Efficient frequency shifting of dispersive waves at solitons

Area of Science:

• Nonlinear optics
• Fiber optics
• Soliton dynamics

Background:

• Solitons in optical fibers exhibit unique properties, including group velocity horizons.
• Dispersive waves interacting with these horizons can exhibit complex behaviors like tunnelling or frequency shifts.
• Understanding these interactions is crucial for developing advanced optical technologies.

Purpose of the Study:

• To demonstrate and analyze the frequency redshifting and blueshifting of dispersive waves at soliton group velocity horizons.
• To measure the tunnelling probability of waves that cannot propagate through fiber optical solitons.
• To investigate the characteristics of fiber optical Cherenkov radiation within this framework.

Main Methods:

• Experimental demonstration of frequency shifting for dispersive waves interacting with solitons.
• Analytical description of wave tunnelling probability at group velocity horizons.
• Measurement of frequency shift probabilities exceeding 90% for shifts up to two times the soliton spectral width.

Main Results:

• Successfully demonstrated frequency redshifting and blueshifting of dispersive waves at soliton horizons.
• Measured and analytically described the tunnelling probability of waves.
• Achieved over 90% probability for frequency shifts, with shifts up to two times the soliton spectral width, indicating a suppression of tunnelling.
• Discussed high efficiency and large bandwidth of fiber optical Cherenkov radiation.

Conclusions:

• Dispersive waves interacting with fiber optical solitons predominantly undergo frequency shifts rather than tunnelling.
• The observed phenomenon offers a new mechanism for controlling light properties in optical fibers.
• This work provides insights into fiber optical Cherenkov radiation and its potential applications.