Dual polarization state phase modulation dpqpsk absolute phase and amplitude at the bit center 3d phase constellation diagram baud rate. Quadrature phaseshift keying qpsk sometimes this is known as quadriphase psk, 4psk, or 4qam. Dp qpsk is the short form of dual polarization quadrature phase shift keying. Experimental optical generation of 16qam modulation. Polarizationdivision multiplexing pdm is a physical layer method for multiplexing signals carried on electromagnetic waves, allowing two channels of information to be transmitted on the same carrier frequency by using waves of two orthogonal polarization states. Cd, polarizationmode dispersion pmd, and has a high spectral efficiency, and thus can be used in ultra long haul transmission as well. Bbs4 protocol by qpsk modulation using dualelectrode. Cn102638430b dp dualpolarizationqpsk quadrature phase. Optical modulation analyzer systems coherent solutions. Jun 17, 2019 the dual polarization quadrature phase shift keying dp qpsk is one of the most useful modulation techniques for the 100 gbs or higher bit rate transmission among all the multilevel modulation techniques. Subsequently performance and characteristics of 100 gbs pmqpsk systems are given focusing on its osnr sensitivity, filtering tolerance and dispersion. Which is the most powerefficient modulation format in optical. Polarization beamsplitter, two optical 90 hybrids and photodiodes are integrated on one chip. By combining qpsk partitioning, maximum likelihood ml detection and phase offset estimation between signals in different polarizations, simulation and experimental results for a 200gbs dp16qam system demonstrate similar linewidth tolerance to the best.
Jun 29, 20 an improved multiplierfree feedforward carrier phase estimation algorithm is proposed for dual polarization quadraturephaseshiftkeying dp qpsk with coherent detection. Ieee transactions on communications 1 dual polarized. Pdf performance of dualpolarization qpsk for optical transport. Pdf dualpolarization nfdm transmission with continuous. Analysis of performance for 100 gbits dualpolarization qpsk. An improved multiplierfree feedforward carrier phase estimation for dualpolarization qpsk modulation format.
By changing the dc bias phases of the modulator and the phase difference between the input rf signals, twohighorder ssb modulation signals are generated from the two qpsk modulators. The qpsk signal within a symbol duration is defined as. The figure3 depicts dp qpsk modulator block diagram. Optsim simulation of 40 and 100gbps polarizationmultiplexed qpsk systems highdensity optical systems operating at 40 and 100 gbps require advanced transmission schemes for accurate delivery of data over long reaches. A novel microwave waveform generator based on a dualpolarization quadrature phaseshiftkeying dp qpsk modulator is proposed and experimentally demonstrated in this paper. Introduction the simultaneous use of two polarizations is a means to increase the spectral efciency that is being explored for mobile satellite communications 1. In this paper, the comparison between advanced modulation schemes i.
Dp qpsk modulation uses two polarizations with the same original qpsk constellation to represent bits. Signals with this modulation format are used to transmit over 300 km of standardsingle mode fiber with an insertion loss of 63 db, using only counterdirectional. Dpqpsk modulation and coherent detection architectures. This standard uses dual polarization quadrature phase shift keying dpqpsk as modulation format, whose spectral efficiency is four times that associated with traditional onoff keying format ook, for optical transmission at physical layer. Osnr sensitivity analysis on a 100 gbs pmqpsk system. Quadrature phase shift keying qpsk and dual polarization quadrature phase shift keying dpqpsk is carried out on single mode optical fiber cable. Carrier phase shifts in a dual mz qpsk modulator hence, by mapping the input bits to the.
The invention relates to a dp dual polarization qpsk quadrature phase shift keying demodulator which serves as a photoelectronic module. Second, the performance of the device is evaluated in system experiments with 16qam and qpsk modulation up to 112 gbs. Spectral amplitude modulation for dualpolarization multisoliton. A polarization beam combiner pbc recombines the two signals at the output.
We show that dpmbofdm and dp qpsk have nearly the same performance at 100 gbps after transmission over a 10x100 km fiber line. Towards this end, coherent phase modulation technologies coupled with polarization multiplexing have been developed. The quadrature phase shift keying qpsk is a variation of bpsk, and it is also a double side band suppressed carrier dsbsc modulation scheme, which sends two bits of digital information at a time, called as bigits. Ieee transactions on communications 1 dual polarized modulation and reception for next generation mobile satellite communications pol henarejos, student member, ieee, and ana i. Transmission analysis of 112 gbps dual polarization qpsk 16qam using.
