Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line
We analyze a silicon reconfigurable feed-forward optical delay line (ODL) composed of cascaded Mach-Zehnder interferometer (MZI) switches and waveguide delay pairs. Optical delay is step-tuned by switching among optical routes with an incremental length difference. The crosstalk caused by limited ex...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IEEE
2014-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/6675010/ |
| _version_ | 1818410755822714880 |
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| author | Zhilong Chen Linjie Zhou Jianping Chen |
| author_facet | Zhilong Chen Linjie Zhou Jianping Chen |
| author_sort | Zhilong Chen |
| collection | DOAJ |
| description | We analyze a silicon reconfigurable feed-forward optical delay line (ODL) composed of cascaded Mach-Zehnder interferometer (MZI) switches and waveguide delay pairs. Optical delay is step-tuned by switching among optical routes with an incremental length difference. The crosstalk caused by limited extinction ratios (ERs) of MZI switches and the waveguide loss restricts the ODL buffering capacity. A method to suppress the crosstalk and hence expand the buffering capacity is proposed by inserting variable optical attenuators (VOAs) between successive MZI switches. A design example shows that a seven-stage ODL without VOAs can delay 8-98 bits with a tuning step of 1 bit for a 40 Gbit/s non-return-to-zero (NRZ) 2<sup>13</sup> - 1 pseudo-random bit sequence (PRBS) optical signal. When VOAs with a 10 dB attenuation ratio are included, the signal-to-crosstalk ratio (SCR) of the output signal is increased by 17 dB on average, making the ODL capable of delaying 8-135 bits at its maximum. |
| first_indexed | 2024-12-14T10:20:34Z |
| format | Article |
| id | doaj.art-192bbd3acb424b8bbddef632008696d1 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-14T10:20:34Z |
| publishDate | 2014-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-192bbd3acb424b8bbddef632008696d12022-12-21T23:06:37ZengIEEEIEEE Photonics Journal1943-06552014-01-016111110.1109/JPHOT.2013.22926976675010Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay LineZhilong Chen0Linjie Zhou1Jianping Chen2State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, ChinaState Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, ChinaState Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai, ChinaWe analyze a silicon reconfigurable feed-forward optical delay line (ODL) composed of cascaded Mach-Zehnder interferometer (MZI) switches and waveguide delay pairs. Optical delay is step-tuned by switching among optical routes with an incremental length difference. The crosstalk caused by limited extinction ratios (ERs) of MZI switches and the waveguide loss restricts the ODL buffering capacity. A method to suppress the crosstalk and hence expand the buffering capacity is proposed by inserting variable optical attenuators (VOAs) between successive MZI switches. A design example shows that a seven-stage ODL without VOAs can delay 8-98 bits with a tuning step of 1 bit for a 40 Gbit/s non-return-to-zero (NRZ) 2<sup>13</sup> - 1 pseudo-random bit sequence (PRBS) optical signal. When VOAs with a 10 dB attenuation ratio are included, the signal-to-crosstalk ratio (SCR) of the output signal is increased by 17 dB on average, making the ODL capable of delaying 8-135 bits at its maximum.https://ieeexplore.ieee.org/document/6675010/Optical delay line (ODL)Mach–Zehnder interferometer (MZI)variable optical attenuator (VOA)silicon photonicsintegrated optical device |
| spellingShingle | Zhilong Chen Linjie Zhou Jianping Chen Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line IEEE Photonics Journal Optical delay line (ODL) Mach–Zehnder interferometer (MZI) variable optical attenuator (VOA) silicon photonics integrated optical device |
| title | Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line |
| title_full | Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line |
| title_fullStr | Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line |
| title_full_unstemmed | Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line |
| title_short | Analysis of a Silicon Reconfigurable Feed-Forward Optical Delay Line |
| title_sort | analysis of a silicon reconfigurable feed forward optical delay line |
| topic | Optical delay line (ODL) Mach–Zehnder interferometer (MZI) variable optical attenuator (VOA) silicon photonics integrated optical device |
| url | https://ieeexplore.ieee.org/document/6675010/ |
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