Integrated Tunable Optical Equalizer for Dispersion Compensation
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Solution Overview
Problem
Current optical communication systems face limitations with high symbol rate and long-range transceivers due to the drawbacks of electrical and tunable optical dispersion compensators, including limited performance, large size, and high power consumption.
Innovation Solution
An integrated tunable optical equalizer is developed, comprising 1×N couplers and waveguide arms on a substrate with modulators, where a modulator controller drives the modulators to attenuate optical symbol components outside the intended time slot relative to those within, using a combination of amplitude and phase modulation to optimize power distribution and reduce insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tunable optical dispersion compensators are used to achieve high symbol rate compensation, then performance is improved, but device size becomes extremely large and power consumption increases
Solution Approach 1:
The patent integrates the tunable optical equalizer functions directly into the transceiver module, merging previously separate dispersion compensation components with the transceiver. This integration achieves both compact size and high symbol rate performance by combining multiple functions into a single integrated device.
Solution Approach 2:
The optical equalizer uses N waveguide arms (where N≥3) that are coupled between first and second 1×N couplers, creating a segmented structure. Each waveguide arm can be independently controlled by modulators, allowing the system to achieve high symbol rate compensation through coordinated operation of multiple smaller segments rather than a single large component.
2Volume of moving object
If electrical dispersion compensators are used, then device size is reduced, but performance is limited at high symbol rates and power consumption remains high
Solution Approach 1:
The patent replaces electrical dispersion compensation methods with an all-optical solution using waveguide arms and optical modulators. This substitution eliminates the limitations of electrical compensators at high symbol rates while maintaining compact device size, as the optical system directly manipulates light signals without electrical conversion bottlenecks.
3Reliability
If separate module configuration is used for optical equalizer, then performance is improved, but integration with transceiver is lost and device complexity increases
Solution Approach 1:
The patent merges the optical equalizer functions with the transceiver module into a single integrated device. The waveguide arms and modulators are coupled directly to the transceiver components, eliminating the need for separate module connections and reducing overall system complexity while maintaining high symbol rate performance.
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 enhances the performance of high symbol rate and long-range transceivers by effectively compensating for chromatic dispersion and other impairments, reducing power consumption, and integrating the equalizer within the transceiver, thus improving the acceptance and efficiency of optical communication systems.
Implementation Method 1
N waveguide arms integrated on the substrate, having modulators and coupled between the first and second 1×N couplers... driving modulators associated with the N waveguide arms using a modulator controller to provide modulated products
Data Source
AI summary
Provided is an apparatus and method for use thereof. The apparatus, in one embodiment, includes first and second 1×N couplers integrated on a substrate and configured to receive an optical symbol having an intended time slot, N being at least three. The apparatus, in this embodiment, further includes N waveguide arms integrated on the substrate, having modulators and coupled between the first and second 1×N couplers. The apparatus, in this embodiment, additionally, includes a modulator controller configured to drive the modulators such that, following transmission over a distance, components of the optical symbol outside of the intended time slot are attenuated relative to components within the intended time slot.