In the proposed link, 32 independent wavelength channels are multiplexed, each carrying 200 gbps dual polarizationquadrature phase shift keying dpqpsk data with 60 ghz channel spacing yield net transmission rate of 6. Ntt demonstrated a iiiv travelingwave inp iq modulator, which achieved 80gbs qpsk operation 8. Efficient modeling and simulation of wavelength division. Cd, polarization mode dispersion pmd, and has a high spectral efficiency, and thus can be used in ultra long haul transmission as well. Nonlinearitytolerant modulation formats for coherent optical. Pdf performance of dualpolarization qpsk for optical. At low frequencies, like land sband, only one polarization has been traditionally used.
Dp qpsk and dual polarization quadrature amplitude modulation dp 16 qam. Effects of homodyne crosstalk on dualpolarization qpsk signals. Dualpolarization qpsk dp qpsk transmission system based on the technology of coherent. Polarization division multiplexing pdm is a physical layer method for multiplexing signals carried on electromagnetic waves, allowing two channels of information to be transmitted on the same carrier frequency by using waves of two orthogonal polarization states. Phasesensitive amplification and regeneration of dual. These early systems used the intensity modulation of lasers and the. Nonlinearitytolerant modulation formats for coherent. Dpqpsk stands for dual polarization quadrature phase shift keying. This is a costeffective alternative to utilizing 16psk. Osa lowcomplexity and phase noise tolerant carrier phase. The first hwp is positioned to receive an output of the first pbs. Comparative analysis of qam and dpqpsk modulation techniques.
Dualpolarization qpsk demodulator finisar corporation. Modulation types and their constellation in the system of coordinates the modulation methods can be basically divided into different categories figure 2. Highdimensional modulation for coherent optical communications. Dual polarization nfdm transmission with continuous and discrete spectral modulation article pdf available in journal of lightwave technology pp99. Quadrature phase shift keying qpsk and dual polarization quadrature phase shift keying dp qpsk is carried out on single mode optical fiber cable. The dp qpsk dual polarization quadrature phase shift keying is a fiber optic digital modulation technique which uses two orthogonal polarization of a laser beam, with qpsk digital modulation on each polarization. Proposed method the proposed method is illustrated in fig. In this paper, we report on a novel modulation format exhibiting the same spectral bandwidth as dualpolarization dp bpsk, but with an improved osnr tolerance. The driver electronics for each mzi is simply 10g, giving a cost advantage over other 40g formats. Dualpolarization multiband ofdm versus singlecarrier dp. Dualpolarization quadrature phase shift keying dpqpsk or dualpolarization qpsk involves the polarization multiplexing of two different qpsk signals, thus improving the spectral efficiency by a factor of 2. Perezneira, senior member, ieee abstractthis paper presents the novel application of polarized modulation pmod for increasing the throughput in mobile.
Lowcomplexity and phase noise tolerant carrier phase. This article introduces modulation technology, coherent reception technology, the overall design and. An improved multiplierfree feedforward carrier phase. The method of claim 1, wherein the dualpolarization iqm modulator is used to transmit a single or dual polarization multilevel modulation format. Dual polarization quadrature phase shift keying dpqpsk or dual polarization qpsk involves the polarization multiplexing of two different qpsk signals, thus improving the spectral efficiency by a factor of 2. We study and compare the performance of 112gbs dual polarization coherent optical system for single channel coherent system with different modulation techniques,dp qpskdual polarization quadrature phase shift keying, dp16qamdual polarization 16 qadrature amplitude modulation using numerical simulations with inline dcfdispersion compensation fiber and without inline dcf but.
The x qpsk modulator is modulated by a local oscillator signal. An integrated dual polarization dp coherent receiver for quadrature phaseshift keying qpsk will be comprised of the following basic parts as shown in fig. Transmission analysis of 112 gbps dual polarization qpsk16qam. A novel microwave waveform generator based on a dualpolarization quadrature phaseshiftkeying dpqpsk modulator is proposed and experimentally demonstrated in this paper. The dpqpsk 100gbs modulator supports the generally accepted dual polarizationqpsk modulation scheme.
In dp qpsk, one symbol represents 4 bits in dp qpsk compare to 2 bits in qpsk. Advanced modulation format an overview sciencedirect. The proposed dualpolarization joint modulation schemes enables to exploit all the degrees of freedom for modulation both polarizations and both spectra provided by a singlemode. As an example of a higherorder modulation format iiiv device, a researchstage demonstration of a iiiv, singlechannel, advanced modulation format transmitter, an inp. The modulation techniques described in this paper as ndimensional require all. Dual polarization 16qam coherent transmission link. Differential quadrature phaseshiftkeying dqpsk format provides a promising alternative as it, like qpsk, transmits 2 bits per symbol and hence the symbol rate is half the bit rate with somewhat reduced complexity of the system. Effects of homodyne crosstalk on dualpolarization qpsk. A silicon based dualdrive nested mzm for qpsk modulation was firstly demonstrated at 20 gbits 7.
