Optical fiber systems for delivering short high power pulses
OwnerSiddharth Ramachandran, Stephan Wielandyinventors
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Abstract
Described is an optical fiber system for delivering ultrashort pulses with minimal distortions due to nonlinearity. The system is based on delivering the optical pulses in a higher order mode (HOM) of a few-moded fiber. The fiber is designed so that the dispersion for the HOM is very large. This results in a dispersion length LD for the delivery fiber that is exceptionally small, preferably less than the non-linear length LNL. Under these conditions the system may be designed so the optical pulses experience minimum non-linear impairment, and short pulse/high peak power levels are reproduced at the output of the delivery fiber.
Claims20
A method comprising:
- (a) generating optical pulses, the optical pulses having a pulse width W,
- (b) propagating the optical pulses through a pulse stretcher,
- (c) converting the propagating mode of the optical pulses to a HOM,
- (d) propagating the optical pulses along a length L of optical fiber to an output, where L is chosen such that the pulse width WO at the output is approximately equal to W.
An optical device comprising:
- (a) a source of optical pulses,
- (b) a pulse stretcher coupled to the source of optical pulses,
- (c) a mode converter coupled to the pulse stretcher,
- (d) an optical fiber coupled to the mode converter, the optical fiber supporting a HOM.
An optical fiber supporting a HOM, and having a dispersion length LD and a non-linear length LNL, where LD is less than LNL.
Dependencies are inferred from the claim text.