Multi-wavelength optical transmitter based on time-domain modulation of directly modulated wavelength-swept light

Taniguchi, Tomohiro; Sakurai, Nozomu; Kimura, Hirokazu; Tsubokawa, Makoto

doi:10.1049/el:20080402

Cited by 7 publications

(7 citation statements)

References 5 publications

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“…1 (a), and we obtained a WDM signal by modulating the wavelength-swept light with a signal that we generated by time-domain multiplexing the data of each channel [3]. With this method, we can realize a super dense WDM signal with a spacing of 12.5 GHz using a simple configuration and without the need for WDM filters.…”

Section: Tolerance To Fwm Crosstalk In Wavelength-swept Wdmmentioning

confidence: 99%

“…In such a super dense WDM system, it is essential to employ a multi-wavelength optical transmitter that generates a number of wavelength channels, and precisely stabilizes their wavelengths. As a promising solution, we have already proposed a multiwavelength optical transmitter with a simple configuration based on the use of wavelength-swept light [3]. With the proposed method, super dense WDM signals can be realized by the time-domain modulation of wavelength-swept light using a single light source and modulator without the need for WDM filters.…”

Section: Introductionmentioning

confidence: 99%

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Experimental demonstration of tolerance to FWM crosstalk in wavelength-swept WDM access systems

Taniguchi

Sakurai

Kimura

et al. 2009

IEICE Electron. Express

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Abstract:We confirm the tolerance of our proposed wavelengthswept wavelength division multiplexing (WDM) access system to fourwave mixing (FWM) crosstalk induced during fiber transmission. Since wavelength-swept light is employed as the carrier in the proposed system, there is little mutual interaction between different channel signals. Therefore, the tolerance to FWM crosstalk of the proposed technique is superior to that of conventional methods based on continuous-wave carriers. As a proof-of-concept, we perform experimental 10-and 20-km single-mode fiber transmissions of four-channel 1.25 Gb/s/ch WDM signals with a 12.5 GHz spacing, and show that FWM crosstalk has no serious impact even with a high optical power of +19 dBm.

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Section: Tolerance To Fwm Crosstalk In Wavelength-swept Wdmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of tolerance to FWM crosstalk in wavelength-swept WDM access systems

Taniguchi

Sakurai

Kimura

et al. 2009

IEICE Electron. Express

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show abstract

“…For such SD-WDM access systems, a key technology is a multi-wavelength optical transmitter, which generates plural wavelength channels and precisely locks the wavelength channel spacing. As a promising solution, we have already proposed a multiwavelength optical transmitter based on the time-domain modulation of a wavelength-swept light [2,3]. With this technique, we can realise a WDM signal with a super-dense grid, e.g.…”

mentioning

confidence: 99%

“…around 0.1 nm (12.5 GHz in the 1550 nm band), using only a single light source and a modulator. In [2,3], we demonstrated the generation and selective detection of a four-channel 1.25/2.5 Gbit/s SD-WDM signal with a direct detection scheme.In this Letter, we propose a spectrum shaping technique to apply heterodyne detection to the receiving sides. Heterodyne detection is a coherent detection method which offers the advantages of high sensitivity and fine wavelength selectivity compared with a direct detection scheme, and is expected to be a key technology in future fibre-optic networks including access areas [4,5].…”

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confidence: 99%

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Heterodyne detection of wavelength-swept super-dense WDM signal employing spectrum shaping

et al. 2009

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A spectrum shaping technique is proposed for a previously proposed wavelength-swept wavelength division multiplexing (WDM) transmitter to allow it to be employed for heterodyne detection in the receiver side. With this technique, image rejection for all channels is performed on the transmitting side using a single optical periodic filter, therefore image-induced crosstalk can be suppressed. Furthermore, the selective heterodyne detection of a multi-channel 1.0 Gbit/s/ch super-dense WDM is demonstrated using a 12.5 GHz MZI filter as the spectrum shaping filter.Introduction: Wavelength division multiplexing (WDM) is a promising technique for meeting the growing demand for increased bandwidth and various types of services in the optical access network. In future access networks (especially with regards to downlinks), we require techniques for super-dense WDM (SD-WDM) [1] so that we can provide attractive additional services, such as high-quality video distribution or ondemand services, within the narrow spectral range unoccupied by existing access systems. For such SD-WDM access systems, a key technology is a multi-wavelength optical transmitter, which generates plural wavelength channels and precisely locks the wavelength channel spacing. As a promising solution, we have already proposed a multiwavelength optical transmitter based on the time-domain modulation of a wavelength-swept light [2,3]. With this technique, we can realise a WDM signal with a super-dense grid, e.g. around 0.1 nm (12.5 GHz in the 1550 nm band), using only a single light source and a modulator. In [2,3], we demonstrated the generation and selective detection of a four-channel 1.25/2.5 Gbit/s SD-WDM signal with a direct detection scheme.In this Letter, we propose a spectrum shaping technique to apply heterodyne detection to the receiving sides. Heterodyne detection is a coherent detection method which offers the advantages of high sensitivity and fine wavelength selectivity compared with a direct detection scheme, and is expected to be a key technology in future fibre-optic networks including access areas [4,5]. Since heterodyne detection requires no phase synchronisation between the signal and the local light, the approach is easier to implement than homodyne detection. However, since there is a problem with respect to image-induced crosstalk [6], an image rejection operation is needed in all channels to achieve sufficient reception quality. With the proposal, the image rejection of all the channels is performed on the transmitting side using a single optical periodic filter. As proof of concept, we demonstrate the selective heterodyne detection of multi-channel 1.0 Gbit/s/ch SD-WDM with a 12.5 GHz spacing.

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Time-domain interleaving technique for wavelength-swept light based super dense WDM transmitter

et al. 2009

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Multi-wavelength optical transmitter based on time-domain modulation of directly modulated wavelength-swept light

Cited by 7 publications

References 5 publications

Experimental demonstration of tolerance to FWM crosstalk in wavelength-swept WDM access systems

Experimental demonstration of tolerance to FWM crosstalk in wavelength-swept WDM access systems

Heterodyne detection of wavelength-swept super-dense WDM signal employing spectrum shaping

Time-domain interleaving technique for wavelength-swept light based super dense WDM transmitter

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