Bidirectional Optical Transceiver Parallel Lens Alignment
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Solution Overview
Problem
The complexity in the structure of bidirectional optical transceiver modules due to perpendicular light source and photodiode orientations leads to increased packaging difficulty and reduced mass productivity, affecting economic efficiency.
Innovation Solution
A bidirectional optical transceiver module design where the light source and photodiode lenses are parallel to each other, incorporating a wavelength distributor, optical filters, collimated light divergence suppression block, EMI suppression block, and optical path controller to improve optical coupling efficiency and reduce interference, while maintaining different wavelengths for Tx and Rx signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light source and photodiode are oriented perpendicularly to each other, then the bidirectional optical transceiver module can share a single optical fiber for input/output, but the structural complexity increases and mass productivity decreases
Solution Approach 1:
The patent transitions from a perpendicular orientation arrangement to a parallel orientation arrangement of the light source and photodiode. This dimensional change in their relative positioning simplifies the packaging structure while maintaining the bidirectional communication capability through the same optical fiber, thereby reducing device complexity without sacrificing adaptability
2Adaptability or versatility
If the light source and photodiode are oriented perpendicularly to each other, then bidirectional communication is enabled, but manufacturing difficulty increases and economic efficiency decreases
Solution Approach 1:
The patent inverts the conventional perpendicular orientation approach by adopting a parallel orientation for the light source and photodiode. This inversion simplifies the manufacturing and packaging processes, making the production of bidirectional optical transceiver modules more economically efficient while preserving the bidirectional communication functionality
3Ease of manufacture
If the light source and photodiode lenses are parallel to each other, then manufacturing is simplified and economic efficiency improves, but optical coupling efficiency may be affected
Solution Approach 1:
The patent introduces a wavelength distributor as an intermediary component between the parallel-oriented light source and photodiode. This intermediary element manages the optical paths and signal directions, ensuring that the parallel orientation does not compromise optical coupling efficiency while maintaining the manufacturing simplicity and economic efficiency benefits
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 design simplifies the manufacturing process, enhances economic efficiency, suppresses electrical interference, and improves optical coupling efficiency by aligning light source and photodiode orientations and using specific optical components to manage signal paths effectively.
Implementation Method 1
an optical filter provided on a predetermined area of a first surface of the wavelength distributor adjacent to the optical Tx block or the optical Rx block and configured to transmit the optical Rx signal and to reflect the optical Tx signal
Implementation Method 2
The optical Tx signal output from the light source of the optical Tx block is converted to a form of a collimated beam through the first lens
Implementation Method 3
incident to the wavelength distributor, reflected by a reflector provided on a predetermined area of a second surface that faces the first surface of the wavelength distributor
Implementation Method 4
a collimated light divergence suppression block configured to improve optical coupling efficiency to the second lens by suppressing divergence of the optical Rx signal output through the optical filter, when a distance between the second lens and the optical filter is greater than or equal to a preset reference
Implementation Method 5
an optical Rx block provided in parallel to the optical Tx block at a predetermined interval therefrom and including a photodiode (PD) configured to receive an optical Rx signal
Data Source
AI summary
A bidirectional optical transceiver module includes an optical Tx block including a light source configured to output an optical Tx signal; an optical Rx block provided in parallel to the optical Tx block and including a PD configured to receive an optical Rx signal; a wavelength distributor configured to change a travel path of the optical Tx signal; an optical filter provided on a predetermined area of a first surface of the wavelength distributor adjacent to the optical Tx or Rx block and configured to transmit the optical Rx signal and reflect the optical Tx signal; a first lens provided between the optical Tx block and the wavelength distributor; a second lens provided between the optical Rx block and the wavelength distributor; and a third lens configured to output the optical Tx signal to outside and output the optical Rx signal from the outside to the wavelength distributor.