Abstract
We propose a novel generalized linear optical sampling (GLOS) technique realized by using an electro-optic frequency comb (EOFC) as the sampling signal. GLOS technique is demonstrated as a bandwidth compression process in frequency domain instead of gating effect in time domain. An EOFC without the limitation to be ultra-short pulse serves as sampling signal is pre-measured. In experiments, the waveforms are sampled by an EOFC with agile repetition rates and bandwidths. After a demodulation process with pre-measured information, the original signal under test in both intensity and phase fields can be recovered. The results obtained from the proposed method are consistent with those from traditional linear optical sampling technique. Besides, with a high average mode power, EOFC-based GLOS technique realizes more than 10 dB SNR improvement and has ability to detect weak signal with a power of -47.3 dBm. Our demonstration opens the way for cost-effective comb sources to be used in optical sampling fields.
Highlights
With the development of generation high-capacity optical communication networks, the bandwidth and data rate of the optical communication signals with advanced modulation formats are respectively beyond 100 GHz and 1 Tb/s [1], [2], which poses high requirement on largebandwidth optical signal monitoring system
The local light of the signal under test (SUT) may be used as the seed laser of the sampling signal generation, and the merit is that same seed laser guarantees the mutual coherence between the sampling signal and SUT, which eliminates the phase noise especially for phase detection
The generated electro-optic frequency comb (EOFC) with a repetition rate of 1 GHz is measured by traditional linear optical sampling (LOS) technique using an mode-locked laser (MLL) (Menlo, FS-250), in which an auxiliary interferometer is used to recover the mutual coherence [12]
Summary
With the development of generation high-capacity optical communication networks, the bandwidth and data rate of the optical communication signals with advanced modulation formats are respectively beyond 100 GHz and 1 Tb/s [1], [2], which poses high requirement on largebandwidth optical signal monitoring system. We propose a novel generalized LOS (GLOS) technique with non-pulse sampling signal, based on the comprehension in frequency domain as a bandwidth compression process.
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