Light Receiving Module Parallel Light Wavelength Selectivity
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Solution Overview
Problem
Existing light receiving modules struggle to efficiently convert laser light from optical fibers into parallel light for effective wavelength selection, leading to low wavelength selectivity due to the use of lenses that convert light into converging light, making it difficult to align optical fibers and lenses for optimal signal transmission and reception.
Innovation Solution
A light receiving module with a flat plate-shaped window and a lens positioned between the light receiving element and optical fiber, converting emissive light into parallel light, which then travels through a wavelength-tunable wavelength-selective filter, allowing for improved wavelength selection and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lens is used to convert laser light from optical fiber into converging light for receiving, then the light can be focused to the photodiode, but the wavelength selectivity is reduced because the light does not enter the wavelength-selective filter in parallel form
Solution Approach 1:
The optical path is segmented into distinct functional sections: a first lens for converting optical fiber light into parallel light, a wavelength-selective filter for wavelength selection, and a second lens for focusing the filtered parallel light onto the photodiode. This segmentation allows each component to perform its specific function optimally, with the first lens preparing parallel light for the filter and the second lens focusing the selected wavelength onto the detector.
Solution Approach 2:
Parallel light acts as an intermediary state between the converging light from the optical fiber and the focused light needed by the photodiode. The first lens converts the optical fiber's divergent light into parallel light as an intermediate form that is suitable for wavelength selection by the filter, and then the second lens converts this parallel light into focused light for the photodiode.
2Measurement precision
If a lens is attached to the light receiving element to convert laser light into converging light, then the light can be focused to the photodiode, but the light traveling angles vary between the lens and photodiode areas, reducing wavelength selection effectiveness
Solution Approach 1:
The optical system is divided into two separate lens components with distinct functions: the first lens creates parallel light for uniform filter incidence, and the second lens focuses the parallel light onto the photodiode. This segmentation eliminates the problem of varying light traveling angles by ensuring that all light rays enter the filter in parallel before being focused onto the detector.
Solution Approach 2:
The first lens performs a preliminary action of converting the optical fiber's divergent light into parallel light before the light reaches the wavelength-selective filter. This preliminary conversion ensures that all subsequent wavelength selection occurs with uniformly incident parallel light, eliminating angle-related wavelength selection errors before the light reaches the filter.
3Productivity
If optical fiber and lens are aligned for optimal signal transmission, then transmission efficiency improves, but the complexity of achieving precise optical alignment increases
Solution Approach 1:
The optical coupling system is segmented into multiple independent alignment stages: aligning the optical fiber with the first lens, then aligning the second lens with the photodiode. This segmentation of the alignment process into discrete steps makes the overall alignment procedure more manageable and less complex than attempting to align all components simultaneously.
Solution Approach 2:
The parallel light path serves as an intermediary reference that simplifies alignment. By first establishing the optical fiber-to-first lens alignment to produce parallel light, and then using this parallel light path as a reference for aligning the second lens and photodiode, the alignment process is broken into simpler, more manageable steps with clear reference points.
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 configuration ensures that laser light entering the wavelength-selective filter is in parallel form, enhancing wavelength selectivity and facilitating easier optical alignment, thereby improving the effectiveness of wavelength selection and signal transmission in bidirectional communication systems.
Implementation Method 1
a lens positioned between the light receiving element and optical fiber, converting emissive light into parallel light
Implementation Method 2
wavelength-tunable wavelength-selective filter, allowing for improved wavelength selection
Data Source
AI summary
A light receiving module having a built-in wavelength-tunable wavelength-selective filter that can selectively receive light with a specific wavelength from laser light with various wavelengths emitted from an optical fiber and tune the specific wavelength. In the light receiving module including a light receiving element having a built-in wavelength-tunable wavelength-selective filter that receives laser light from an optical fiber according to the present invention, a flat plate-shaped window (240) transmitting laser light from an optical fiber (600) is formed in the light receiving element (22), a wavelength-tunable wavelength-selective filter for separating wavelengths of laser light traveling as parallel light is disposed in the light receiving element (22), and a lens (400) converting laser light from the optical fiber (600) into parallel light is disposed between the optical fiber (600) and the light receiving element (22).