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Compact and Athermal DQPSK Demodulator with Silica-Based Planar Lightwave Circuit
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We present a full description of a polarization-independent athermal differential quadrature phase shift keying (DQPSK) demodulator that employs silica-based planar lightwave circuit (PLC) technology. Silica-based PLC DQPSK demodulator has good characteristics including low polarization dependence, mass producibility, etc. However delay line interferometer (DLI) of demodulator had the large temperature dependence of its optical characteristics, so it required large power consumption to stabilize the chip temperature by the thermo-electric cooler (TEC). We previously made a quick report about an athermal DLI to reduce a power consumption by removing the TEC. In this paper, we focus on the details of the design and the fabrication method we used to achieve the athermal characteristics, and we describe the thermal stability of the signal demodulation and the reliability of our demodulator. We described two athermalization methods; the athermalization of the transmission spectrum and the athermalization of the polarization property. These methods were successfully demonstrated with keeping a high extinction ratio and a small footprint by introducing a novel interwoven DLI configuration. This configuration can also limit the degradation of the polarization dependent phase shift (PDf) to less than 1/10 that with the conventional configuration when the phase shifters on the waveguide are driven. We used our demodulator and examined its demodulation performance for a 43 Gbit/s DQPSK signal. We also verified its long-term reliability and thermal stability against the rapid temperature change. As a result, we confirmed that our athermal demodulator performed sufficiently well for use in DQPSK systems.
- Publication
- IEICE TRANSACTIONS on Electronics Vol.E93-C No.7 pp.1191-1198
- Publication Date
- 2010/07/01
- Publicized
- Online ISSN
- 1745-1353
- DOI
- 10.1587/transele.E93.C.1191
- Type of Manuscript
- PAPER
- Category
- Optoelectronics
Authors
Yusuke NASU
Yohei SAKAMAKI
Kuninori HATTORI
Shin KAMEI
Toshikazu HASHIMOTO
Takashi SAIDA
Hiroshi TAKAHASHI
Yasuyuki INOUE
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Yusuke NASU, Yohei SAKAMAKI, Kuninori HATTORI, Shin KAMEI, Toshikazu HASHIMOTO, Takashi SAIDA, Hiroshi TAKAHASHI, Yasuyuki INOUE, "Compact and Athermal DQPSK Demodulator with Silica-Based Planar Lightwave Circuit" in IEICE TRANSACTIONS on Electronics,
vol. E93-C, no. 7, pp. 1191-1198, July 2010, doi: 10.1587/transele.E93.C.1191.
Abstract: We present a full description of a polarization-independent athermal differential quadrature phase shift keying (DQPSK) demodulator that employs silica-based planar lightwave circuit (PLC) technology. Silica-based PLC DQPSK demodulator has good characteristics including low polarization dependence, mass producibility, etc. However delay line interferometer (DLI) of demodulator had the large temperature dependence of its optical characteristics, so it required large power consumption to stabilize the chip temperature by the thermo-electric cooler (TEC). We previously made a quick report about an athermal DLI to reduce a power consumption by removing the TEC. In this paper, we focus on the details of the design and the fabrication method we used to achieve the athermal characteristics, and we describe the thermal stability of the signal demodulation and the reliability of our demodulator. We described two athermalization methods; the athermalization of the transmission spectrum and the athermalization of the polarization property. These methods were successfully demonstrated with keeping a high extinction ratio and a small footprint by introducing a novel interwoven DLI configuration. This configuration can also limit the degradation of the polarization dependent phase shift (PDf) to less than 1/10 that with the conventional configuration when the phase shifters on the waveguide are driven. We used our demodulator and examined its demodulation performance for a 43 Gbit/s DQPSK signal. We also verified its long-term reliability and thermal stability against the rapid temperature change. As a result, we confirmed that our athermal demodulator performed sufficiently well for use in DQPSK systems.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E93.C.1191/_p
