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US 7,095,962 B2Granted
Optical transmission system
AssigneeDenso Corporation
InventorHiro Karube
Life of this patent
Estimating the term…
Abstract
An optical transmission system of the present invention includes input ports to which laser beams are respectively input, condensing, input optical elements, input reflectors corresponding one-to-one to the input optical elements each, output reflectors, output optical elements, and output ports. Assume that maximum one and minimum one of optical distances between the input optical elements and the output optical elements are DL and DS, respectively. Then, the beam waist position Q of the laser beam output from the input optical element closest to the input port satisfies a relation: 0.9(DL+DS)/4≦Q≦1.1(DL+DS)/4.
Claims12
An optical transmission system comprising:
- a plurality of input ports to which a plurality of laser beams are respectively input;
- a plurality of input optical elements corresponding one-to-one to said plurality of input ports each for condensing a particular laser beam;
- a plurality of input reflectors corresponding one-to-one to said plurality of input optical elements each for reflecting a particular laser beam condensed;
- a plurality of output reflectors each for further reflecting a particular laser beam;
- a plurality of output optical elements corresponding one-to-one to said plurality of output reflectors each for further condensing the laser beam reflected;
- and
- a plurality of output parts corresponding one-to-one to said plurality of output optical elements each for receiving the laser beam condensed;
- wherein assuming that a maximum optical distance and a minimum optical distance between the input optical element closest to the input port and the output optical element closest to the output port are DL and DS, respectively, a beam radius of the laser beam at an output end of said input port, a wavelength of said laser beam, a distance between said output end and said input optical element and a focal distance of said input optical element are selected such that a beam waist position Q of said laser beam input from said input optical element closet to said input port satisfies a relation:
- 0.9(DL+DS)/4≦Q≦1.1(DL+DS)/4
- wherein the input reflector closest to the input port has a circular configuration having a circular configuration whose radius R has a following relation or a configuration containing said circular configuration:
- 0.6r≦R, and
- there holds a relation:
- r
- =
- W
-
- 1
- +
- (
- λ
- ·
- x
- π
- ·
- W
- 2
- )
- 2
- where W is a beam waist radius of the laser beam, λ is a wavelength of said laser beam, x is a longer one of a distance between the beam waist position of said laser beam and said reflector closest to said input port and a distance between said beam waist position and said reflector closest to said output port, and π is a ratio of a circumference of a circle to a diameter.
26 more elements
An optical transmission system comprising:
- a plurality of ports to which plurality of laser beams are respectively input;
- a plurality of input elements corresponding one-to-one said plurality of ports each for condensing a particular laser beam;
- a plurality of input reflectors corresponding one-to-one to said plurality of input optical elements each for reflecting a particular laser beam condensed;
- a plurality of output reflectors each for further reflecting the laser beam;
- a plurality of output optical elements corresponding one-to-one to said plurality of output reflectors each for further condensing the laser beam reflected;
- and
- a plurality of output ports corresponding one-to-one to said plurality of output optical elements each for receiving the laser beaming condensed;
- wherein assuming that a maximum optical distance and a minimum optical distance between the input optical element closest to the input port and the output optical element closest to the output port are DL and SL, respectively, a beam radius of the laser beam at an output end of said input port, a wavelength of said laser beam, a distance between said output end and said input optical element and a focal distance of said input optical element are selected such that a beam waist position Q of said laser beam output from said input optical element closest to said input port satisfies a relation:
- DS/2≦Q≦DL/2
- wherein the input reflector closest to the input port has a circular configuration having a circular configuration whose radius R has a following relation or a configuration containing said circular configuration:
- 0.6r≦R, and
- there holds a relation;
- r
- =
- W
-
- 1
- +
- (
- λ
- ·
- x
- π
- ·
- W
- 2
- )
- 2
- where W is abeam waist radius of the laser beam, λ is a wavelength of said laser beam, x is a longer one of a distance between the beam waist position of said laser beam and said reflector closest to said input port and a distance between said beam waist position and said reflector closest to said output port, and π is a ratio of a circumference of a circle to a diameter.
26 more elements
Dependencies are inferred from the claim text.