WDM ring transmission system having reduced adjacent channel cross-talk
First Claim
Patent Images
1. An optical communication apparatus, comprising:
- a plurality of optical emitters, each supplying a corresponding one of a plurality of optical signals, each of said optical signals being at a respective one of a plurality of wavelengths, said plurality of wavelengths conforming to a channel plan whereby said plurality of wavelengths successively increase from a lowest wavelength to a highest wavelength, said plurality of wavelengths including said lowest and highest wavelengths;
a first plurality of optical add/drop elements respectively coupled to corresponding ones of said plurality of optical emitters and configured to be coupled to an optical communication path, said first plurality of optical add/drop elements supplying said plurality of optical signals to said optical communication path; and
a second plurality of optical add/drop elements configured to be coupled to said optical communication path, one of said second plurality of optical add/drop elements selecting a first one of said plurality of optical signals at a first one of said plurality of wavelengths, said one of said second plurality of optical add/drop elements being provided adjacent one of said first plurality of optical add/drop elements coupled to one of said plurality of optical emitters supplying a second one of said plurality of optical signals at a second one of said plurality of wavelengths, said second one of said plurality of wavelengths being spaced from said first one of said plurality of wavelengths by at least one wavelength in said channel plan.
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Abstract
A WDM ring configuration having reduced adjacent channel cross-talk is disclosed. In the WDM ring, an add/drop element having a filter for selecting an optical signal at a desired wavelength is spaced from another add/drop element having a filter adding an optical signal at an adjacent wavelength within a channel plan by at least one add/drop element that adds/drops an optical signal at a wavelength which is not next to either the optical signal at the desired wavelength or the adjacent wavelength.
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Citations
19 Claims
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1. An optical communication apparatus, comprising:
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a plurality of optical emitters, each supplying a corresponding one of a plurality of optical signals, each of said optical signals being at a respective one of a plurality of wavelengths, said plurality of wavelengths conforming to a channel plan whereby said plurality of wavelengths successively increase from a lowest wavelength to a highest wavelength, said plurality of wavelengths including said lowest and highest wavelengths; a first plurality of optical add/drop elements respectively coupled to corresponding ones of said plurality of optical emitters and configured to be coupled to an optical communication path, said first plurality of optical add/drop elements supplying said plurality of optical signals to said optical communication path; and a second plurality of optical add/drop elements configured to be coupled to said optical communication path, one of said second plurality of optical add/drop elements selecting a first one of said plurality of optical signals at a first one of said plurality of wavelengths, said one of said second plurality of optical add/drop elements being provided adjacent one of said first plurality of optical add/drop elements coupled to one of said plurality of optical emitters supplying a second one of said plurality of optical signals at a second one of said plurality of wavelengths, said second one of said plurality of wavelengths being spaced from said first one of said plurality of wavelengths by at least one wavelength in said channel plan. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical communication apparatus, comprising:
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a plurality of optical emitters, each supplying a corresponding one of a plurality of optical signals, each of said optical signals being at a respective one of a plurality of wavelengths, said plurality of wavelengths conforming to a channel plan whereby said plurality of wavelengths successively increase from a lowest wavelength to a highest wavelength, said lowest and highest wavelengths being included in said plurality of wavelengths; a plurality of optical add/drop elements, each of a first subgroup of said plurality of add/drop elements respectively coupled to corresponding ones of said plurality of optical emitters and configured to be coupled to an optical communication path, said first subgroup of said plurality of optical add/drop elements supplying said plurality of optical signals to said optical communication path, each of a second subgroup of said plurality of add/drop elements respectively selecting one of said plurality of optical signals from said optical communication path, and being spaced, along said optical path, from one of said first subgroup of add/drop elements coupled to one of said plurality of optical emitters supplying another one of said plurality of optical signals at one of said plurality of wavelengths in said channel plan adjacent a wavelength of said one of said plurality of optical signals by at least one of said optical add/drop elements; and a plurality of optical receivers, each of which being respectively coupled to one of said second subgroup of said add/drop elements. - View Dependent Claims (9, 10, 11)
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12. A method for allocating a plurality of optical add/drop elements along a closed optical communication path, said optical communication path being configured to carry a plurality of optical signals, each at a respective one of a plurality of wavelengths, each of said plurality of wavelengths conforming to a channel plan, a first group of said plurality of optical add/drop elements, each being configured to add and drop a respective one of said plurality of optical signals, and a second group of said plurality of optical add/drop elements, each being configured to add and drop a corresponding one of said plurality of optical signals, said method comprising the steps of:
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partitioning said closed optical communication path into first and second sections; subdividing said first section of said closed optical communication path into a plurality of first subsections; subdividing said second section of said optical communication path into a plurality of second subsections; coupling each of said first group of said plurality of add/drop elements to a respective one of said first subsections, successive ones of said coupled first group of said plurality of add/drop elements being respectively configured to add and drop one of said plurality of optical signals at a successive one of said plurality of wavelengths within said channel plan; and coupling each of said second group of said plurality of add/drop elements to a respective one of said second subsections. - View Dependent Claims (13, 14)
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15. A method of allocating a plurality of optical add/drop elements along an optical communication path, said optical communication path being configured to carry a plurality of optical signals, each at a respective one of a plurality of wavelengths, each of said plurality of wavelengths conforming to a channel plan, a first group of said plurality of optical add/drop elements, each being configured to add and drop a respective one of said plurality of optical signals, and a second group of said plurality of optical add/drop elements, each being configured to add and drop a corresponding one of said plurality of optical signals, said method comprising the steps of:
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partitioning said optical communication path into first and second sections; subdividing said first section of said optical communication path into first N subsections, where N is an integer at least equal to three; subdividing said second section of said optical communication path into second N subsections; coupling each of a first group of said plurality of optical add/drop elements to a respective one of said first N subsections, successive ones of said coupled first group of said plurality of add/drop elements being configured to add and drop a respective one of a group of said plurality of optical signals at successive ones of said plurality of wavelengths in said channel plan; and coupling each of a second group of said plurality of optical add/drop elements to a respective one of said second N subsections. - View Dependent Claims (16, 17, 18, 19)
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Specification