Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5449747 | Optics Communications | 2017 | 5 Pages |
Abstract
Linear optical sampling is a promising characterization technique for advanced modulation formats, together with digital signal processing (DSP) and software-synchronized algorithm. We theoretically investigate the acquisition of optical sampling, when the high-speed signal under test is either periodic or random. Especially, when the profile of optical sampling pulse is asymmetrical, the repetition frequency of sampling pulse needs careful adjustment in order to obtain correct waveform. Then, we demonstrate on-field measurement trial of commercial four-channel 128Â Gbps polarization division multiplexing quadrature phase shift keying (PDM-QPSK) signals with truly random characteristics by self-developed equipment. A passively mode-locked fiber laser (PMFL) with a repetition frequency of 95.984Â MHz is used as optical sampling source, meanwhile four balanced photo detectors (BPDs) with 400Â MHz bandwidth and four-channel analog-to-digital convertor (ADC) with 1.25Â GS/s sampling rate are used for data acquisition. The performance comparison with conventional optical modulation analyzer (OMA) verifies that the self-developed equipment has the advantages of low cost, easy implementation, and fast response.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Bin Liu Bin Liu, Zhichao Wu, Songnian Fu, Yonghua Feng, Deming Liu,