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US 11,156,767 B2Granted
Optical fiber and optical transmission system
AssigneeNippon Telegraph and Telephone Corporation
InventorsAzusa Urushibara, Taiji Sakamoto, Masaki Wada, Takashi Yamamoto, Kazuhide Nakajima, Takayoshi Mori
Life of this patent
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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.
Claims11
An optical transmission system comprising:
- a transmission line including an optical fiber;
- a transmitter that is configured to output signal light;
- a mode exciter that is configured to excite a linearly polarized mode of the signal light output from the transmitter to an LP02 mode and input the excited signal light to the transmission line;
- a first mode converter that is configured to convert the linearly polarized mode of the signal light, which is excited to the LP02 mode and output from the transmission line, into a fundamental mode;
- and
- a receiver that is configured to receive the signal light converted into the fundamental mode,
- a second mode converter that is configured to convert the signal light of the LP02 mode into the signal light of the fundamental mode as an unnecessary mode removal device that removes modes other than the LP02 mode between the mode exciter and the first mode converter;
- and
- a third mode converter that is configured to convert the signal light of the fundamental mode into the signal light of the LP02 mode, and another optical fiber which connects the second mode converter and the third mode converter and to which bending is applied, or a single-mode fiber that connects the second mode converter and the third mode converter;
- wherein the optical fiber is configured to propagate the signal light excited to the LP02 mode;
- wherein the optical fiber has 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,
- wherein 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.
10 more elements
An optical transmission system comprising:
- a transmission line including an optical fiber;
- a transmitter that is configured to output signal light;
- a mode exciter that is configured to excite a linearly polarized mode of the signal light output from the transmitter to an LP02 mode and inputs the excited signal light to the transmission line;
- a first mode converter that is configured to convert the linearly polarized mode of the signal light, which is excited to the LP02 mode and output from the transmission line, into a fundamental mode;
- and
- an amplifier that is configured to amplify the signal light converted to the fundamental mode and output from the first mode converter;
- a second mode converter that is configured to excite a linearly polarized mode of the signal light of the fundamental mode amplified by the amplifier to an LP02 mode;
- a third mode converter that is configured to convert the linearly polarized mode of the signal light of the LP02 mode excited by the second mode converter into a fundamental mode;
- and
- a receiver that is configured to receive the signal light of the fundamental mode converted by the third mode converter,
- wherein the optical fiber is configured to propagate the signal light excited to the LP02 mode,
- wherein the optical fiber has 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,
- wherein 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.
11 more elements
An optical transmission system comprising:
- a transmission line including an optical fiber;
- a transmitter that is configured to output signal light;
- a mode exciter that is configured to excite a linearly polarized mode of the signal light output from the transmitter to an LP02 mode and input the excited signal light to the transmission line;
- an excitation light source for Raman amplification;
- a first mode converter that is configured to convert the linearly polarized mode of the excitation light output from the excitation light source for Raman amplification into the LP02 mode;
- an excitation light multiplexer that is configured to multiplex the excitation light converted by the first mode converter to the transmission line;
- a second mode converter that is configured to convert the linearly polarized mode of the signal light output from the transmission line into a fundamental mode;
- and
- a receiver that is configured to receive the signal light converted into the fundamental mode by the second mode converter, wherein the optical fiber is configured to propagate the signal light excited to the LP02 mode,
- wherein the optical fiber has 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,
- wherein 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.
9 more elements
An optical transmission system comprising:
- a transmission line including an optical fiber;
- a transmitter that is configured to output signal light;
- a mode exciter that is configured to excite a linearly polarized mode of the signal light output from the transmitter to an LP02 mode and input the excited signal light to the transmission line;
- an excitation light source;
- a first mode converter that is configured to convert the linearly polarized mode of the excitation light output from the excitation light source into the LP02 mode;
- an excitation light multiplexer that is configured to multiplex the excitation light converted by the first mode converter to the transmission line;
- an amplification fiber that is provided in the transmission line, and is configured to amplify the signal light excited by the excitation light in the mode exciter;
- a second mode converter that is configured to convert the linearly polarized mode of the signal light output from the transmission line into a fundamental mode;
- and
- a receiver that is configured to receive the signal light converted into the fundamental mode by the second mode converter,
- wherein the optical fiber is configured to propagate the signal light excited to the LP02 mode,
- wherein the optical fiber has 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,
- wherein 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.
11 more elements
Dependencies are inferred from the claim text.