Development of a 64 Gbps Si Photonic Crystal Modulator

Yosuke HINAKURA; Hiroyuki ARAI; Toshihiko BABA

doi:10.1587/transele.2019OCP0004

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Development of a 64 Gbps Si Photonic Crystal Modulator

Yosuke HINAKURA, Hiroyuki ARAI, Toshihiko BABA

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Summary :

A compact silicon photonic crystal waveguide (PCW) slow-light modulator is presented. The proposed modulator is capable of achieving a 64 Gbps bit-rate in a wide operating spectrum. The slow-light enhances the modulation efficiency in proportion to its group index n_g. Two types of 200-µm-long PCW modulators are presented. These are low- and high-dispersion devices, which are implemented using a complementary metal-oxide-insulator process. The lattice-shifted PCW achieved low-dispersion slow-light and exhibited n_g ≈ 20 with an operating spectrum Δλ ≈ 20 nm, in which the fluctuation of the extinction ratio is ±0.5 dB. The PCW device without the lattice shift exhibited high-dispersion, for which a large or small value of n_g can be set on demand by changing the wavelength. It was found that for a large n_g, the frequency response was degraded due to the electro-optic phase mismatch between the RF signals and slow-light even for such small-size modulators. Meander-line electrodes, which bypass and delay the RF signals to compensate for the phase mismatch, are proposed. A high cutoff frequency of 55 GHz was theoretically predicted, whereas the experimentally measured value was 38 GHz. A high-quality open eye pattern for a drive voltage of 1 V at 32 Gbps was observed. The clear eye pattern was maintained for 50-64 Gbps, although the drive voltage increased to 3.5-5.3 V. A preliminary operation of a 2-bits pulse amplitude modulation up to 100 Gbps was also attempted.

Publication: IEICE TRANSACTIONS on Electronics Vol.E103-C No.11 pp.635-644

Publication Date: 2020/11/01

Publicized: 2020/06/15

Online ISSN: 1745-1353

DOI: 10.1587/transele.2019OCP0004

Type of Manuscript: Special Section INVITED PAPER (Special Section on Opto-electronics and Communications for Future Optical Network)

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Authors

Yosuke HINAKURA
  Yokohama National University
Hiroyuki ARAI
  Yokohama National University
Toshihiko BABA
  Yokohama National University

Keyword

photonic crystal, optical modulator, silicon photonics

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Yosuke HINAKURA, Hiroyuki ARAI, Toshihiko BABA, "Development of a 64 Gbps Si Photonic Crystal Modulator" in IEICE TRANSACTIONS on Electronics, vol. E103-C, no. 11, pp. 635-644, November 2020, doi: 10.1587/transele.2019OCP0004.
Abstract: A compact silicon photonic crystal waveguide (PCW) slow-light modulator is presented. The proposed modulator is capable of achieving a 64 Gbps bit-rate in a wide operating spectrum. The slow-light enhances the modulation efficiency in proportion to its group index n_g. Two types of 200-µm-long PCW modulators are presented. These are low- and high-dispersion devices, which are implemented using a complementary metal-oxide-insulator process. The lattice-shifted PCW achieved low-dispersion slow-light and exhibited n_g ≈ 20 with an operating spectrum Δλ ≈ 20 nm, in which the fluctuation of the extinction ratio is ±0.5 dB. The PCW device without the lattice shift exhibited high-dispersion, for which a large or small value of n_g can be set on demand by changing the wavelength. It was found that for a large n_g, the frequency response was degraded due to the electro-optic phase mismatch between the RF signals and slow-light even for such small-size modulators. Meander-line electrodes, which bypass and delay the RF signals to compensate for the phase mismatch, are proposed. A high cutoff frequency of 55 GHz was theoretically predicted, whereas the experimentally measured value was 38 GHz. A high-quality open eye pattern for a drive voltage of 1 V at 32 Gbps was observed. The clear eye pattern was maintained for 50-64 Gbps, although the drive voltage increased to 3.5-5.3 V. A preliminary operation of a 2-bits pulse amplitude modulation up to 100 Gbps was also attempted.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.2019OCP0004/_p

