Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers
We propose a novel scheme for the expansion and comb densification of gain-switched optical frequency combs (GS-OFC). The technique entails mutual injection locking of two gain-switched lasers with a common master to generate a wider bandwidth OFC. Subsequently, the OFC is further expanded and/or de...
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| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/15/7108 |
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| author | Prajwal D. Lakshmijayasimha Prince M. Anandarajah Pascal Landais Aleksandra Kaszubowska-Anandarajah |
| author_facet | Prajwal D. Lakshmijayasimha Prince M. Anandarajah Pascal Landais Aleksandra Kaszubowska-Anandarajah |
| author_sort | Prajwal D. Lakshmijayasimha |
| collection | DOAJ |
| description | We propose a novel scheme for the expansion and comb densification of gain-switched optical frequency combs (GS-OFC). The technique entails mutual injection locking of two gain-switched lasers with a common master to generate a wider bandwidth OFC. Subsequently, the OFC is further expanded and/or densified using a phase modulator with optimum drive conditions. We experimentally demonstrate the generation of an OFC with 45 highly correlated lines separated by 6.25 GHz with an expansion factor ~3. In addition, operating in comb densification mode, the channel spacing of the OFC is tuned from 6.25 GHz to 390.625 MHz. Finally, a detailed characterization of the lines, across the entire expanded comb, is reported highlighting the excellent spectral purity with linewidths of ~40 kHz, a relative intensity noise better than −152 dB/Hz, and a high degree of phase correlation between the comb lines. The proposed method is simple, highly flexible and the architecture is suitable for photonic integration, all of which make such an OFC extremely attractive for the employment in a multitude of applications. |
| first_indexed | 2024-03-10T09:17:43Z |
| format | Article |
| id | doaj.art-4983ea13ea124d41bb8191753536440d |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T09:17:43Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-4983ea13ea124d41bb8191753536440d2023-11-22T05:24:30ZengMDPI AGApplied Sciences2076-34172021-07-011115710810.3390/app11157108Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched LasersPrajwal D. Lakshmijayasimha0Prince M. Anandarajah1Pascal Landais2Aleksandra Kaszubowska-Anandarajah3Photonics Systems and Sensing Lab., School of Electronic Engineering, Dublin City University, Glasnevin, D09 NA55 Dublin, IrelandPhotonics Systems and Sensing Lab., School of Electronic Engineering, Dublin City University, Glasnevin, D09 NA55 Dublin, IrelandPhotonics Systems and Sensing Lab., School of Electronic Engineering, Dublin City University, Glasnevin, D09 NA55 Dublin, IrelandPhotonics Systems and Sensing Lab., School of Electronic Engineering, Dublin City University, Glasnevin, D09 NA55 Dublin, IrelandWe propose a novel scheme for the expansion and comb densification of gain-switched optical frequency combs (GS-OFC). The technique entails mutual injection locking of two gain-switched lasers with a common master to generate a wider bandwidth OFC. Subsequently, the OFC is further expanded and/or densified using a phase modulator with optimum drive conditions. We experimentally demonstrate the generation of an OFC with 45 highly correlated lines separated by 6.25 GHz with an expansion factor ~3. In addition, operating in comb densification mode, the channel spacing of the OFC is tuned from 6.25 GHz to 390.625 MHz. Finally, a detailed characterization of the lines, across the entire expanded comb, is reported highlighting the excellent spectral purity with linewidths of ~40 kHz, a relative intensity noise better than −152 dB/Hz, and a high degree of phase correlation between the comb lines. The proposed method is simple, highly flexible and the architecture is suitable for photonic integration, all of which make such an OFC extremely attractive for the employment in a multitude of applications.https://www.mdpi.com/2076-3417/11/15/7108optical frequency combgain-switched lasermutually injection-locked lasers |
| spellingShingle | Prajwal D. Lakshmijayasimha Prince M. Anandarajah Pascal Landais Aleksandra Kaszubowska-Anandarajah Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers Applied Sciences optical frequency comb gain-switched laser mutually injection-locked lasers |
| title | Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers |
| title_full | Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers |
| title_fullStr | Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers |
| title_full_unstemmed | Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers |
| title_short | Optical Frequency Comb Expansion Using Mutually Injection-Locked Gain-Switched Lasers |
| title_sort | optical frequency comb expansion using mutually injection locked gain switched lasers |
| topic | optical frequency comb gain-switched laser mutually injection-locked lasers |
| url | https://www.mdpi.com/2076-3417/11/15/7108 |
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