First, results of basic characterizations of the receiver are given. Phase shift keying presentation linkedin slideshare. A silicon based dual drive nested mzm for qpsk modulation was firstly demonstrated at 20 gbits 7. Osa lowcomplexity and phase noise tolerant carrier. Introduction even if coherent dual polarization quaternary phase shift keying dp qpsk is today the industrial solution for 100 gbps longhaul transport 1, coherent dual. Wavelength conversion of dpqpsk signals in a silicon. This page compares qpsk vs dp qpsk and mentions difference between qpsk and dp qpsk modulation types. Ieee proof ieee transactions on communications 1 dual polarized modulation and reception for next generation mobile satellite communications pol henarejos, student member, ieee, and ana i. An improved multiplierfree feedforward carrier phase estimation algorithm is proposed for dualpolarization quadraturephaseshiftkeying dpqpsk with coherent detection. We show that dpmbofdm and dpqpsk have nearly the same performance at 100 gbps after transmission over a 10x100 km fiber line. Jul 22, 2014 in an embodiment, a dpqpsk demodulator includes first, second and third polarization beam splitters pbss and first, second and third half waveplates hwps. Models are simulated for long distance communication and high data rates. All about modulation part i basic concepts, signal space, constellations and phase shift keying modulations psk, qpsk, oqpsk, mpsk. Dualpolarization qpsk dpqpsk transmission system based on the technology of coherent.
This is a costeffective alternative to utilizing 16psk, instead of qpsk to double the spectral efficiency. First experimental demonstration of a 3dimensional simplex. Since these modulation formats just use different parity bit expressions in the same constellation. This modulation technique is typically used in conjunction with coherent detection at the farend receiver. In an embodiment, a dpqpsk demodulator includes first, second and third polarization beam splitters pbss and first, second and third half waveplates hwps. In the proposed link, 32 independent wavelength channels are multiplexed, each carrying 200 gbps dual polarization quadrature phase shift keying dp qpsk data with 60 ghz channel spacing yield net transmission rate of 6.
This decreases the data bit rate to half, which allows space for the. Request pdf 112gbs monolithic pdm qpsk modulator in silicon we present a monolithic dual polarization quadrature phaseshift keying qpsk modulator based on a silicon photonic integrated. In addition, 16ary quadrature amplitude modulation 16qam with its higher spectral. Instead of the conversion of digital bits into a series of digital stream, it converts them into bit pairs. A higher modulation speed, 50 gbits qpsk, has also been. Dualpolarization nfdm transmission with continuous and. The method of claim 1, wherein the dual polarization iqm modulator is used to transmit a single or dual polarization multilevel modulation format.
Adding a second labmaster 1065zia acquisition module turns it into. According to one embodiment, the dpqpsk demodulator comprises a first polarization beam splitter pbs, a second pbs, a third pbs, a first halfwave plate hwp, a second hwp and a third hwp, wherein the first hwp is set to receive the output of the. However, a poor system constellation was achieved due to the low extinction ratio and unbalanced output optical power at the mzms. A novel microwave waveform generator based on a dual polarization quadrature phaseshiftkeying dp qpsk modulator is proposed and experimentally demonstrated in this paper. However, not much attention has been given for phasesensitive ps amplification of dualpolarization dp signals. Wavelength conversion of dpqpsk signals in a silicon polarization diversity circuit dragana vukovic, jochen schroeder, yunhong ding, mark d. By changing the dc bias phases of the modulator and the phase difference between the input rf signals, twohighorder ssb modulation signals are generated from the. Bbs4 protocol by qpsk modulation using dualelectrode mach. More recently, cogo demonstrated another inp iq modulator using a capacitively loaded travelingwave structure 9. By combining qpsk partitioning, maximum likelihood ml detection and phase offset estimation between signals in different polarizations, simulation and experimental results for a 200gbs dp16qam system demonstrate similar linewidth tolerance to the. Due to this, qpsk receiver is more complex compare to bpsk receiver due to four states needed to recover binary data information. A lowcomplexity feedforward carrier phase estimation cpe technique is presented for dualpolarization dp16qam transmission systems.
