Inductive Peaking for Optical Ring Modulator Bandwidth
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Solution Overview
Problem
Conventional optical ring modulators face a trade-off between bandwidth and power consumption, with increased Quality factor leading to decreased bandwidth and susceptibility to temperature fluctuations, and they require high drive voltage and power consumption.
Innovation Solution
Incorporating an inductor between the p-n junction and a contact pad in an optical ring modulator, allowing for increased bandwidth by storing signal energy and modifying the refractive index, thereby enhancing the modulator's frequency response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the Quality factor (Q) of the optical ring modulator is increased to achieve lower power consumption and enhanced energy efficiency, then power consumption is reduced, but the bandwidth of the optical ring modulator decreases
Solution Approach 1:
The patent changes the electrical parameters of the modulator by introducing an inductor in series with the p-n junction, transforming the electrical response characteristics. This modifies the impedance and frequency response of the modulator circuit, enabling bandwidth enhancement without requiring changes to the optical resonator structure itself.
Solution Approach 2:
The inductor acts as an intermediary electrical component between the drive signal and the p-n junction. It mediates the electrical response by storing and releasing energy in its magnetic field, thereby shaping the frequency response and extending the bandwidth without directly affecting the optical resonance conditions.
2Use of energy by stationary object
If the Quality factor (Q) of the optical ring modulator is increased to achieve lower power consumption, then energy efficiency is enhanced, but the modulator becomes more susceptible to temperature fluctuations
Solution Approach 1:
By introducing the inductor, the patent changes the electrical time constants and damping characteristics of the modulator. This modifies how the system responds to thermal perturbations, potentially reducing the Q-factor's sensitivity to temperature variations while maintaining energy efficiency.
3Power
If conventional optical ring modulators use high drive voltage to achieve modulation, then modulation depth is sufficient, but power consumption increases
Solution Approach 1:
The inductor changes the electrical impedance profile and voltage distribution across the p-n junction. By optimizing the electrical time constants, the modulator can achieve effective modulation with reduced drive voltage, as the inductor helps maintain the necessary voltage swing across the junction more efficiently.
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
The integration of an inductor significantly increases the bandwidth of the optical ring modulator, achieving a 3-dB frequency of 68.3 GHz, a 24.3 GHz improvement over conventional designs, while maintaining energy efficiency and reducing power consumption.
Implementation Method 1
Incorporating an inductor between the p-n junction and a contact pad in an optical ring modulator, allowing for increased bandwidth by storing signal energy
Implementation Method 2
changing the index of refraction of the ring, either by injecting excess minority carriers in the associated PIN junction or by changing the reverse bias voltage applied to the PN junction
Data Source
AI summary
An integrated optical modulator includes, in part, a pair of waveguides and an inductor. The first waveguide is adapted to receive an incoming optical signal. The second waveguide includes a portion placed in proximity of the first waveguide so as to enable the incoming optical signal travelling in the first waveguide to couple to the second waveguide. The second waveguide comprises a p-n junction. The inductor has a first terminal coupled to the p-n junction and a second terminal coupled to a contact pad. The second waveguide has a circular shape. The inductor optionally has a spiral shape.