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@ARTICLE{e103-c_11_635,
author={Yosuke HINAKURA, Hiroyuki ARAI, Toshihiko BABA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Development of a 64 Gbps Si Photonic Crystal Modulator},
year={2020},
volume={E103-C},
number={11},
pages={635-644},
abstract={A compact silicon photonic crystal waveguide (PCW) slow-light modulator is presented. The proposed modulator is capable of achieving a 64 Gbps bit-rate in a wide operating spectrum. The slow-light enhances the modulation efficiency in proportion to its group index n_g. Two types of 200-µm-long PCW modulators are presented. These are low- and high-dispersion devices, which are implemented using a complementary metal-oxide-insulator process. The lattice-shifted PCW achieved low-dispersion slow-light and exhibited n_g ≈ 20 with an operating spectrum Δλ ≈ 20 nm, in which the fluctuation of the extinction ratio is ±0.5 dB. The PCW device without the lattice shift exhibited high-dispersion, for which a large or small value of n_g can be set on demand by changing the wavelength. It was found that for a large n_g, the frequency response was degraded due to the electro-optic phase mismatch between the RF signals and slow-light even for such small-size modulators. Meander-line electrodes, which bypass and delay the RF signals to compensate for the phase mismatch, are proposed. A high cutoff frequency of 55 GHz was theoretically predicted, whereas the experimentally measured value was 38 GHz. A high-quality open eye pattern for a drive voltage of 1 V at 32 Gbps was observed. The clear eye pattern was maintained for 50-64 Gbps, although the drive voltage increased to 3.5-5.3 V. A preliminary operation of a 2-bits pulse amplitude modulation up to 100 Gbps was also attempted.},
keywords={},
doi={10.1587/transele.2019OCP0004},
ISSN={1745-1353},
month={November},}

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TY - JOUR
TI - Development of a 64 Gbps Si Photonic Crystal Modulator
T2 - IEICE TRANSACTIONS on Electronics
SP - 635
EP - 644
AU - Yosuke HINAKURA
AU - Hiroyuki ARAI
AU - Toshihiko BABA
PY - 2020
DO - 10.1587/transele.2019OCP0004
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E103-C
IS - 11
JA - IEICE TRANSACTIONS on Electronics
Y1 - November 2020
AB - A compact silicon photonic crystal waveguide (PCW) slow-light modulator is presented. The proposed modulator is capable of achieving a 64 Gbps bit-rate in a wide operating spectrum. The slow-light enhances the modulation efficiency in proportion to its group index n_g. Two types of 200-µm-long PCW modulators are presented. These are low- and high-dispersion devices, which are implemented using a complementary metal-oxide-insulator process. The lattice-shifted PCW achieved low-dispersion slow-light and exhibited n_g ≈ 20 with an operating spectrum Δλ ≈ 20 nm, in which the fluctuation of the extinction ratio is ±0.5 dB. The PCW device without the lattice shift exhibited high-dispersion, for which a large or small value of n_g can be set on demand by changing the wavelength. It was found that for a large n_g, the frequency response was degraded due to the electro-optic phase mismatch between the RF signals and slow-light even for such small-size modulators. Meander-line electrodes, which bypass and delay the RF signals to compensate for the phase mismatch, are proposed. A high cutoff frequency of 55 GHz was theoretically predicted, whereas the experimentally measured value was 38 GHz. A high-quality open eye pattern for a drive voltage of 1 V at 32 Gbps was observed. The clear eye pattern was maintained for 50-64 Gbps, although the drive voltage increased to 3.5-5.3 V. A preliminary operation of a 2-bits pulse amplitude modulation up to 100 Gbps was also attempted.
ER -