STABILIZING APPARATUS FOR TREMOLO SYSTEM FOR STRING INSTRUMEN

摘要

A few-moded fiber device has several discrete sections of few-moded fibers that are separated by mode converters, with each mode converter accomplishing mode conversion between one or more pairs of modes. The mode conversions can be accomplished using a sequence, such as a periodic or cyclic sequence that would cause (1) a signal wave launched with any mode to assume every other mode for one or more times; (2) the number of times the signal remains in any modal state is substantially the same; and (3) the net signal gain or loss or group delay of the input signal is substantially the same regardless of the state of input mode. A laser few-mode amplifier is provided. An optical transmission system is also provided.

主权项

1. A few-moded optical fiber device to process an input optical signal containing N modes, where N is an integer greater than or equal to 2, comprising:
an input few-moded fiber enabled to receive the input signal; at least N mode converters arranged in a pre-determined order, wherein a first mode converter of the N mode converters is coupled to the input few-moded fiber, wherein each mode converter transforms one modal state of the N modal states to a different mode; a few-moded connecting fiber between each of the N mode converters; and an output few-moded fiber coupled to a last mode converter of the N mode converters to provide an output optical signal containing the N modal states, wherein each of the N modes in the optical output signal are characterized by a substantially identical transmission parameter relative to corresponding N modes of the input signal.