time oscilloscope, has already been used to measure 224-Gbps transmission using 56 Gbps per tributary PM-QPSK signals. By integrating the capability of the 30-GHz Optametra OM4106B Coherent Lightwave Signal Analyzer with the real-time 30-GHz bandwidth of the LeCroy WaveMaster 830Zi oscilloscope, the combined instruments offer the highest real-time bandwidth for signal analysis in ultra-long-haul fiber-optic telecommunications, the two companies assert.
Optametra's software operates within the LeCroy oscilloscope, permitting access to all variables in the analysis via Matlab. The combination of instruments assists in the development and testing of proprietary algorithms for the compensation of chromatic dispersion (CD) and polarization mode dispersion (PMD). The combined platform also can be used in conjunction with proprietary modulation schemes, pass-fail criteria, or any user-defined algorithm, the companies assert.
"We are very pleased with the capabilities of the LeCroy oscilloscope," said Daniel van der Weide, vice president of engineering at Optametra. "Access to a 30-GHz real-time oscilloscope with a high sampling rate and superior signal fidelity over such a wide bandwidth enables us to capture the complete electric field of the optical signal and measure everything that can be known about the signal at higher and higher speeds in real-time." (See "Measuring complex optical modulation in fiber" from Lightwave's February 2010 issue for more on such testing.)
The LeCroy WaveMaster 830Zi oscilloscope features a real-time bandwidth of 30 GHz, a sampling rate of 80 Gigasamples/second on two channels, and a maximum acquisition memory of 512 megapoints/channel. Two oscilloscopes can be synchronized together to achieve 30 GHz on four channels to acquire four optical signals.
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