Single-Fiber BOSA Layout for Compact Wavelength Separation
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Solution Overview
Problem
The installation of a collimating lens in a single-fiber bi-directional optical transceiver sub-assembly (BOSA) increases its size, making it difficult to achieve both improved wavelength separation characteristics and a compact form factor.
Innovation Solution
A BOSA configuration that includes a housing, optical receptacle, multiplexing/demultiplexing filter, photoelectric conversion units, an isolator, and at least one collimating lens positioned to fit within the external size of the housing, allowing for improved wavelength separation while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collimating lens is installed in the BOSA to improve wavelength separation characteristics, then the wavelength separation performance is improved, but the size of the BOSA increases
Solution Approach 1:
The collimating lens is positioned to fit within the existing external dimensions of the BOSA housing, effectively nesting the lens component within the available internal space without requiring external expansion. This allows the wavelength separation function to be added while maintaining the original compact form factor.
Solution Approach 2:
The collimating lens is disposed at a strategically selected position within the three-dimensional space of the BOSA, utilizing unused or underutilized spatial dimensions to accommodate the additional optical component. This spatial optimization enables improved wavelength separation without increasing the overall external envelope of the device.
2Volume of moving object
If the BOSA is designed to be compact, then the size is reduced, but it becomes difficult to install a collimating lens for improved wavelength separation
Solution Approach 1:
The internal structure of the BOSA is optimized with locally tailored spatial zones that accommodate the collimating lens at specific positions. By creating localized spaces with appropriate dimensions and orientations, the design enables the installation of the lens while maintaining the overall compact external size of the housing.
3Ease of manufacture
If the external size of the housing is increased to accommodate a collimating lens, then the lens can be properly positioned, but the compactness of the BOSA is compromised
Solution Approach 1:
The positioning of the collimating lens is achieved through adjustable or flexible mounting mechanisms that allow precise alignment within the constrained housing space. This dynamic positioning capability enables proper lens installation without requiring increased external dimensions, as the lens can be adapted to fit the available internal geometry.
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
The solution enables enhanced wavelength separation characteristics of the multiplexing/demultiplexing filter while preventing an increase in the BOSA's size, facilitating efficient optical communication with improved transmission speeds.
Implementation Method 1
at least one collimating lens, disposed at a position that fits into an external size of the housing, configured to collimate incident light on the multiplexing/demultiplexing filter
Implementation Method 2
wavelength multiplexing communication that divides the wavelength band to be used for transmission and reception
Implementation Method 3
an isolator configured to pass an optical signal outputted from the transmitting-side photoelectric conversion unit and block an optical signal proceeding to the transmitting-side photoelectric conversion unit
Implementation Method 4
a transmitting-side photoelectric conversion unit; a receiving-side photoelectric conversion unit
Data Source
AI summary
Provided is a single-fiber bi-directional optical transceiver sub-assembly capable of improving the wavelength separation characteristics of a multiplexing/demultiplexing filter while also attaining a compact size. A single-fiber bi-directional optical transceiver sub-assembly is provided with a housing, an optical receptacle, a multiplexing/demultiplexing filter, a receiving-side photoelectric converter, a transmitting-side photoelectric converter, an isolator, and a collimating lens. The multiplexing/demultiplexing filter is disposed on the optical path between the optical receptacle and the transmitting-side photoelectric converter and on the optical path between the optical receptacle and the receiving-side photoelectric converter. The isolator passes optical signals outputted from the transmitting-side photoelectric converter and blocks optical signals proceeding to the transmitting-side photoelectric converter. The collimating lens is disposed at a position that fits into the external size of the housing, and collimates incident light on the multiplexing/demultiplexing filter.