Centralized lightwave WDM-PON employing intensity modulated downstream and upstream
First Claim
Patent Images
1. An optical system, comprising:
- a source-free optical network unit coupled to an optical fiber for receiving a centralized lightwave carrier signal with downstream data over the optical fiber;
the optical network unit including;
a coupler configured to split the original carrier signal into a first path and a second path;
the first path including an optical filter configured to reduce fading effects of the carrier signal; and
the second path including a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for upstream transmission;
wherein the optical filter includes an optical interleaver configured to convert a double sideband signal into a single sideband signal.
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Abstract
An optical system and method includes a source-free optical network unit coupled to an optical fiber for receiving a centralized lightwave carrier signal with downstream data over the optical fiber. The optical network unit includes a coupler configured to split the original carrier signal into a first path and a second path. The first path includes an optical filter configured to reduce fading effects of the carrier signal. The second path includes a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for upstream transmission.
21 Citations
16 Claims
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1. An optical system, comprising:
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a source-free optical network unit coupled to an optical fiber for receiving a centralized lightwave carrier signal with downstream data over the optical fiber; the optical network unit including; a coupler configured to split the original carrier signal into a first path and a second path; the first path including an optical filter configured to reduce fading effects of the carrier signal; and the second path including a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for upstream transmission; wherein the optical filter includes an optical interleaver configured to convert a double sideband signal into a single sideband signal. - View Dependent Claims (2, 3, 4)
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5. An optical system, comprising:
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an optical line terminal (OLT) configured to modulate a downstream data signal by wavelength division multiplexing on a plurality of orthogonal channels for transmission on a centralized lightwave carrier signal; a source-free optical network unit coupled to the OLT by an optical fiber, the optical network unit having a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for transmission back to the OLT, the optical network unit including; a coupler configured to split the original carrier signal into a first path and a second path; the first path including an optical filter configured to reduce fading effects of the carrier signal; and the second path including a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for upstream transmission; wherein the optical filter includes an optical interleaver configured to convert a double sideband signal into a single sideband signal. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for providing a centralized lightwave source, comprising:
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intensity modulating orthogonal frequency division multiplexed signals for transmission on a centralized lightwave carrier signal; receiving the centralized lightwave carrier signal by a source-free optical network unit; splitting the centralized lightwave carrier signal between a first path and a second path; filtering the centralized lightwave carrier signal on the first path to be received by a user; remodulating the centralized lightwave carrier signal on the second path with upstream data to produce an upstream data signal for transmission; and transmitting the upstream data signal; wherein filtering the centralized lightwave carrier signal includes optically interleaving the centralized lightwave carrier signal to convert a double sideband signal to a single sideband signal. - View Dependent Claims (13, 14, 15, 16)
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Specification