Layered Jumper Trace Layout for Common-Mode Rejection Filtering

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Solution Overview

Problem

Existing optical communications devices face limitations in common mode noise reduction due to bandwidth constraints, particularly at millimeter wave frequencies, which affect device performance.

Innovation Solution

Implementing jumper configurations in substrates, such as flexible printed circuits, with cascaded jumper pairs to couple differential traces across different layers, providing enhanced common mode rejection filtering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional filtering methods are used in optical communications devices, then device performance is maintained, but common mode noise reduction is insufficient at millimeter wave frequencies

Engineering Contradiction:

Improvecommon mode noiseVSAvoiddevice performance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The substrate is divided into multiple layers with differential traces distributed across different layers. Jumper configurations connect corresponding differential traces between layers, segmenting the noise filtering function across multiple structural elements rather than using a single conventional filter component.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Jumper configurations serve as intermediary elements that couple differential traces across different substrate layers. These jumpers provide a controlled impedance path that mediates signal transmission while enabling common mode noise rejection through the layered structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If jumper configurations with cascaded jumper pairs are implemented, then common mode rejection ratio improves significantly, but substrate structure complexity increases

Engineering Contradiction:

Improvecommon mode noiseVSAvoidsubstrate structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The jumper configurations serve multiple functions simultaneously: they provide electrical coupling between differential traces across layers, establish controlled impedance pathways, and provide common mode noise rejection. This multi-functionality reduces the need for separate components and justifies the structural complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The solution moves from planar filtering approaches to a three-dimensional layered substrate structure. By distributing differential traces across multiple layers and using vertical jumpers for coupling, the design exploits the third dimension (z-axis) to achieve noise rejection that would be difficult to obtain with conventional two-dimensional filtering.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20250358022A1Systems and methods for common mode rejection (CMR) filtering in a substrate

Publication Date: 2025.11.20 CIENA CORP

AI summary

Aspects of the subject disclosure may include, for example, a substrate, comprising a first layer, a second layer, and an intermediary layer between the first layer and the second layer, a first pair of traces positioned in the first layer, a second pair of traces positioned in the second layer, and a jumper configuration at least partially defined in the intermediary layer, wherein the jumper configuration comprises a pair of vias that are configured for coupling the first pair of traces and the second pair of traces and for providing common mode rejection (CMR) filtering between first signals on the first pair of traces and second signals on the second pair of traces. Other embodiments are disclosed.