Orthogonal frequency division multiple access (OFDMA) based passive optical network (PON) architecture and its extension to long distance
First Claim
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1. A passive optical network (PON) device, comprising:
- an optical line terminal (OLT) receiver configured to receive multiple signals at different optical wavelengths simultaneously and enable multiple transmitters to operate at the same time during one upstream time slot, wherein the OLT is coupled to a plurality of optical network units (ONUs) and the ONUs are each assigned a different wavelength;
wherein the optical line terminal employs Orthogonal Frequency Division Multiple Access (OFDMA) to transparently support a plurality of applications and enable dynamic bandwidth allocation among these applications where the bandwidth is allocated in two dimensional frequency and time space, such that bandwidth for a given frequency is allocated across multiple optical wavelengths andwherein the OLT and the ONUs exchange OFDMA frames that include allocated areas in both time and frequency for each ONU.
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Abstract
A passive optical network (PON) device, system and method include an optical line terminal (OLT) receiver configured to receive multiple signals at different wavelengths simultaneously and enable multiple transmitters to operate at the same time during one upstream time slot. The optical line terminal employs Orthogonal Frequency Division Multiple Access (OFDMA) to transparently support a plurality of applications and enable dynamic bandwidth allocation among these applications where the bandwidth is allocated in two dimensional frequency and time space.
27 Citations
14 Claims
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1. A passive optical network (PON) device, comprising:
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an optical line terminal (OLT) receiver configured to receive multiple signals at different optical wavelengths simultaneously and enable multiple transmitters to operate at the same time during one upstream time slot, wherein the OLT is coupled to a plurality of optical network units (ONUs) and the ONUs are each assigned a different wavelength; wherein the optical line terminal employs Orthogonal Frequency Division Multiple Access (OFDMA) to transparently support a plurality of applications and enable dynamic bandwidth allocation among these applications where the bandwidth is allocated in two dimensional frequency and time space, such that bandwidth for a given frequency is allocated across multiple optical wavelengths and wherein the OLT and the ONUs exchange OFDMA frames that include allocated areas in both time and frequency for each ONU. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A passive optical network (PON) network, comprising:
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an optical line terminal (OLT) receiver configured to receive multiple signals at different optical wavelengths simultaneously and enable multiple transmitters to operate at the same time during one upstream time slot; a plurality of optical network units (ONUs) coupled to the OLT over a fiber link, each ONUs associated with an application and assigned a different wavelength; wherein communications between the OLT and the ONUs employ Orthogonal Frequency Division Multiple Access (OFDMA) to transparently support the applications and enable dynamic bandwidth allocation among these applications where the bandwidth is allocated in two dimensional frequency and time space, such that bandwidth for a given frequency is allocated across multiple optical wavelengths, and wherein the OLT and the ONUs exchange OFDMA frames that include allocated areas in both time and frequency for each ONU. - View Dependent Claims (8, 9, 10, 11)
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12. A method for communication over a passive optical network (PON), comprising:
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providing an optical line terminal (OLT) receiver configured to receive multiple signals at different optical wavelengths simultaneously and enable multiple transmitters to operate at the same time during one upstream time slot that is coupled to a plurality of optical network units (ONUs); assigning a different wavelength to each of the plurality of optical network units (ONUs) in communication with the OLT; and forming Orthogonal Frequency Division Multiple Access (OFDMA) frames to transparently support a plurality of applications and enable dynamic bandwidth allocation among these applications where the bandwidth is allocated in two dimensional frequency and time space, such that bandwidth for a given frequency is allocated across multiple optical wavelengths, and wherein the OLT and the ONUs exchange OFDMA frames and further comprising allocating areas in both time and frequency for each ONU. - View Dependent Claims (13, 14)
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Specification