Optical Transceiver Daughter Board with External Circuit Area
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Solution Overview
Problem
The limited interior space of optical transceivers in WDM communication systems poses a challenge for accommodating the necessary tunable laser diodes and large-sized circuits required for precise temperature control, while also minimizing electromagnetic interference (EMI) noise.
Innovation Solution
The optical transceiver design incorporates a daughter board with an extra area outside the main housing space to mount electronic circuits, including a necked portion with a ground layer for EMI shielding, and a shield gasket for enhanced electrical connection and protection, allowing for the installation of tunable laser diodes and necessary control circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If large sized circuits are installed inside the housing for controlling the tunable laser diode, then the control function is improved, but the EMI noise increases and space is insufficient
Solution Approach 1:
The circuit board is divided into two distinct areas: a first area mounted inside the housing for critical control circuits, and a second area extending outside the housing for additional circuits. This segmentation allows separation of EMI-sensitive components from potential interference sources while maintaining functional integration through the continuous circuit board structure.
2Adaptability or versatility
If more electronic circuits are mounted inside the housing, then the tunable function is achieved, but the interior space is exceeded
Solution Approach 1:
The circuit board extends from the traditional two-dimensional plane within the housing into a third dimension by protruding outward. This dimensional extension provides additional mounting area for electronic circuits without increasing the housing volume, effectively solving the space constraint while enabling the tunable laser diode function.
3Area of stationary object
If circuits are placed outside the housing space, then the space constraint is relieved, but the EMI shielding may be compromised
Solution Approach 1:
A ground layer is introduced as an intermediary between the electronic circuits mounted on the second area and the housing. This ground layer provides EMI shielding and electrical connection to the housing, ensuring that circuits placed outside the housing space remain protected from electromagnetic interference while maintaining the space 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 configuration effectively addresses the space constraints by enabling the installation of large-scale electronic circuits for tunable optical transmitters while maintaining reliable EMI shielding, ensuring precise wavelength control and efficient operation within the DWDM standard.
Implementation Method 1
the ground layer of the necked portion and the housing may realize the EMI shield
Implementation Method 2
the shield gasket may contact with the ground layer and the housing
Data Source
AI summary
An optical transceiver of one embodiment includes a transmitter optical subassembly to transmit an optical signal, a receiver optical subassembly to receive an optical signal, a mother board, a daughter board, and a housing. The mother board mounts electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board mounts other electronic circuits that electrically communicate with the optical transmitter optical subassembly and the receiver optical subassembly. The daughter board has an extra area mounting a portion of the other electronic circuits. The housing defines a space for installing the optical transmitter optical subassembly, the receiver optical subassembly, the mother board, and the daughter board. The extra area is disposed outside the space.