Device and method for controlling group velocity delays of pulses propagating in monomode optical fibers of a fiber bundle

摘要

According to one aspect, the invention concerns a device for transporting and controlling light pulses for lensless endo-microscopic imaging and comprises:a bundle of N monomode optical fibers (F_i) arranged in a given pattern, each monomode optical fiber being characterized by a relative group delay value (Ax) defined relative to the travel time of a pulse propagating in a reference monomode optical fiber (F₀) of the bundle of fibers (40),an optical device for controlling group velocity (50) comprising a given number M of waveplates (P_j) characterized by a given delay (8t_j); a first spatial light modulator (51) suitable for forming from an incident light beam a number N of elementary light beams (B_i) each of which is intended to enter into one of said optical fibers, each elementary beam being intended to pass into a given waveplate such that the sum of the delay introduced by said waveplate and the relative group delay of the optical fiber intended to receive said elementary light beam is minimal in absolute value; a second spatial light modulator (52) suitable for deviating each of the N elementary light beams such that each elementary light beam penetrates into the corresponding optical fiber perpendicularly to the entrance face of the optical fiber.