Related Experiment Video
Updated: Jun 16, 2026
07:42
Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator
Published on: December 15, 2021
Ultralong continuously tunable parametric delays via a cascading discrete stage
Yitang Dai1, Yoshitomo Okawachi, Amy C Turner-Foster
1School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA. yd82@cornell.edu
Optics Express
|February 23, 2010
Summary
We demonstrated an all-optical tunable delay line using parametric mixing, achieving a 7.34 µs delay range. This system maintains performance for 10 Gb/s data channels, minimizing dispersion for optical communication systems.
Area of Science:
- Optoelectronics
- Photonics
- Optical Communications
Background:
- Optical delay lines are crucial for signal processing in high-speed communication networks.
- Achieving wide tunable delay ranges while maintaining signal integrity remains a challenge.
Purpose of the Study:
- To experimentally demonstrate an all-optical continuously tunable delay line.
- To characterize its performance for high-speed data transmission.
Main Methods:
- Utilized parametric mixing in silicon waveguides for tunable delay.
- Cascaded discrete wavelength-dependent delays with a tunable stage.
- Employed four-wave mixing for wavelength conversion and optical phase conjugation to minimize dispersion.
Main Results:
- Achieved a total delay range of 7.34 microseconds.
- Demonstrated bit-error rate performance for a 10 Gb/s non-return-to-zero data channel.
- Minimized residual dispersion across the entire tuning range using wavelength-optimized optical phase conjugation.
Conclusions:
- The demonstrated all-optical delay line offers a significant delay range with preserved signal quality.
- This technology is promising for advanced optical signal processing and future high-speed networks.
Related Concept Videos
01:16Cascaded Op Amps
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
01:22Phase-lead and Phase-lag Controllers
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass filters, manage...
01:26PD Controller: Design
In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
01:24Time and frequency -Domain Interpretation of Phase-lead Control
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
01:21Time and frequency -Domain Interpretation of Phase-lag Control
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any finite,...
01:19Limits with Oscillating Discontinuities
An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the most...