Triplexer Transceiver Parallel Signal Detection
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Solution Overview
Problem
Current triplexer transceivers in broadband passive optical networks (B-PONs) are limited by high costs and suboptimal performance, particularly in separating and detecting downstream data and video signals with overlapping spectral bands, which affects the quality of service and bandwidth utilization.
Innovation Solution
The implementation of a triplexer transceiver using parallel signal detection (PSD) with a three-port optical filter and photodetector, employing low-pass and band-pass filters to separate downstream data and video signals, and coherent detection in multiple stages to shift video signals to a higher frequency range, minimizing crosstalk and insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional separate detection methods are used for downstream data and video signals, then signal separation is achieved, but device complexity and cost increase due to requiring multiple separate detection paths
Solution Approach 1:
The patent combines the detection of downstream data signals and video signals into a single detection path using a unified detector that processes both signal types simultaneously. This merging approach reduces device complexity by eliminating the need for separate detection paths while maintaining reliable signal separation through frequency-based discrimination in the detection process.
Solution Approach 2:
The detector is designed with multi-functionality to handle both data signal detection and video signal detection within a single device. This universal detector performs multiple functions that traditionally required separate specialized detectors, thereby reducing overall device complexity while maintaining the reliability needed for distinct signal separation.
2Reliability
If optical filters are used to separate downstream data and video signals, then signal separation is achieved, but insertion loss increases affecting signal quality
Solution Approach 1:
The patent replaces the traditional mechanical/optical filtering approach with an electrical signal processing approach. Instead of using optical filters that physically separate wavelengths and introduce insertion loss, the invention uses electrical filtering and frequency discrimination in the detection stage to separate data and video signals, thereby eliminating the energy loss associated with optical filtering while maintaining effective signal separation.
3Productivity
If parallel signal detection is implemented, then bandwidth utilization improves, but signal detection complexity increases
Solution Approach 1:
The patent implements parallel signal detection by merging the detection of multiple signals into a unified detection process. The single detector simultaneously processes both data and video signals in parallel streams, improving bandwidth utilization by efficiently handling multiple signals at once while managing detection complexity through the unified approach rather than requiring multiple complex separate detection systems.
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 significantly reduces device costs and enhances network performance by enabling efficient separation and detection of signals, improving bandwidth utilization and quality of service in B-PONs.
Implementation Method 1
an optical filter having a first port coupled to a laser for receiving upstream optical data signals, a second port for passing the upstream optical data signals to a network, and for receiving combined downstream optical data and video signals from the network
Implementation Method 2
a third port for communicating the combined downstream optical data and video signals to a photodetector for simultaneously receiving the combined downstream optical data and video signals and converting the optical data and video signals to electrical signals
Implementation Method 3
A plurality of filters are coupled to the photodetector for separating the combined downstream data and video signals, including a low-pass filter for passing the downstream data signals
Implementation Method 4
and a band-pass filter for passing the video signals
Implementation Method 5
The video signals are coherently detected in a number of stages corresponding to stages of subcarrier modulation (SCM) applied to the video signals. The triplexer transceiver is adapted to receive optical video signals that have been subjected first and second stages of SCM to move the spectra of the SCM video signals to a higher frequency range
Data Source
AI summary
An optical triplexer transceiver that utilizes parallel signal detection for use in broadband passive optical networks (B-PONs). The triplexer transceiver includes an optical filter comprising a first port coupled to a laser for receiving upstream optical data signals, a second port for passing the upstream optical data signals to a network, and for receiving combined downstream optical data and video signals from the network, the video signals modulated by subcarrier modulation (SCM), and a third port for communicating the combined downstream optical data and video signals to a photodetector constructed and arranged for simultaneously receiving the combined downstream optical data and video signals and converting the optical data and video signals to electrical signals. A plurality of filters are coupled to the photodetector for separating the combined downstream data and video signals, including a low-pass filter for passing the downstream data signals, and a band-pass filter for passing the video signals. The video signals are coherently detected in a number of stages corresponding to stages of SCM applied to the video signals. The triplexer transceiver is adapted to receive optical video signals that have been subjected first and second stages of SCM to move the spectra of the SCM video signals to a higher frequency range that does not overlap with a frequency range of the baseband data signals.