Optical transmission line
First Claim
1. An optical transmission line comprising:
- a first optical fiber having, as characteristics at a predetermined operating wavelength, a first effective area and a first dispersion slope; and
a second optical fiber optically connected to said first optical fiber so as to let in the signal light that has propagated through said first optical fiber, said second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than said first effective area and a second dispersion slope, said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope and having the same sign as said first dispersion slope.
1 Assignment
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Accused Products
Abstract
The present invention relates to an optical transmission line, applicable to Wave Division Multiplexing (WDM) transmission, having a structure for restraining optical transmission characteristics from deteriorating due to each of the occurrence of nonlinear optical phenomena and the wavelength dispersion. This optical transmission line comprises, at least, a first optical fiber having, as characteristics at the predetermined operating wavelength, a first effective area and a first dispersion slope; and a second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than the first effective area and a second dispersion slope smaller than the first dispersion slope. In particular, the second optical fiber contributes to suppressing the deterioration in its optical transmission characteristics in the whole optical transmission line.
40 Citations
39 Claims
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1. An optical transmission line comprising:
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a first optical fiber having, as characteristics at a predetermined operating wavelength, a first effective area and a first dispersion slope; and a second optical fiber optically connected to said first optical fiber so as to let in the signal light that has propagated through said first optical fiber, said second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than said first effective area and a second dispersion slope, said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope and having the same sign as said first dispersion slope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical transmission line comprising a plurality of optical fibers disposed along a propagating direction of signal light;
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wherein a first optical fiber of a pair of optical fibers selected from said plurality of optical fibers has, as characteristics at a predetermined wavelength, a first effective area and a first dispersion slope; and wherein a second optical fiber of the pair of optical fibers selected from said plurality of optical fibers is disposed so as to let in the signal light that has propagated through said first optical fiber, said second optical fiber having, as characteristics at the predetermined operating wavelength, a secon effective area smaller than said first effective area and a second dispersion slope, said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope and having the same sign as said first dispersion slope. - View Dependent Claims (12, 13)
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14. An optical transmission line comprising:
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a first optical fiber having, as characteristics at a predetermined operating wavelength, a first effective area, a first dispersion slope, and a wavelength dispersion whose absolute value is not greater than 5 ps/nm/km; and a second optical fiber optically connected to said firs optical fiber so as to let in the signal light that has propagated through said first optical fiber, said second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than said first effective area, a second dispersion slope, said second dispersion slope having an absolute smaller than an absolute value of said first dispersion slope and having the same sign as said first dispersion slope, and a wavelength dispersion whose absolute value is not greater than 5 ps/nm/km. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A WDM optical transmission line, comprising:
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a first optical fiber having a first effective area and a first dispersion slope; and a second optional fiber through which a signal light that has propagated through said first optical fiber propagates, said second optical fiber having a second effective area smaller than said first effective area and a second dispersion slope, said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope and having the same sign as said first dispersion slope. - View Dependent Claims (26, 27, 28)
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29. A WDM optical transmission line comprising:
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a first optical fiber having a first effective area and a first dispersion slope; and a second optical fiber having a second effective area smaller than said first effective area and a second dispersion slope said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope having the same sign as said first dispersion slope, wherein, as a whole, said WDM optical transmission line restrains optical transmission characteristics from deteriorating due to occurence of nonlinear optical phenomena by changing an effective area of said whole optical transmission line with intensity reduction of a signal light and reducing optical energy in a unit of sectional area of said first and second optical fibers. - View Dependent Claims (30, 31)
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32. A bidirectional WDM optical transmission line, comprising:
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a first optical fiber having a first effective area and a first dispersion slope; a second optical fiber having a second effective area and a second dispersion slope; and a third optical fiber having a third effective area and a third dispersion slope, wherein said second effective area is smaller than said first and third effective areas and said second dispersion slope, said second dispersion slope having an absolute value which is smaller than absolute values of said first and third dispersion slopes, and wherein each of the first, second and third dispersion slopes have the same sign; and wherein said second optical fiber is disposed between said first and third optical fibers, whereby a signal light propagates in order from said first optical fiber toward said third optical fiber or from said third optical fiber toward said first optical fiber.
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33. An optical transmission line comprising a plurality of optical fibers disposed along a propagating direction of signal light;
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wherein a second optical fiber selected from said plurality of optical fibers has, as characteristics at a predetermined operating wavelength, a first effective area and a first dispersion slope; wherein a second optical fiber selected from said plurality of optical fibers is disposed so as to let in the signal light that has propagated through said first optical fiber, said second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than said first effective area and a second dispersion slope, said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope and said dispersion slope is of the same sign as said first dispersion slope; and wherein the second dispersion slope of said second opticl fiber is a value such that a dispersion slope of a transmission line defined by said first and second optical fibers is reduced to be not greater than 90% of the first dispersion slope of said first optical fiber. - View Dependent Claims (34)
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35. An optical transmission line comprising:
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a first optical fiber having, as characteristics at a predetermined operating wavelength, a first effective area, a first dispersion and a first dispersion slope; and a second optical fiber optically connected to said optical fiber so as to let in the signal light that has propagated through said first optical fiber, said second optical fiber having, as characteristics at the predetermined operating wavelength, a second effective area smaller than said first effective area, a second dispersion and a secons dispersion slope having an absolute value which is smaller than an absolute value of said first dispersion slope, wherein said first dispersion slope and said second dispersion slope are each positive, said first dispersion and said second dispersion are each negative, said first dispersion slope is defined as a gradient of a first dispersion curve with respect to wavelength, and said second dispersion slope is defined as a gradient of a second dispersion curve with respect to wavelength. - View Dependent Claims (36)
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37. A method of configuring a WDM optical transmission line, comprising the steps of:
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preparing a first optical fiber having a first effective area and a first dispersion slope; preparing a second optical fiber having a second effective area smaller than said first effective area and a second dispersion slope, said second dispersion slope having an absolute value smaller than an absolute value of said first dispersion slope and having the same sign as said first dispersion slope; and arranging said first and second optical fiber such that a signal light propagates through in order from said first optical fiber toward said second optical fiber. - View Dependent Claims (38, 39)
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Specification