Receiver Optical Module Vertical Arrangement for Compact Footprint
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Solution Overview
Problem
Conventional receiver optical modules for wavelength multiplexed signals are hindered by a two-dimensional arrangement of optical components, which expands the footprint and obstructs installation in compact optical transceivers.
Innovation Solution
The optical module features a first assembly with photodiodes (PDs) and concentrating lenses mounted on a sub-mount directly on the housing bottom, and a second assembly with an optical de-multiplexer and reflector mounted on an upper base that is indirectly attached, allowing for a vertical arrangement that reduces the component area and creates space for electrical components, enabling a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If optical components are arranged two-dimensionally on a base, then the optical module can be easily manufactured, but the footprint area is expanded
Solution Approach 1:
The patent transitions from a two-dimensional arrangement of optical components on a base to a three-dimensional configuration where components are stacked vertically. The optical de-multiplexer, reflector, and photodiodes are arranged in multiple layers along the vertical axis, allowing the same functional components to occupy a smaller horizontal footprint while maintaining optical performance.
2Area of stationary object
If optical components are vertically arranged to reduce footprint, then the module becomes more compact, but the complexity of assembly increases
Solution Approach 1:
The optical module is divided into distinct functional assemblies: an optical de-multiplexer assembly, a reflector assembly, and a photodiode array assembly. Each assembly is independently configured and then integrated through precise optical alignment, managing complexity by modularizing the vertical stack while maintaining compactness.
3Area of stationary object
If optical components are vertically arranged, then space for electrical components is created, but the precision of optical alignment becomes more critical
Solution Approach 1:
Optical alignment marks are pre-established on the base and component substrates before assembly. These alignment marks guide the positioning of the optical de-multiplexer, reflector, and photodiodes during the assembly process, ensuring precise optical coupling is achieved before final integration into the compact vertical configuration.
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 allows for a more compact optical module design without increasing the housing size, facilitating the installation of electrical components and enhancing the module's compactness within optical transceivers.
Implementation Method 1
The wavelength division multiplexed (WDM) system has been popular in the optical communication system
Implementation Method 2
The optical reflector reflects the de-multiplexed optical signals toward respective PDs
Implementation Method 3
a plurality of concentrating lenses each corresponding to respective PDs
Data Source
AI summary
A receiver optical module to facilitate the assembling is disclosed. The receiver optical module includes an intermediate assembly including the optical de-multiplexer and the optical reflector each mounted on the upper base, and the lens and the PD mounted on the sub-mount. The latter assembly is mounted on the bottom of the housing; while, the former assembly is also mounted on the bottom through the lower base. The upper base is apart from the bottom and extends in parallel to the bottom to form a surplus space where the amplifying circuit is mounted.