Tunable Ring Resonator for Coherent Optical Transceiver Wavelength Separation
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Solution Overview
Problem
Current coherent optical paired channel systems face challenges in separating spectrally close wavelengths and are prone to distortions due to back reflections, with existing solutions like band pass filters being non-tunable and circulators being difficult to integrate into monolithic photonic circuits.
Innovation Solution
The development of an optical paired channel transceiver using a tunable resonant optical structure that optically couples laser input and receiver via resonant and non-resonant paths, allowing for dynamic adjustment to optimize frequency differences and minimize distortions, incorporating components like ring resonators and polarization rotators for efficient signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If band pass filters are used for wavelength separation, then the system can separate upstream and downstream signals, but the filters are non-tunable and have wide spectral transition regions that prevent separation of spectrally close wavelengths
Solution Approach 1:
The patent employs a tunable ring resonator instead of fixed band pass filters. The ring resonator's resonant frequency can be dynamically adjusted by changing its effective refractive index through carrier injection or thermal tuning, enabling precise separation of spectrally close wavelengths while providing adaptability for different frequency configurations.
Solution Approach 2:
The invention changes the physical parameters of the filtering element by using a resonant optical structure whose resonant frequency can be tuned. By adjusting the resonant frequency parameter of the ring resonator, the system achieves precise wavelength separation without the wide spectral transition regions that limit conventional filters.
2Measurement precision
If circulators are used for wavelength separation, then spectrally close or identical upstream and downstream wavelengths can be separated, but circulators cannot be readily integrated into monolithic photonic circuits
Solution Approach 1:
The patent integrates the ring resonator, modulator, and receiver components into a single monolithic photonic circuit on a semiconductor substrate. This merging of components achieves both wavelength separation capability and ease of manufacture through standard semiconductor fabrication processes, eliminating the need for discrete circulator components.
Solution Approach 2:
The invention replaces the mechanical/magnetic circulator structure with an all-optical resonant filtering approach implemented in integrated photonics. The ring resonator provides wavelength separation through optical resonance rather than through the physical path routing mechanisms of circulators, enabling monolithic integration.
3Reliability
If circulators are used for signal separation, then upstream and downstream signals can be separated, but unwanted light from back reflections can pass through the circulator and cause distortions
Solution Approach 1:
The patent uses the resonant structure to selectively pass or block wavelengths. By tuning the resonator to the desired wavelength, back reflections at other wavelengths are naturally suppressed. The resonant filtering converts the potential harm of back reflections into a beneficial wavelength-selective suppression mechanism.
Solution Approach 2:
The ring resonator acts as an intermediary filtering element between the optical channel and the receiver. It selectively couples only the resonant wavelength to the receiver while blocking other wavelengths including back reflections, thereby preventing distortion without requiring additional isolation components.
4Device complexity
If fixed band pass filters are used, then the system structure is simple, but the filters cannot be tuned to optimize frequency differences for different operating conditions
Solution Approach 1:
The patent implements a tunable ring resonator that can dynamically adjust its resonant frequency to match different operating conditions. This dynamic tuning capability is achieved through carrier injection or thermal control, allowing the system to optimize frequency differences while maintaining a relatively simple integrated structure.
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 enables effective separation of spectrally close wavelengths, reduces distortions, and allows for monolithic integration, improving the performance and efficiency of coherent optical paired channel systems by using tunable resonant structures and polarization management.
Implementation Method 1
having a resonance corresponding to one of the transmitter frequency and the receiver frequency such that a resonant one of the inbound signal and the outbound signal is resonantly redirected by the resonant optical structure along a resonant one of the respective paths
Data Source
AI summary
An optical paired channel transceiver component comprises an optical channel interface to concurrently receive an inbound optical signal at a designated receiver frequency, and output an outbound optical signal at a designated transmitter frequency distinct from the receiver frequency; a receiver operable to process the inbound optical signal at the receiver frequency; a laser input interface to receive a laser input at the transmitter frequency to produce the outbound optical signal; and a resonant optical structure optically coupling each of the laser input interface and the receiver to the optical channel interface via respective optical paths, and having a resonance corresponding to one of the transmitter frequency and the receiver frequency such that a resonant one of the inbound signal and the outbound signal is resonantly redirected by the resonant optical structure along a resonant one of the respective paths.