Optical Module Signal Separation Using Small-Angle Incidence Filter
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Solution Overview
Problem
Current optical modules in optical access networks, such as GPON and EPON, face challenges in efficiently separating radio frequency signals from closely spaced data signals, limiting their applicability and performance, especially in next-generation PON systems like NG-PON2, which require improved bandwidth management and signal isolation.
Innovation Solution
The optical module incorporates a band-pass device with a small-angle incidence filter sheet and additional filter sheets with anti-reflection films to separate optical signals by wavelength bands, allowing for the precise passage and reflection of specific optical signals, thereby isolating radio frequency signals from data signals and enhancing the module's compatibility with various optical access networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical modules are used in GPON/EPON systems, then basic optical signal transmission is achieved, but the module cannot efficiently separate radio frequency signals from closely spaced data signals, limiting applicability to next-generation systems like NG-PON2
Solution Approach 1:
The optical module is segmented into distinct functional units with dedicated filter sheets for different wavelength bands. The first filter sheet separates radio frequency signals from data signals, while the second filter sheet further separates uplink and downlink data signals. This segmentation enables efficient signal separation across multiple wavelength bands, making the module adaptable to both traditional GPON/EPON systems and next-generation NG-PON2 systems.
Solution Approach 2:
The patent introduces a dimensional approach to signal separation by using multiple filter sheets arranged at different orientations and positions within the optical module. The first filter sheet is arranged to separate radio frequency signals, while the second filter sheet is positioned to separate uplink and downlink data signals. This multi-dimensional filtering approach enables simultaneous separation of multiple signal types, enhancing both adaptability and reliability.
2Reliability
If traditional filter arrangements are used, then simple structure is maintained, but signal isolation between radio frequency and data signals is insufficient
Solution Approach 1:
The patent merges multiple filtering functions into a single integrated optical module structure. The first filter sheet combines radio frequency signal filtering with data signal transmission, while the second filter sheet integrates uplink and downlink data signal separation. This merging of multiple filtering functions into one compact arrangement achieves high signal isolation without significantly increasing device complexity, as all filters are incorporated into the same optical path management system.
3Productivity
If multiple wavelength bands are handled simultaneously, then bandwidth management is enhanced, but difficulty in detecting and measuring signals increases
Solution Approach 1:
Each filter sheet is designed with specific local quality characteristics optimized for its designated wavelength band. The first filter sheet has optical properties tailored for separating radio frequency signals, while the second filter sheet has properties optimized for separating uplink and downlink data signals. This local optimization of filter characteristics enables effective handling of multiple wavelength bands while maintaining signal detection accuracy, as each filter is specifically tuned to its target wavelength range.
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 solution effectively separates radio frequency and data signals, enabling the optical module to be applied to a broader range of optical access networks, including NG-PON2, by ensuring accurate signal processing and improved bandwidth management, thus enhancing the module's performance and applicability.
Implementation Method 1
a small-angle incidence filter sheet, including a common port, a passing port and a reflection port, wherein among optical signals transmitted to the band-pass device F1 via the common port over an optical fiber connected with the optical module, the optical signal in a first optical wavelength band is passed by the small-angle incidence filter sheet
Implementation Method 2
a filter sheet F2 configured to pass the optical signal in a second optical wavelength band emitted by the laser emission unit to the reflection port of the band-pass device F1 and to reflect the optical signal in a third optical wavelength band
Data Source
AI summary
An optical module and an optical device applicable to the optical module, wherein the optical module includes a laser emission unit, a laser reception unit, a video detector and an optical assembly, the optical assembly including: a band-pass device F1 with a small-angle incidence filter sheet, wherein among optical signals transmitted to F1 via a common port of F1, the optical signal in a first optical wavelength band is passed by the small-angle incidence filter sheet and output to the video detector via the passing port thereof; and the optical signals in other bands are reflected by the small-angle incidence filter sheet and output via the reflection port thereof; a filter sheet F2 configured to pass the optical signal emitted by the laser emission unit to the reflection port of F1 and to reflect the optical signal, received by the laser reception unit, output via the reflection port of F1.