Numerical comparison of NRZ, CS-RZ and IM-DPSK formats in 43 Gbit/s WDM transmission

Vassilieva, Olga; Hoshida, Takeshi; Choudhary, S.; Castañón, Gerardo; Kuwahara, H.; Terahara, T.; Onaka, H.

doi:10.1109/leos.2001.968993

Cited by 14 publications

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“…89) What is particularly interesting here is the fact that the advanced modulation formats developed in the field of microwave technology are being applied in a practical manner to the fiber-optical transmission of digital signals currently. 90) The phase shift keying techniques are good examples. This recent trend has been supported by the continuous development of integrated high speed LN modulators.…”

Section: Fusion Of Optical and Microwave Technologiesmentioning

confidence: 99%

Progress in Ultrafast Photonics

Kamiya

Tsuchiya

2005

Jpn. J. Appl. Phys.

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Recent progress in ultrafast photonics is reviewed with special emphasis on the research and development activities in Japanese research institutions in the field of optical communication and related measurement technologies. After summarizing the physical natures of ultrashort optical pulses, selected topics are reviewed on such as (1) ultrahigh-bit-rate optical communication employing the combination of optical time division multiplexing (OTDM) and wavelength division multiplexing (WDM), (2) optical components for ultrafast photonics with emphasis on all optical switches including semiconductor optical amplifiers, cascaded second order frequency converters, semiconductor saturable absorber switches, organic dye saturable absorber switches and bistable semiconductor lasers, (3) microwave photonics, emphasizing millimeter-wave/photonic communication technologies, and (4) high-speed optical measurements featuring both compact femtosecond pulse source development and rf magnetic field imaging. Some comments on the future prospect of ultrafast photonics are also given. It is concluded that in order to bring the powerful and versatile capability of ultrafast photonics into the real world, further collaboration between photonics specialists and production engineers/information specialists is strongly desired.

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Section: Fusion Of Optical and Microwave Technologiesmentioning

confidence: 99%

Progress in Ultrafast Photonics

Kamiya

Tsuchiya

2005

Jpn. J. Appl. Phys.

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“…A large dispersion effect produces the overlapping of pulses thus broadening the spectrum. This overlapping of pulses produce intra channel interference [7]. …”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of 16 Channel WDM System with Modulation Formats

Singh¹

2018

IJRASET

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I.INTRODUCTION RZ modulation is superior to NRZ signal in many respect. Firstly, it can reduce the intra-channel nonlinear effect. Secondly, it is helpful in combating FWM and XPM when these pulses are overlapping in time domain. Lastly, it is also reducing the inter channel nonlinear effects as compared with NRZ systems [1].RZ signal pulse width is much smaller than NRZ signal pulse width. Due to this reason, NRZ pulses with different wavelengths take much longer time to reach from one place to another than NRZ pulses. Due to this longer duration of pulses, a chance of producing FWM & XPM is increased. This is the reason that NRZ modulation format pulses are vulnerable to inter-channel nonlinear effects [2,3]. However, for combating with linear cross talks amongst different channels, NRZ signal is superior due to their much narrower bandwidth as compared to RZ signal [4]. But, with the proper use of spectral filtering i.e. properly shaping the pulse at the transmitter, the unwanted components with high frequency can be removed and thus minimizing the linear cross talk among different channels in RZ system. This further enables popularity of RZ system over NRZ system [5]. It is obvious that RZ format is much more superior than NRZ modulation format due to its numerous advantages as discussed above. But, performance of RZ systems is limited due to intra channel impairments produced due to interaction of nonlinearity and dispersion. So, to improve RZ system performance this impairment should be minimized. However, these sources and mechanism which can degrade system performance due to inter channel and intra channel are studied [6]. A large dispersion effect produces the overlapping of pulses thus broadening the spectrum. This overlapping of pulses produce intra channel interference [7].

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“…Balanced detection of DPSK signals offers a 3-dB improvement in receiver sensitivity over direct detection of on-off keying signals 1,2 . DPSK signals also exhibit enhanced tolerance to fiber nonlinearity, particularly the effects of inter-channel cross-phase modulation (XPM) 3,4 . These properties allow DPSK signals to be transmitted over extensive distances without regeneration.…”

Section: Introductionmentioning

confidence: 99%

All-optical regeneration of differential phase-shift keyed signals based on phase-sensitive amplification

Croussore

Kim

2005

SPIE Proceedings

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All-optical regeneration of differential phase-shift keyed signals based on phase-sensitive amplification in a nonlinear fiber Sagnac interferometer is described. Nearly ideal phase regeneration can be achieved in the undepleted pump regime, with output differential phase noise limited only by fast fluctuations of the pump phase relative to the DPSK signal. Operating in the depleted pump regime offers the possibility of simultaneously regenerating both phase and amplitude information of DPSK signals while providing low noise, phase-sensitive gain.

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Numerical comparison of NRZ, CS-RZ and IM-DPSK formats in 43 Gbit/s WDM transmission

Cited by 14 publications

References 0 publications

Progress in Ultrafast Photonics

Progress in Ultrafast Photonics

Performance Analysis of 16 Channel WDM System with Modulation Formats

All-optical regeneration of differential phase-shift keyed signals based on phase-sensitive amplification

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