Integrated Phase Detector Using 3x3 MMI Couplers
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Solution Overview
Problem
Conventional phase detection apparatuses, particularly those using optical fibers, face challenges in integration due to the difficulty in incorporating magnet-based components like Faraday rotators and the inability to achieve desired phase differences when transitioning to integrated chip form, limiting their application in high-performance systems.
Innovation Solution
The development of an integrated phase detector utilizing multi-mode interference couplers, including a 2×2 and 3×3 MMI couplers, with a bias unit and balanced optical detectors to detect phase errors between optical and microwave signals, enabling phase modulation and interference signal analysis for precise phase detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional optical fiber-based phase detection apparatuses are used, then phase detection capability is achieved, but integration into chip form is difficult due to magnet-based components like Faraday rotators
Solution Approach 1:
The patent replaces magnet-based Faraday rotators with all-optical multi-mode interference couplers that use optical path differences to achieve phase detection. This substitution eliminates the need for magnetic components, enabling integration onto photonic chips while maintaining phase detection functionality.
Solution Approach 2:
The patent extracts and removes the magnet-based Faraday rotator components from the phase detection system, retaining only the essential phase detection functionality through optical interference mechanisms that can be integrated on-chip.
2Ease of manufacture
If conventional phase detection structures are transitioned to integrated chip form, then integration is achieved, but desired phase differences cannot be obtained
Solution Approach 1:
The patent changes the operational parameters by using multi-mode interference couplers with specific mode coupling characteristics to generate the required phase differences. By controlling optical path lengths and interference conditions in the integrated structure, precise phase detection is achieved without relying on magnet-based components.
Solution Approach 2:
The patent introduces a new dimension of control by utilizing multiple optical modes simultaneously in the interference couplers. This multi-dimensional approach to phase control enables precise phase detection in integrated form by exploiting mode-dependent phase differences.
3Ease of manufacture
If multi-mode interference couplers are used for integration, then chip integration is achieved, but fabrication errors affect performance
Solution Approach 1:
The patent incorporates a feedback mechanism where the actual interference pattern is measured and used to adjust operating conditions or compensation parameters, thereby compensating for fabrication variations and maintaining detection accuracy in integrated implementations.
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 allows for the integration of phase detection systems on chips, achieving maximum sensitivity and compensating for fabrication errors, thereby overcoming the limitations of conventional optical fiber-based detectors and enabling their use in advanced applications.
Implementation Method 1
a first multi-mode interference coupler that receives the optical signal and outputs optical signals with a plurality of modes
Implementation Method 2
a modulated signal generated through performing a phase modulation on another of the optical signals with the plurality of modes by the microwave signal
Implementation Method 3
a second multi-mode interference coupler that receives one of the optical signals with the plurality of modes and a modulated signal, and outputs a first optical interference signal and a second optical interference signal
Implementation Method 4
a balanced optical detector that detects an electrical signal corresponding to a timing error between the optical signal and the microwave signal, by converting, to the electrical signal, information of an intensity difference between the first optical interference signal and the second optical interference signal
Data Source
AI summary
The present disclosure relates to an integrated phase detector. In an embodiment, a first multi-mode interference coupler that receives the optical signal and outputs optical signals with a plurality of modes, and a second multi-mode interference coupler that receives one of the optical signals with the plurality of modes and a modulated signal generated through performing a phase modulation on another of the optical signals with the plurality of modes by the microwave signal, and outputs a first optical interference signal and a second optical interference signal may be included.