Reconfigurable Optical Add-Drop Multiplexer With Rotatable Mirrors
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Solution Overview
Problem
Complex dense wavelength division multiplexed (DWDM) systems require efficient monitoring of numerous channels across a wide optical spectrum, which is challenging due to the time and complexity involved in performing measurements.
Innovation Solution
A reconfigurable optical device, such as a reconfigurable optical add/drop multiplexer (ROADM), with rotatable mirror-based optical filter switches that allow any wavelength channel from an input signal to be directed to any output port, enabling flexible and efficient addition or dropping of channels, characterized as colorless, directionless, and contentionless.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring equipment is used for DWDM systems, then measurements can be performed, but the time and complexity of measurements increase significantly
Solution Approach 1:
The optical signal is segmented into individual wavelength channels using an optical spectrum analyzer or wavelength selective switch, allowing each channel to be measured separately and efficiently rather than requiring complex simultaneous measurements of all channels
Solution Approach 2:
An optical spectrum analyzer or wavelength selective switch acts as an intermediary device that simplifies the measurement process by providing a straightforward method to isolate and measure individual wavelength channels, reducing the overall measurement complexity and time
2Adaptability or versatility
If fixed wavelength routing is used, then device structure is simple, but system flexibility and adaptability are reduced
Solution Approach 1:
The system uses dynamically reconfigurable wavelength selective switches with rotatable mirrors that can change their routing configuration in real-time, allowing the same physical device to adapt to different wavelength routing requirements without requiring multiple fixed devices
Solution Approach 2:
A single wavelength selective switch with rotatable mirrors can perform multiple routing functions by changing its mirror orientation, replacing the need for multiple dedicated fixed wavelength devices and thereby increasing system versatility while managing device complexity
3Ease of operation
If dedicated wavelength channels are assigned to specific ports, then signal routing is straightforward, but system reconfigurability is limited
Solution Approach 1:
The rotatable mirrors in the wavelength selective switch enable dynamic reconfiguration of wavelength-to-port mappings, allowing the system to easily change routing assignments by simply rotating mirrors to new angular positions rather than requiring physical reconnection or complex reconfiguration procedures
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 significantly reduces the time and complexity of monitoring in DWDM systems, enhancing overall performance and reducing costs by allowing any wavelength channel to be added or dropped from any port, improving system efficiency and flexibility.
Implementation Method 1
an array of filter switches each of which includes a mirror that is rotatable about first and second axes
Data Source
AI summary
A reconfigurable optical device including input and output ports, and add or drop ports, has a high degree of flexibility such that any wavelength channel from any optical signal introduced through the add ports may be added to any of the optical signals transmitted through the output ports. In addition, any wavelength channel from any optical signal received through the inputs ports may be dropped through any of the drop ports. Furthermore, the optical device is configurable to allow the same wavelength channel from two different optical signals supplied respectively through any two inputs ports to be simultaneously directed to two different drop ports.