Band-Multiplexed PONs with Selective ONU Band Reception
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Solution Overview
Problem
Current PON systems face challenges in providing bandwidth options that cater to both high-speed, expensive services and low-speed, cheaper services, as they require faster and more complex ONUs, which increases costs for customers seeking slower services.
Innovation Solution
The implementation of band-multiplexed PONs, which use orthogonal frequency bands and TDMA, allowing ONUs to receive and transmit different classes of bands, enabling flexible bandwidth allocation and reducing the complexity and cost of optical components by allowing lower-speed optics for lower-bandwidth services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PON systems use faster and more complex ONUs to provide high-speed services, then bandwidth capacity is improved, but device complexity and cost increase
Solution Approach 1:
The optical signal is divided into multiple frequency bands (e.g., first band and second band), allowing different ONUs to selectively receive different bands. This segmentation enables bandwidth aggregation across multiple simpler receivers to achieve high-speed service capacity without requiring each individual ONU to process the full high-speed signal, thus reducing device complexity while maintaining high bandwidth capacity.
2Speed
If PON systems provide high-speed services with faster optics, then service quality is improved, but cost increases for customers seeking slower services
Solution Approach 1:
Different ONUs are configured with different receiver bandwidth capabilities matched to their service requirements. Customers needing high-speed services receive multiple frequency bands (first band and second band) for aggregated bandwidth, while customers needing lower speeds receive only a single band. This local customization allows each customer to pay for the optics complexity they actually need, reducing costs for slower services while maintaining high-speed options for those who require them.
3Adaptability or versatility
If PON systems use band-multiplexed optical signals with multiple frequency bands, then bandwidth flexibility is improved, but device complexity increases
Solution Approach 1:
The system dynamically assigns different frequency bands (first band, second band, etc.) to different ONUs based on their bandwidth requirements and service class. ONUs can be configured to receive one band for lower-speed services or multiple bands for high-speed services. This dynamic allocation provides bandwidth flexibility while allowing optical components to be optimized for specific band widths, reducing overall system complexity compared to a static high-capacity design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides options for both high-speed and low-speed services by varying the components of receivers and transmitters in ONUs, accommodating different bandwidth needs while reducing costs by enabling the use of lower-speed optics for lower-bandwidth services.
Implementation Method 1
a DAC configured to convert a digital electrical signal to an analog electrical signal
Implementation Method 2
a laser coupled to the DAC and configured to: generate an optical signal using the analog electrical signal for modulation
Data Source
AI summary
An apparatus comprises a DAC configured to convert a digital electrical signal to an analog electrical signal and a laser coupled to the DAC. The laser is configured to generate an optical signal using the analog electrical signal for modulation, the optical signal is a band-multiplexed optical signal comprising frequency bands, the frequency bands comprise a lowest-frequency band, and the lowest-frequency band comprises a baseband IM signal. The laser is configured to transmit the optical signal. A PON comprises an OLT configured to transmit a downstream optical signal, the downstream optical signal is a band-multiplexed optical signal comprising a first band and a second band. The PON includes a first ONU configured to receive the downstream optical signal and equalize only the first band; and a second ONU configured to receive the downstream optical signal and equalize the first band and the second band.