Measurement and multiplexing of ultra-low duty cycle Nyquist pulse sequences.
Appl Opt
; 62(12): 3100-3104, 2023 Apr 20.
Article
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| MEDLINE
| ID: mdl-37133156
ABSTRACT
In this paper, we propose a novel, to the best of our knowledge, method to our knowledge for generating and accurately measuring Nyquist pulse sequences with an ultra-low duty cycle of only 0.037, which breaks the limitations caused by the noise and bandwidth of the optical sampling oscilloscope (OSO) by using a narrow-bandwidth real-time oscilloscope (OSC) and an electrical spectrum analyzer (ESA). By this method, it is found that the bias point drift of the dual parallel Mach-Zehnder modulator (DPMZM) is the main cause of the distortion of the waveform. In addition, we increase the repetition rate of Nyquist pulse sequences by a factor of 16 by multiplexing the unmodulated Nyquist pulse sequences.
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MEDLINE
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En
Ano de publicação:
2023
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Article