Tunable dispersion equalizer with a divided thin-film heater for 40-Gb/s RZ transmissions

Matsumoto, Sakiko; Ohira, T.; Takabayashi, M.; Yoshiara, Kiichi; Sugihara, Takashi

doi:10.1109/68.935817

Cited by 46 publications

(12 citation statements)

References 6 publications

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“…The center wavelength of the pass-band is stabilized with a Peltier cooler. We experimentally confirmed that the tunable dispersion range was larger than 300 ps/nm and the amplitude of the group delay ripple was about +/-2.0 ps [43], which is small enough to suppress the eye-opening penalty to 0.5 dB or lower for 40 Gbit/s RZ signal.…”

Section: Chromatic Dispersion Equalizersupporting

confidence: 76%

Recent advances in FEC and adaptive delay equalizing technologies for long-haul transmission systems with 40Gb/s or higher bit-rate per channel

Motoshima

2005

SPIE Proceedings

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40 Gbit/s or higher bit-rate DWDM has been seen as a promising candidate for next generation optical transport networks for some years because it reduces the number of wavelengths, resulting in easier operation and maintenance. It can also potentially reduce the cost and footprint of equipment. However, the reality is that even 40 Gbit/s DWDM has not yet appeared in commercial long-haul systems. This seems to be due not only to financial depression in the market but also to technical difficulties with 40 Gbit/s. The most significant difficulty in 40 Gbit/s systems is that an additional 6 dB of optical signal-to-noise ratio (OSNR) is required compared to 10 Gbit/s systems. One way to gain the 6 dB needed for 40 Gbit/s is by combining (1) the 3 dB provided by the DPSK, with (2) the 3 dB available from the stronger forward error correction technique (FEC). Recent advance in opt-electrical devices and high-speed LSI technologies have made it possible to employ advanced modulation formats and powerful and complex FEC techniques. Another challenge in higher bit-rate transport systems is to extend tolerance against the unwanted waveform distortion due to the wavelength chromatic dispersion and polarization mode dispersion. Various kinds of adaptive delay equalizing technologies have also been proposed to mitigate this issue. In this paper, these enabling technologies will be reviewed and discussed for the near future high-speed and flexible transport networks.

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Section: Chromatic Dispersion Equalizersupporting

confidence: 76%

Recent advances in FEC and adaptive delay equalizing technologies for long-haul transmission systems with 40Gb/s or higher bit-rate per channel

Motoshima

2005

SPIE Proceedings

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“…In the receiver, we used a TDC that consisted of a temperature-controlled CFBG 26 . The configuration and the characteristics are shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Total performances of adaptive dispersion compensation are determined mainly by the measurement range of in-service dispersion monitor and the compensation range of tunable dispersion compensators. [18][19][20][21][22] , chirped fiber Bragg gratings (CFBG's) [23][24][25][26][27][28] , Gires-Tournois (GT) interferometers 29,30 , and virtually imaged phase array (VIPA) 2 . One essential consideration on optical dispersion compensators is that there is a tradeoff relationship between the dispersion compensation range D and the available bandwidth B.…”

Section: Adaptive Dispersion Compensation In Optical Transmission Sysmentioning

confidence: 99%

In-service dispersion monitoring technique using dithered-filter method and its application to fast adaptive compensation in reconfigurable optical networks

2005

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ABSTRUCTWe describe an in-service dispersion monitoring technique which we call dithered-filter method and show its application to adaptive dispersion compensation. In the proposed method, we filter out a portion of the received signal light by a dithered optical band-pass filter and derive the accumulated dispersion from the phase shift of the extracted clock signal. This method does not require any modification of the transmitter, and is applicable to any modulation format as far as the clock signal is extracted. In addition, owing to the dithering and the synchronous detection, high accuracy is realized with a short measurement time less than 200 msec. In this paper, we explain the principle of operation of the proposed method and show the experimental demonstration of fast adaptive dispersion compensation in a 40 Gbit/s reconfigurable optical network.

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“…As a result, compact DCs, which could be incorporated into modules such as XFP and SFP, are strongly desired. Many types of DCs [1][2][3][4][5][6][7] have been developed and demonstrated. Photonic crystals (PC) are other promising candidates for DCs.…”

Section: Introductionmentioning

confidence: 99%

Dispersion compensator based on multiple 1D coupled-defect-type photonic crystals

et al. 2007

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We have developed an ultra compact dispersion compensator based on multiple one dimensional coupled-defect-type photonic crystals, utilizing large optical group velocity dependence on the wavelength without polarization mode dependence. The photonic crystal of the compensator consists of a SiO 2 /Ti 2 O 5 multi-layer thin-film structure and SiO 2 defect layers and was designed for a 1.55-µm, 40-Gbit/s optical communication system. The thin-film structure is substrate-free, which enables the compensator to be small, that is, a 1.4-mm-edge cube. To obtain a large group-velocity difference, 60 substrate-free films are stacked to form the compensator. The passband is 2 nm, and the group delay timedifference within the band is more than 100 ps. A 40-Gbit/s non-return-to-zero optical transmission experiment was carried out with the compensator, demonstrating dispersion-compensation operation over a 10-km standard single-mode fiber, which corresponds to dispersion of 170 ps/nm.

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Tunable dispersion equalizer with a divided thin-film heater for 40-Gb/s RZ transmissions

Cited by 46 publications

References 6 publications

Recent advances in FEC and adaptive delay equalizing technologies for long-haul transmission systems with 40Gb/s or higher bit-rate per channel

Recent advances in FEC and adaptive delay equalizing technologies for long-haul transmission systems with 40Gb/s or higher bit-rate per channel

In-service dispersion monitoring technique using dithered-filter method and its application to fast adaptive compensation in reconfigurable optical networks

Dispersion compensator based on multiple 1D coupled-defect-type photonic crystals

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