Dynamic equalization of differential path loss in an optical distribution network
First Claim
1. An optical network system, comprising:
- an optical hub including an optical detector;
a first optical node including a first optical source coupled to the optical hub through a first optical fiber having a first optical path loss;
a second optical node including a second optical source coupled to the optical hub through a second optical fiber having a second optical path loss; and
an optical distribution network including a power splitter or a wavelength division multiplexer, the first fiber, and the second fiber,wherein the optical detector determines a first optical power received from the first optical source through the first optical fiber,wherein the optical detector determines a second optical power received from the second optical source through the second optical fiber,wherein the optical hub compares the first optical power to the second optical power, wherein when the first optical power exceeds the second optical power by a predetermined threshold, the optical hub generates a message to be sent to the first optical node to cause an adjustment to the first optical power to exceed the second optical power by less than the predetermined threshold, and wherein the message includes a command to adjust an optical power of a laser at the first optical node or a command to adjust a gain of an optical amplifier at the first optical node.
1 Assignment
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Accused Products
Abstract
The differences in the power received from multiple optical network units connected to an optical hub may exceed an allowable dynamic range. The dynamic range may be reduced by determining the power received at the optical hub from each optical network unit and adjusting the power transmitted from one or more optical network units to reduce the overall dynamic range. For each optical network unit, the hub may determine the received optical power in an upstream signal from the optical network unit and receive a digital representation of the transmitted power. The hub may determine to adjust the optical power sent from one or more of the optical network units to reduce the dynamic range. The adjustments to the optical powers at the optical network units may be performed by sending commands from the optical hub to each adjusted optical network unit via a downstream signal.
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Citations
23 Claims
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1. An optical network system, comprising:
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an optical hub including an optical detector; a first optical node including a first optical source coupled to the optical hub through a first optical fiber having a first optical path loss; a second optical node including a second optical source coupled to the optical hub through a second optical fiber having a second optical path loss; and an optical distribution network including a power splitter or a wavelength division multiplexer, the first fiber, and the second fiber, wherein the optical detector determines a first optical power received from the first optical source through the first optical fiber, wherein the optical detector determines a second optical power received from the second optical source through the second optical fiber, wherein the optical hub compares the first optical power to the second optical power, wherein when the first optical power exceeds the second optical power by a predetermined threshold, the optical hub generates a message to be sent to the first optical node to cause an adjustment to the first optical power to exceed the second optical power by less than the predetermined threshold, and wherein the message includes a command to adjust an optical power of a laser at the first optical node or a command to adjust a gain of an optical amplifier at the first optical node. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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determining, by an optical detector at an optical hub, a first optical power received from a first optical source at a first optical node through a first optical fiber; determining, by the optical detector at the optical hub, a second optical power received from a second optical source at a second optical node through a second optical fiber; comparing, at the optical hub, the first optical power to the second optical power; and generating, at the optical hub when the first optical power exceeds the second optical power by a predetermined threshold, a message to be sent to the first optical node to cause an adjustment to the first optical power to exceed the second optical power by less than the predetermined threshold. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An optical communication apparatus comprising:
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at least one processor configured to implement a method comprising; determining a first optical power received from a first optical source at a first optical node through a first optical fiber; determining a second optical power received from a second optical source at a second optical node through a second optical fiber; comparing the first optical power to the second optical power; and generating, in response to the first optical power exceeding the second optical power by a predetermined threshold, a message to cause an adjustment to the first optical power to exceed the second optical power by less than the predetermined threshold. - View Dependent Claims (16, 17)
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18. An optical communication apparatus, comprising:
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at least one memory; at least one processor; and an optical transceiver, wherein the processor is configured to read instructions from the memory and implement an optical communication method, the instructions comprising; code for determining a first optical power received from a first optical source at a first optical node through a first optical fiber; code for determining a second optical power received from a second optical source at second optical node through a second optical fiber; code for comparing the first optical power to the second optical power; and code for generating, in case of the first optical power exceeding the second optical power by a predetermined threshold, a message to be sent to the first optical source to cause an adjustment to the first optical power to exceed the second optical power by less than the predetermined threshold. - View Dependent Claims (19, 20)
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21. An optical system, comprising:
an optical hub including an optical detector, wherein the optical detector determines a first optical power received from a first optical source at a first optical node through a first optical fiber, wherein the optical detector determines a second optical power received from a second optical source at a second optical node through a second optical fiber, wherein the optical hub compares the first optical power to the second optical power, wherein when the first optical power exceeds the second optical power by a predetermined threshold, the optical hub generates a message to be sent to the first optical node to cause an adjustment to the first optical power to exceed the second optical power by less than the predetermined threshold, and wherein the message includes a command to adjust an optical power of a laser at the first optical node, or a command to adjust a gain of an optical amplifier at the first optical node. - View Dependent Claims (22, 23)
Specification