Application engineer lian zhao, principal engineer hari shankar. Qpsk vs dpqpsk difference between qpsk and dpqpsk modulation. Thereafter, the polarization multiplexing qpsk modulation is introduced, giving a short evolution on optical modulation and showing the main architecture of a pmqpsk transmitter. The dpqpsk dual polarization quadrature phase shift keying is a fiber optic digital modulation technique which uses two orthogonal polarization of a laser beam, with qpsk digital modulation on each polarization. Integration concepts for three types of dual polarization quadrature phase shift keying dpqpsk receivers were established, employing up to three etching depths of waveguide heights with different guiding and coupling properties hhi. The quadrature phase shift keying qpsk is a variation of bpsk, and it is also a double side band suppressed carrier dsbsc modulation scheme, which sends two bits of digital information at a time, called as bigits instead of the conversion of digital bits into a series of digital stream, it converts them into bit pairs.
Dual polarization dp quadrature phase shift keying qpsk operating at 100 gbs with receiver digital signal processing dsp are now commercially available 35. Performance of dualpolarization qpsk for optical transport systems article pdf available in journal of lightwave technology 2715 august 2009 with 1,775 reads how we measure reads. In quadrature phase shift keying modulation a sinusoidal waveform is. The xqpsk modulator is modulated by a local oscillator signal. Modulation types and their constellation in the system of coordinates the modulation methods can. Performance of dualpolarization qpsk for optical transport. Therefore, the four possible initial signal phases are and radians. Qpsk modulation and demodulation with matlab and python. Aug 19, 2015 quadrature phaseshift keying qpsk sometimes this is known as quadriphase psk, 4psk, or 4qam. Powerefficient modulation formats in coherent transmission systems. Efficient precoding scheme for dualpolarization multi. However, not much attention has been given for phasesensitive ps amplification of dual polarization dp signals. Dp qpsk stands for dual polarization quadrature phase shift keying. Performance of dualpolarization qpsk for optical transport systems.
Qpsk is a form of phase modulation technique, in which two information bits combined as one symbol are modulated at once, selecting one of the four possible carrier phase shift states. First experimental demonstration of a 3dimensional. Iteeperformance analysis and comparison of qpsk and dpqpsk. It is a fiber optic digital modulation technique which uses two orthogonal.
Photonic generation of microwave waveforms based on a dual. The dual polarization quadrature phase shift keying dpqpsk is one of the most useful modulation techniques for the 100 gbs or higher bit rate transmission among all the multilevel modulation techniques. Zehnder modulator mzm, odd sidebands are eliminated. Pll or other techniques, but the baudrates 1032 gbaud at which. Introduction even if coherent dualpolarization quaternary phase shift keying dpqpsk is today the industrial solution for 100 gbps longhaul transport 1, coherent dual. The research and development in optical fiber communication systems were started in the beginning of 1970s. A lowcomplexity feedforward carrier phase estimation cpe technique is presented for dual polarization dp16qam transmission systems. The mathematical analysis shows that qpsk can be used either to double the data rate compared with a bpsk system while maintaining the same bandwidth of the signal, or to maintain the datarate of bpsk but halving the bandwidth needed.
For xi machzehnder modulator mzm, odd sidebands are eliminated. Dualquadrature coherent receiver for 100g ethernet. Time skew estimator for dualpolarization qam transmitters. Iteeperformance analysis and comparison of qpsk and dp.
In this paper, we report on a novel modulation format exhibiting the same spectral bandwidth as dual polarization dp bpsk, but with an improved osnr tolerance. Advanced modulation format an overview sciencedirect topics. A 25gbaud inp dualpolarization, dual quadrature coherent receiver is shown in figure 2. It is used in microwave links such as satellite television downlinks to double the bandwidth by using two orthogonally polarized. This pic contains onchip polarization beam splitters pbss that separate the signal and lo into two polarizations. Thus, different nonlinearity compensation techniques such as digital backpropaga. Ps amplification of dp signals has been achieved by polarization diversity schemes 3 with increased complexity of the. The method of claim 12, wherein the single or dual polarization multilevel modulation format comprises binary phase shift keying bpsk, quadrature phase shift keying qpsk, 8 qam, or 16. Dqpsk is tolerant to chromatic dispersion cd, polarization mode dispersion pmd, and has a. In qpsk modulation technique, one complex symbol represents two binary bits. Study of qpsk, bpsk, dpqpsk and pdm semantic scholar. The second pbs is positioned to receive an output of the first hwp. First qpsk receivers with deeplyetched waveguides needed for compact design have also been fabricated.
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