Wavelength Tunable Optical Receiver Low Frequency Signal Filtering
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Solution Overview
Problem
Current optical communication networks using a time division/wavelength division-hybrid method face challenges in efficiently selecting optical signal wavelengths, leading to increased system overhead, complexity, and costs, as well as performance deterioration due to the aging effect of wavelength tunable filters.
Innovation Solution
A wavelength tunable optical receiver is designed with a low frequency band electrical signal filter to determine valid signals and set the enable condition of a wavelength tunable optical filter, allowing for efficient wavelength selection in the physical layer without relying on higher layers, thereby minimizing system complexity and costs while preventing performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wavelength selection is performed using higher layer protocols, then wavelength selection can be achieved, but system overhead and complexity increase
Solution Approach 1:
The patent replaces higher layer protocol-based wavelength selection with a physical layer solution using optical filters and electrical signal filtering. The wavelength tunable optical filter physically selects wavelengths while the low frequency band electrical signal filter processes the corresponding electrical signals, eliminating the need for complex higher layer control mechanisms and reducing system overhead.
Solution Approach 2:
The patent introduces a low frequency band electrical signal filter as an intermediary component that works between the optical filter and the detection unit. This intermediary filters out unwanted electrical signals corresponding to non-selected wavelengths, enabling reliable wavelength selection through physical layer processing rather than higher layer protocols.
2Reliability
If wavelength tunable optical filter is used, then wavelength selection is enabled, but performance deteriorates due to aging effect
Solution Approach 1:
The patent implements a feedback mechanism where the detection unit continuously monitors the optical signal and the low frequency band electrical signal filter processes the signal to identify valid wavelengths. This feedback loop enables the system to detect performance degradation due to aging and automatically adjust or replace the optical filter, maintaining reliable signal transmission throughout the filter's operational life.
Solution Approach 2:
The patent performs preliminary filtering of electrical signals at low frequency band before wavelength selection is finalized. This preliminary action identifies valid signals in advance and allows the system to pre-adjust the optical filter settings, preventing performance deterioration by ensuring only valid wavelengths are selected even as the filter ages.
3Measurement precision
If complex wavelength selection method is used, then wavelength selection accuracy is improved, but device complexity and costs increase
Solution Approach 1:
The patent replaces complex multi-layer wavelength selection mechanisms with a straightforward physical layer approach using optical filters combined with simple electrical signal filtering at low frequency band. This substitution maintains wavelength selection accuracy while significantly reducing device complexity and costs by eliminating the need for complex control protocols and multiple filtering stages.
Solution Approach 2:
The patent extracts the essential function of wavelength selection to the physical layer, separating it from higher layer protocol overhead. By taking out the core wavelength selection capability and implementing it through simple optical and electrical filters, the system achieves accurate wavelength selection without the complexity of higher layer management mechanisms.
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 enables simplified, miniaturized, and cost-effective wavelength selection, ensuring high-quality Wavelength Division Multiplexing (WDM) optical signal transmission by continuously updating wavelength selection conditions to handle aging effects.
Implementation Method 1
a PIN Photo Diode (PD), an Avalanche Photo Diode (APD), and the like are usable. Since a PIN optical diode light receiving device has a wide intrinsic layer, which has the simplest structure and is capable of much absorbing a photon of entering light, in a PN junction of a semiconductor, so that a fast response rate may be recorded by a high current from the outside
Data Source
AI summary
Disclosed are a method and an apparatus for selecting a wavelength by a wavelength tunable optical receiver. The method of selecting a wavelength of a wavelength tunable optical receiver includes: receiving, by the wavelength tunable optical receiver, an optical signal from a wavelength tunable optical transmitter; filtering, by the wavelength tunable optical receiver, the optical signal through a low frequency band electrical signal filter, and obtaining a low frequency signal; determining, by the wavelength tunable optical receiver, whether the low frequency signal is a valid signal based on a current value of the low frequency signal; and when the low frequency signal is the valid signal, obtaining, by the wavelength tunable optical receiver, an enable condition of a wavelength tunable optical filter through which the low frequency signal is selected, in which the low frequency signal includes a control/monitoring signal.