Related Experiment Video
Updated: Oct 17, 2025

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.2K
Simultaneous up- and down-frequency mixing based on a cascaded SOA-MZIs link
Applied Optics
|October 6, 2021
Summary
This study demonstrates simultaneous frequency up- and down-conversion for radio-over-fiber applications using cascaded semiconductor optical amplifier Mach-Zehnder interferometers (SOA-MZIs). The novel system achieves high conversion gains and bit rates, enhancing optical transmission efficiency.
Area of Science:
- Photonics and Optical Communications
- Signal Processing
- Radio-over-Fiber (RoF) Technology
Background:
- Radio-over-fiber (RoF) systems require efficient frequency conversion for signal processing.
- Traditional methods often face limitations in conversion efficiency and frequency range.
- Semiconductor Optical Amplifier Mach-Zehnder Interferometers (SOA-MZIs) offer potential for integrated photonic solutions.
Purpose of the Study:
- To investigate simultaneous frequency up- and down-conversion using a cascaded SOA-MZIs link.
- To evaluate the performance of this system for radio-over-fiber applications.
- To demonstrate enhanced efficiency and quality in frequency mixing of Quadrature Phase Shift Keying (QPSK) signals.
Main Methods:
- Utilizing a cascaded SOA-MZIs link for simultaneous frequency conversion.
- Employing intermediate frequency (IF) signals with QPSK data.
- Simulating the optical transmission system using Virtual Photonics Integrated (VPI) software.
Main Results:
- Achieved simultaneous up- and down-conversion with positive conversion gains up to 101.9 GHz (up-conversion) and 86.3 GHz (down-conversion).
- Demonstrated high performance with error vector magnitudes of 15.5% and 18% at respective peak frequencies.
- Fulfilled forward error correction limits for maximum bit rates of 40.5, 81, and 121.5 Gbit/s for QPSK, 16-QAM, and 64-QAM modulations.
Conclusions:
- The cascaded SOA-MZIs link provides a highly efficient and robust solution for simultaneous frequency up- and down-conversion in RoF systems.
- The system supports high-order modulation formats and high bit rates, meeting stringent communication requirements.
- This integrated photonic approach offers significant advantages for future high-frequency optical communication networks.
Related Concept Videos
Cascaded Op Amps
801
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...
801
Upsampling
358
Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
358
Aliasing
296
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
296
Scaling
355
In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...
355
Reconstruction of Signal using Interpolation
406
Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
406
Properties of the z-Transform I
391
The z-transform is a fundamental tool in digital signal processing, enabling the analysis of discrete-time systems through its various properties. It is an invaluable tool for analyzing discrete-time systems, offering a range of properties that simplify complex signal manipulations. One fundamental property is linearity. For any two discrete-time signals, the z-transform of their linear combination equals the same linear combination of their individual z-transforms. This property is essential...
391

