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Spatially multiplexed picosecond pulse-train generation in a 6 LP mode fiber based on multiple four-wave mixings
Applied Optics
|December 25, 2019
Summary
Researchers generated four spatially multiplexed picosecond pulse trains in a few-mode optical fiber. This breakthrough utilizes parallel nonlinear compression and intramodal four-wave mixing for advanced optical signal processing.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Optical Communications
Background:
- Mode division multiplexing (MDM) is a promising technique for increasing optical fiber capacity.
- Generating high-repetition-rate picosecond pulse trains in few-mode fibers is challenging.
Purpose of the Study:
- To demonstrate the generation of four spatially multiplexed picosecond 40 GHz pulse trains.
- To investigate the use of parallel nonlinear compression in few-mode fibers.
Main Methods:
- Simultaneously injecting four 40 GHz dual-frequency beatings at different wavelengths into LP01, LP11, LP02, and LP12 modes of a graded-index few-mode fiber.
- Utilizing the combined effects of Kerr nonlinearity and anomalous chromatic dispersion.
- Employing intramodal multiple four-wave mixing for nonlinear compression.
Main Results:
- Successfully generated four spatially multiplexed frequency combs.
- Compressed beat signals into well-separated picosecond pulses in the temporal domain.
- Observed output pulse trains with negligible pedestals after demultiplexing from each spatial mode.
Conclusions:
- The study demonstrates a novel method for generating high-repetition-rate, spatially multiplexed picosecond pulse trains.
- This technique shows potential for future high-capacity optical communication systems.
- Parallel nonlinear compression in few-mode fibers is an effective approach for pulse generation.
