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US 2012/0057875 A1Published application
Wavelength division multiplexed passive optical network
AssigneeInfinera Corporation
InventorsRADHAKRISHNAN L. NAGARAJAN, Christopher C. Liou, Masaki Kato
Life of this patent
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Abstract
Consistent with the present disclosure, an optical communication system, such as a passive optical network (PON), is provided that includes an optical line terminal (OLT) and a plurality of optical network units (ONUs). The OLT includes a plurality of photonic integrated circuits that have both optical transmitters and receivers provided therein. Accordingly, the OLT may have fewer components and a simpler, more reliable and cost-effective design than a conventional OLT including discrete components. In addition, various ONU configurations are provided that also have a simple design and fewer components. Thus, ONUs consistent with the present disclosure may also have reduced costs.
Claims29
An apparatus, comprising:
- a substrate;
- a plurality of optical sources provided on the substrate, each of the plurality of optical sources supplying a corresponding one of a first plurality of optical signals, each of the first plurality of optical signals having a corresponding one of a first plurality of wavelengths;
- a plurality of photodiodes provided on the substrate;
- a first arrayed waveguide grating (AWG) provided on the substrate, the first AWG having a plurality of first input waveguides and a second input waveguide, and a first output waveguide and a plurality of second output waveguides,
- wherein each of the plurality of first input waveguides receives a corresponding one of the first plurality of optical signals, and the second output waveguide supplies a first wavelength division multiplexed (WDM) optical signal, and
- the second input waveguide receives a second WDM optical signal including a second plurality of optical signals, each of which having a corresponding one of a second plurality of wavelengths, each of the plurality of second output waveguides supplying a corresponding one of the second plurality of optical signals to a respective one of the plurality of photodiodes;
- and
- a second AWG having a plurality of input waveguides, one of which receiving the first WDM optical signal, the second AWG having an output waveguide, each of the first plurality of wavelengths being spectrally spaced from one another such that the first WDM optical signal is output from the output waveguide of the second AWG.
5 more elements
An apparatus, comprising:
- a plurality of optical sources, each of which supplying a corresponding one of a first plurality of optical signals, each of the first plurality of optical signals having a corresponding one of a first plurality of wavelengths;
- a plurality of photodiodes;
- a first arrayed waveguide grating (AWG), the first AWG having a plurality of first input waveguides and a second input waveguide, and a first output waveguide and a plurality of second output waveguides,
- wherein each of the plurality of first input waveguides receives a corresponding one of the first plurality of optical signals, and the second output waveguide supplies a first wavelength division multiplexed (WDM) optical signal, and
- the second input waveguide receives a second WDM optical signal including a second plurality of optical signals, each of which having a corresponding one of a second plurality of wavelengths, each of the plurality of second output waveguides supplying a corresponding one of the second plurality of optical signals to a respective one of the plurality of photodiodes;
- and
- a second AWG having a plurality of input waveguides, one of which receiving the first WDM optical signal, the second AWG having an output waveguide, each of the first plurality of wavelengths being spectrally spaced from one another such that the first WDM optical signal is output from the output waveguide of the second AWG.
4 more elements
An apparatus, comprising:
- a plurality of optical sources, each of which supplying a corresponding one of a first plurality of optical signals, each of the first plurality of optical signals having a corresponding one of a first plurality of wavelengths;
- a plurality of photodiodes;
- a first arrayed waveguide grating (AWG), the first AWG having a plurality of first input waveguides and a second input waveguide, and a first output waveguide and a plurality of second output waveguides,
- wherein each of the plurality of first input waveguides receives a corresponding one of the first plurality of optical signals, and the second output waveguide supplies a first wavelength division multiplexed (WDM) optical signal, and
- the second input waveguide receives a second WDM optical signal including a second plurality of optical signals, each of which having a corresponding one of a second plurality of wavelengths, each of the plurality of second output waveguides supplying a corresponding one of the second plurality of optical signals to a respective one of the plurality of photodiodes;
- and
- a second AWG having a plurality of input waveguides, one of which receiving the first WDM optical signal, the second AWG having an output waveguide, the first WDM optical signal is output from the output waveguide of the second AWG, the second AWG being a cyclic AWG.
4 more elements
Dependencies are inferred from the claim text.