The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2024
Filed:
Sep. 17, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Taiji Sakamoto, Musashino, JP;
Masaki Wada, Musashino, JP;
Takashi Yamamoto, Musashino, JP;
Kazuhide Nakajima, Musashino, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
An object of the present invention is to provide an optical transmission system capable of controlling a transmission capacity and a signal processing load of a MIMO equalizer, without depending on the number of propagation modes of the optical fiber. The present optical transmission system includes an optical fiberwith the number of spatial modes being L (an integer of 2 or greater), an optical multiplexerconnected to one end of the optical fiberand configured to input M (a natural number of L or less) signal beams of light to the optical fiberand cause the M input signal beams of light to be propagated for each of the spatial modes of the optical fiber, an optical demultiplexerconnected to another end of the optical fiberand configured to demultiplex a propagated beam of light propagated through the optical fiberfor each of the spatial modes of the optical fiber, N (N=L) receiversconfigured to each receive a demultiplexed beam of light obtained by demultiplexing the propagated beam of light, a signal generation apparatusconfigured to generate P (an integer of from M to L) combined signals from the N received signals, and a P×M MIMO equalizerconfigured to receive the P combined signals to output M demodulated signals.