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- W2103907492 abstract "We compare three different differential quadrature phase-shift keying (DQPSK) transmitters: One with parallel Mach-Zehnder modulators (MZM), one with a MZM and a phase modulator (PM) in series and a new one with a single PM. Although they all generate optical DQPSK signals, it turns out that their performance differs with respect to bit error probabilities, chromatic dispersion and nonlinearity tolerance for nonrectangular impulse shaping. I. I NTRODUCTION Differential quadrature phase-shift keying (DQPSK) is a quaternary phase modulation format (1) which has recently been attracting attention because of its greater spectral e ffi- ciency compared to binary formats such as intensity modu- lation (IM) or differential binary phase-shift keying (DPS K) (2). As a quaternary format, DQPSK transmits 2 bit/symbol as opposed to only 1 bit/symbol for the binary formats. Different DQPSK transmitters have been proposed (1) (3). We compare the performance of three different DQPSK transmitters (TX) at bit rate Rb = 40 Gbit/s with respect to bit error probabilites (BEP), chromatic dispersion (CD) tolerance and nonlinearity tolerance with computer simulations." @default.
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- W2103907492 date "2004-11-13" @default.
- W2103907492 modified "2023-09-26" @default.
- W2103907492 title "Comparison of different DQPSK transmitters with NRZ and RZ impulse shaping" @default.
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- W2103907492 doi "https://doi.org/10.1109/admf.2004.1321694" @default.
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