公开(公告)号：US20190187365A1

公开(公告)日：2019-06-20

申请号：US16327946

申请日：2017-08-25

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Azusa URUSHIBARA ,  Takayoshi MORI ,  Taiji SAKAMOTO ,  Masaki WADA ,  Takashi YAMAMOTO ,  Kazuhide NAKAJIMA

IPC: G02B6/02 ,  G02B6/14 ,  G02B6/44 ,  H04B10/2581

Abstract: An optical transmission system according to the present disclosure is a mode multiplexed optical transmission system using a multi-mode optical fiber in which a plurality of propagation modes propagate as a transmission line, the optical transmission system including an optical fiber transmission line (83) that includes an optical fiber with two or more propagation modes; and a plurality of mode converters (91) that are configured to generate mode coupling between at least one pair of the propagation modes, in which a variation in an installation interval of the plurality of mode converters (91) is equal to or less than a threshold value determined by the transmission line length (Lt) of the optical fiber transmission line (83).

公开(公告)号：US20200225407A1

公开(公告)日：2020-07-16

申请号：US16633424

申请日：2018-07-31

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Azusa URUSHIBARA ,  Taiji SAKAMOTO ,  Masaki WADA ,  Takashi YAMAMOTO ,  Kazuhide NAKAJIMA ,  Takayoshi MORI

IPC: G02B6/02 ,  H01S3/10 ,  H04B10/2581

Abstract: The optical fiber of the present invention includes a core, and a cladding that is provided on an outer periphery of the core and has a refractive index lower than a refractive index of the core region. In the optical fiber of the present invention, a V value representing a normalized frequency of an LP02 mode is greater than or equal to 4.8 and less than or equal to 6.4.

公开(公告)号：US20190386748A1

公开(公告)日：2019-12-19

申请号：US16312051

申请日：2017-07-04

Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION

Inventor： Takayoshi MORI ,  Taiji SAKAMOTO ,  Takashi YAMAMOTO ,  Kazuhide NAKAJIMA ,  Masaki WADA ,  Azusa URUSHIBARA

IPC: H04B10/2581 ,  G02B6/02 ,  H04B10/50 ,  H04B10/60

Abstract: The optical fiber according to the present disclosure is an optical fiber having a pure silica core which is a step index core through which an LPm1 mode with an effective area of 250 μm2 or more is propagated by setting a relative refractive index difference to 0.60% or less, considering an effective cutoff condition, and only 2 or more modes or the LPm1 mode are propagated, with the optical fiber as the transmission line.