Optical to Electrical Conversion Module for Legacy Server Connectivity
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Solution Overview
Problem
High-cost optical solutions become inefficient for shorter distances, and coupling high-channel-count optical cables to servers is inefficient due to over-provisioning and duplicative packaging costs, while legacy servers output electrical signals, requiring a cost-effective method to convert optical signals into electrical signals for data transmission.
Innovation Solution
The use of CWDM photonic modules to convert optical signals into multiple electrical signals within a rack-level infrastructure, combining copper and photonics connections for fully-redundant server connectivity, allowing for hot-swapping of modules and reducing the number of fibers by a factor of 4, thus enabling efficient data transmission over longer distances with reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If optical cables are used for long-distance transmission, then signal transmission distance is improved, but cost increases
Solution Approach 1:
The optical signal is segmented into multiple electrical channels (e.g., 4x10Gbps or 8x10Gbps) using demultiplexers, allowing the optical cable to serve multiple server connections simultaneously. This reduces the number of optical cables needed and amortizes the cost across multiple connections.
Solution Approach 2:
An optical-to-electrical conversion module is introduced as an intermediary device that converts optical signals from the cable into multiple electrical signals for distribution to servers. This mediator enables legacy servers to connect via optical infrastructure without requiring optical interfaces, reducing overall system cost.
2Adaptability or versatility
If high-channel-count optical cables are used to connect multiple servers, then connectivity is improved, but packaging costs and complexity increase due to over-provisioning
Solution Approach 1:
The high-channel-count optical cable is segmented into multiple lower-rate electrical connections through demultiplexing. For example, a 40Gbps optical cable is converted into four 10Gbps electrical channels, each connecting to a separate server. This eliminates over-provisioning and reduces packaging complexity.
Solution Approach 2:
The optical-to-electrical conversion module provides universal connectivity by accepting optical input and providing multiple electrical outputs that can connect to various server types including legacy servers. This multi-functionality allows a single optical cable to replace multiple dedicated connections.
3Length of stationary object
If optical signals are transmitted directly to legacy servers, then transmission distance is improved, but compatibility is worsened since legacy servers output electrical signals
Solution Approach 1:
An optical-to-electrical conversion module serves as an intermediary between the optical transmission medium and legacy servers with electrical interfaces. The module converts optical signals to electrical signals, enabling legacy servers to connect to optical infrastructure without requiring hardware upgrades.
Solution Approach 2:
The conversion module replaces the need for optical interfaces on legacy servers by substituting optical signal transmission with electrical signal transmission at the server connection point, while maintaining optical transmission for the long-distance backbone connection.
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 solution provides a cost-effective means to convert optical signals into electrical signals, supporting high-speed gigabit signals without significant degradation, while minimizing wired copper connections and accommodating legacy server technology, thus reducing overall network costs and improving signal integrity.
Implementation Method 1
an optical to electrical transceiver to convert the optical signal into a plurality of electrical signals
Data Source
AI summary
A pluggable module is provided for converting an optical signal to a plurality of electrical signals. The pluggable module may include a printable circuit board (PCB) and an optical connector disposed on a first side of the PCB. The optical connector may route any received optical signal to an optical to electrical transceiver. The optical to electrical transceiver may convert the optical signal to an electrical signal and route the electrical signal to an electrical connector mounted on a second, opposite side of the PCB.