Tunable Optical Band-Pass Filter for Dynamic Wavelength Control
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Solution Overview
Problem
Existing optical wavelength multiplexing and dividing devices with fixed band-pass filters are unable to adapt their center wavelength and band width, leading to suboptimal performance and delayed malfunction detection when faced with varying transmission distances and fiber characteristics, and can be compromised by improper signal inputs.
Innovation Solution
Incorporating a tunable optical band-pass filter capable of changing its center wavelength and band width based on stored wavelength band control information, with a control system to manage these changes and prevent improper signal passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed optical band-pass filter is used, then the device structure is simple, but the center wavelength and band width cannot be adjusted to match varying transmission conditions
Solution Approach 1:
The patent applies the dynamics principle by making the optical band-pass filter tunable rather than fixed. The filter's center wavelength and band width can be dynamically adjusted based on transmission distance and fiber characteristics. This is achieved through a control unit that receives transmission condition information and adjusts the filter parameters accordingly, allowing the system to adapt to varying conditions while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent implements parameter changes by modifying the center wavelength and band width parameters of the optical band-pass filter based on transmission conditions. The control unit changes these parameters dynamically - for example, adjusting the center wavelength to match the optimal wavelength for the given transmission distance and fiber type, and adjusting the band width to optimize signal transmission. This allows the filter to adapt to different transmission scenarios without requiring a completely different device structure.
2Productivity
If additional block wavelength bands are provided, then the communication demand can be coped with, but improper signals can pass through without detection
Solution Approach 1:
The patent applies the feedback principle by implementing a control unit that receives transmission condition information and uses this feedback to verify incoming signals. The control unit compares the received signal's wavelength and other parameters against the expected parameters based on the transmission conditions. If the signal matches the expected parameters, it is allowed to pass; if not, it is blocked. This feedback mechanism ensures that as more wavelength bands are added to increase communication capacity, the system maintains reliability by verifying that incoming signals are proper.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the control unit with transmission condition information and expected signal parameters before signals arrive. The control unit prepares the filtering criteria in advance based on known transmission conditions, such as the wavelength bands that should be active and their expected characteristics. This preliminary preparation allows for rapid verification of incoming signals without delaying transmission, thus maintaining both high communication capacity and signal reliability.
3Ease of manufacture
If the optical band-pass filter has fixed parameters, then the device is easier to manufacture, but system performance is suboptimal for varying transmission distances and fiber characteristics
Solution Approach 1:
The patent applies the dynamics principle by making the optical band-pass filter tunable rather than fixed. The filter's center wavelength and band width can be dynamically adjusted based on transmission distance and fiber characteristics. This is achieved through a control unit that receives transmission condition information and adjusts the filter parameters accordingly, allowing the system to adapt to varying conditions while maintaining a relatively simple structure.
Solution Approach 2:
The patent implements universality by designing a single optical band-pass filter that can perform multiple functions by adjusting its parameters. Instead of manufacturing different fixed filters for different transmission conditions, the system uses one tunable filter that can be configured for various transmission distances, fiber types, and wavelength bands. This multi-functional approach maintains ease of manufacture (using a single filter design) while achieving adaptability to different performance requirements.
Data Source
AI summary
To equip an optical wavelength dividing multiplexing system with a variable optical band-pass filter, and to provide an apparatus to change the center wavelength and the band width of an optical-band pass filter according to an optical wavelength band to be transmitted, and a method of controlling the apparatus. An optical wavelength multiplexing device 100 includes a CPL (multiplexing portion) 3 that multiplexes optical signals and outputs the multiplexed signal, a BPF (optical band-pass filter)9 that is capable of changing its center wavelength and band width and receives an optical multiplex signal output by the multiplexing portion and lets the received optical multiplex signal pass therethrough, a storage portion that stores wavelength band control information 4 specifying the center wavelength and the band width, and a control portion that controls the center wavelength and the band width of the BPF 9 based on the wavelength band control information 4. The control circuit 10 controls the center wavelength and the band width of the BPF 9 based on the wavelength band control information 4.