US 10,122,447 B2 · Free space optical receiver and free space optical receiving method

Abstract

It is impossible to prevent the deterioration of the coupling efficiency between received light and a single mode fiber, and difficult to achieve a higher transmission rate, with respect to a free space optical communication receiver; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes light collecting means for collecting laser light having propagated through a free space transmission path; mode controlling means for separating the laser light collected by the light collecting means into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and outputting the propagation mode beams; a plurality of single mode transmission media for guiding the plurality of propagation mode beams, respectively; and a plurality of light receiving means for receiving the plurality of propagation mode beams respectively through the plurality of single mode transmission media.

Claims17

Dependent claims

A free space optical receiver, comprising:

a light collecting unit configured to collect laser light having propagated through a free space transmission path;
a mode controlling unit configured to separate the laser light collected by the light collecting unit into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and output the propagation mode beams;
a plurality of single mode transmission media configured to guide the plurality of propagation mode beams, respectively;
and
a plurality of light receiving units configured to receive the plurality of propagation mode beams respectively through the plurality of single mode transmission media,
wherein the mode controlling unit produces multimode beams from the laser light and produces a plurality of propagation mode beams obtained by converting high-order mode beams included in the multimode beams into low-order mode beams by controlling the multimode beams.

3 more elements

A free space optical receiver, comprising:

a light collecting unit configured to collect laser light having propagated through a free space transmission path;
a mode controlling unit configured to separate the laser light collected by the light collecting unit into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and output the propagation mode beams;
a plurality of single mode transmission media configured to guide the plurality of propagation mode beams, respectively;
and
a plurality of light receiving units configured to receive the plurality of propagation mode beams respectively through the plurality of single mode transmission media,
wherein the mode controlling unit includes
a multimode transmission medium configured to receive input of the laser light and output multimode beams;
a mode converting unit configured to control the multimode beams and produce a plurality of propagation mode beams obtained by converting high-order mode beams included in the multimode beams into low-order mode beams;
and
a mode separating unit configured to separate the plurality of propagation mode beams and output each propagation mode beam.

7 more elements

Dependencies are inferred from the claim text.

Free space optical receiver and free space optical receiving method

Life of this patent

Free space optical receiver and free space optical receiving method

Life of this patent

Abstract

Claims17