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@ARTICLE{e93-c_7_1191,
author={Yusuke NASU, Yohei SAKAMAKI, Kuninori HATTORI, Shin KAMEI, Toshikazu HASHIMOTO, Takashi SAIDA, Hiroshi TAKAHASHI, Yasuyuki INOUE, },
journal={IEICE TRANSACTIONS on Electronics},
title={Compact and Athermal DQPSK Demodulator with Silica-Based Planar Lightwave Circuit},
year={2010},
volume={E93-C},
number={7},
pages={1191-1198},
abstract={We present a full description of a polarization-independent athermal differential quadrature phase shift keying (DQPSK) demodulator that employs silica-based planar lightwave circuit (PLC) technology. Silica-based PLC DQPSK demodulator has good characteristics including low polarization dependence, mass producibility, etc. However delay line interferometer (DLI) of demodulator had the large temperature dependence of its optical characteristics, so it required large power consumption to stabilize the chip temperature by the thermo-electric cooler (TEC). We previously made a quick report about an athermal DLI to reduce a power consumption by removing the TEC. In this paper, we focus on the details of the design and the fabrication method we used to achieve the athermal characteristics, and we describe the thermal stability of the signal demodulation and the reliability of our demodulator. We described two athermalization methods; the athermalization of the transmission spectrum and the athermalization of the polarization property. These methods were successfully demonstrated with keeping a high extinction ratio and a small footprint by introducing a novel interwoven DLI configuration. This configuration can also limit the degradation of the polarization dependent phase shift (PDf) to less than 1/10 that with the conventional configuration when the phase shifters on the waveguide are driven. We used our demodulator and examined its demodulation performance for a 43 Gbit/s DQPSK signal. We also verified its long-term reliability and thermal stability against the rapid temperature change. As a result, we confirmed that our athermal demodulator performed sufficiently well for use in DQPSK systems.},
keywords={},
doi={10.1587/transele.E93.C.1191},
ISSN={1745-1353},
month={July},}
Copy
TY - JOUR
TI - Compact and Athermal DQPSK Demodulator with Silica-Based Planar Lightwave Circuit
T2 - IEICE TRANSACTIONS on Electronics
SP - 1191
EP - 1198
AU - Yusuke NASU
AU - Yohei SAKAMAKI
AU - Kuninori HATTORI
AU - Shin KAMEI
AU - Toshikazu HASHIMOTO
AU - Takashi SAIDA
AU - Hiroshi TAKAHASHI
AU - Yasuyuki INOUE
PY - 2010
DO - 10.1587/transele.E93.C.1191
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E93-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 2010
AB - We present a full description of a polarization-independent athermal differential quadrature phase shift keying (DQPSK) demodulator that employs silica-based planar lightwave circuit (PLC) technology. Silica-based PLC DQPSK demodulator has good characteristics including low polarization dependence, mass producibility, etc. However delay line interferometer (DLI) of demodulator had the large temperature dependence of its optical characteristics, so it required large power consumption to stabilize the chip temperature by the thermo-electric cooler (TEC). We previously made a quick report about an athermal DLI to reduce a power consumption by removing the TEC. In this paper, we focus on the details of the design and the fabrication method we used to achieve the athermal characteristics, and we describe the thermal stability of the signal demodulation and the reliability of our demodulator. We described two athermalization methods; the athermalization of the transmission spectrum and the athermalization of the polarization property. These methods were successfully demonstrated with keeping a high extinction ratio and a small footprint by introducing a novel interwoven DLI configuration. This configuration can also limit the degradation of the polarization dependent phase shift (PDf) to less than 1/10 that with the conventional configuration when the phase shifters on the waveguide are driven. We used our demodulator and examined its demodulation performance for a 43 Gbit/s DQPSK signal. We also verified its long-term reliability and thermal stability against the rapid temperature change. As a result, we confirmed that our athermal demodulator performed sufficiently well for use in DQPSK systems.
ER -
English
