发明名称 |
Even-Order Harmonic Cancellation and Increased RF Gain Using Dual-Output Mach-Zehnder Modulator with Two Wavelength Input |
摘要 |
A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths λ1, λ2 are input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.
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申请公布号 |
US2010266289(A1) |
申请公布日期 |
2010.10.21 |
申请号 |
US20100688062 |
申请日期 |
2010.01.15 |
申请人 |
THE GOVERNMENT OF THE US, AS REPRESENTED BY THE SECRETARY OF THE NAVY |
发明人 |
DEVGAN PREETPAUL S.;URICK VINCENT J.;WILLIAMS KEITH J.;DIEHL JOHN F.;SUNDERMAN CHRISTOPHER E. |
分类号 |
H04B10/12;H04B10/00;H04B10/06 |
主分类号 |
H04B10/12 |
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