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Published on: September 5, 2019
All-optical differentiator and high-speed pulse generation based on cross-polarization modulation in a semiconductor
1Institute of Optical Information and Key Laboratory of Luminescence and Optical Information of Ministry of Education, Beijing Jiaotong University, Beijing, China. lzyyh2007@yahoo.com.cn
Optics Letters
|March 14, 2009
Summary
This study introduces an all-optical intensity differentiation method using a semiconductor optical amplifier (SOA) for faster signal processing. The novel scheme achieves minimal differentiation error and can generate short optical pulses.
Area of Science:
- Photonics
- Optical Communications
- Semiconductor Devices
Background:
- All-optical signal processing requires high-speed intensity differentiation.
- Semiconductor optical amplifiers (SOAs) offer fast polarization dynamics.
- Cross-polarization modulation (XPolM) is a key phenomenon in SOAs.
Purpose of the Study:
- To propose and demonstrate an all-optical intensity differentiation scheme using SOA-based XPolM.
- To analyze the performance of the differentiation scheme at high data rates.
- To explore the potential for ultra-high-speed all-optical signal processing.
Main Methods:
- Implementing an all-optical intensity differentiation scheme utilizing XPolM in an SOA.
- Introducing a relative delay between two parts of the input signal.
- Extracting the absolute value of the differential signal using a polarization filter.
- Investigating differentiation errors and eye diagrams at a 12.5 Gbits/s data rate.
Main Results:
- Achieved minimal differentiation error of approximately 0.06 at a sampling time (Delta) of 0.
- Demonstrated the extraction of the absolute value of the differential signal.
- Successfully generated a 20 GHz short pulse train with a pulse width of approximately 10 ps.
- The scheme shows potential for all-optical signal processing beyond 100 Gbits/s due to its fast polarization response.
Conclusions:
- The proposed all-optical intensity differentiation scheme based on SOA-XPolM is effective and accurate.
- The method enables high-speed signal processing and generation of ultrashort optical pulses.
- This technology holds significant promise for future high-capacity optical communication systems.
