研究目的
To improve the spectrally efficient sampling scheme to process wideband optical signals applicable for communications by applying a time-interleaved sampling approach to increase the effective sampling rate.
研究成果
The time-interleaved optical sampling based on temporal lenticular lens successfully processes wideband optical signals up to 80 GHz with ENOB ranging from 4.2 to 3.5, demonstrating high sampling rates without the need for pulsed pumps or wavelength conversion, leading to more efficient spectral usage.
研究不足
The number of channels is limited by spectral resource consumption, nonuniform gain of the EDFA, dispersion of the DCF, and challenges in overcoming inter-channel timing jitter from environmental disturbances. Performance degrades slightly at higher input frequencies.
1：Experimental Design and Method Selection:
The experiment is based on the principle of temporal lenticular lens sampling, which uses space-time duality. A time-interleaved sampling approach with a 4-wavelength scheme is employed to enhance the sampling rate.
2：Sample Selection and Data Sources:
The signal under test (SUT) is a 20 Gb/s NRZ data signal with a 16-bit pattern length, and optical sinusoidal signals from 40 to 80 GHz are generated for characterization.
3：List of Experimental Equipment and Materials:
Equipment includes continuous wave lasers, Mach-Zehnder modulator (MZM), WaveShaper, phase modulator (PM), dispersion compensating fiber (DCF), erbium-doped fiber amplifier (EDFA), optical tunable bandpass filter (TBPF), photodiode (PD), and real-time oscilloscope.
4：Experimental Procedures and Operational Workflow:
The SUT is modulated onto 4 CW laser wavelengths (1543 nm, 1549 nm, 1555 nm, 1561 nm) using an MZM. A WaveShaper introduces -
5：08 ps/nm dispersion to create 5 ps delays between copies. All copies are phase modulated by a 20-GHz sinusoidal wave in a PM, then pass through DCF for dispersion compensation. After amplification by EDFA, an optical filter selects copies, and outputs are sampled and analyzed. Data Analysis Methods:
Sampled data is analyzed using a real-time oscilloscope, with effective number of bits (ENOB) calculated based on IEEE standards, and fast Fourier transform (FFT) used for spectral analysis.
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Mach-Zehnder modulator
Modulates the signal under test onto continuous wave laser light
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WaveShaper
Introduces dispersion to generate temporal delays between signal copies
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Phase modulator
Applies phase modulation to the signal copies using a sinusoidal electrical wave
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Dispersion compensating fiber
Compensates chirp from phase modulation to perform temporal lenticular lens function
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Erbium-doped fiber amplifier
Amplifies the optical signal after dispersion compensation
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Optical tunable bandpass filter
Selects different signal copies and blocks out-of-band noise
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Photodiode
Converts optical sampled output to electrical signal for analysis
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Real-time oscilloscope
Analyzes the electrical signal from the photodiode, used for data sampling and ENOB measurement
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