In this paper we describe a multiple-access protocol in which different users are assumed to share the same bandwidth and the same pulse. Users employ the same modulation (binary-phase shift keying, quadrature-phase shift keying, and rectangular-phase shift keying are considered) with different transmitted magnitude, and are discriminated on the basis of the corresponding magnitude at receiver ...

We propose and demonstrate that periodically poled lithium niobate (PPLN) can act as an ultrafast three-input XOR gate for differential phase-shift keying (DPSK) signals based on cascaded sum- and difference-frequency generation. PPLN-based all-optical three-input Boolean XOR operations for 20 Gbits/s return-to-zero DPSK (RZ-DPSK), 40 Gbits/s RZ-DPSK, and 20 Gbits/s non-return-to-zero DPSK sign...

We propose and theoretically demonstrate the application of a specific coded modulation technique called as the Trellis Coded Modulation (TCM) to optical multilevel Differential Phase Shift Keying (DPSK) systems. In the process of identifying receiver structures for optical DPSK systems with coded modulation, it was discovered that though the parallel outputs from delay interferometer based opt...

Silicon microring resonators are proposed to achieve ultrasmall differential quadrature phase-shift keying modulators and demodulators operated at 20 Gb/s, which may require a dramatically reduced chip size. The modulators are characterized in terms of the carrier transit time and misalignment of the driving signals, while the demodulation performance is analyzed in terms of the bandwidth and f...

Coherent detection in combination with digital signal processing has recently enabled significant progress in the capacity of optical communications systems. This improvement has enabled detection of optimum constellations for optical signals in four dimensions. In this paper, we propose and investigate an algorithm for the blind adaptive equalization of one such modulation format: polarization...

A phase sensitive amplification (PSA) regeneration model for M-ary shift keying (MPSK) signals with amplified spontaneous emission (ASE) noise based on the interference between signal and its (M+1)th harmonic is proposed. Compared existing models different combinations of harmonics, new optimal in theory to deal MPSK degraded by ASE noise. The QPSK format taken as an example simulation verifica...

Incoherent detection based on differential encoding has been successfully applied to phase-shift-keying (PSK) signals because it eliminates the need for carrier phase acquisition and tracking at the receiver. This paper generalizes the idea of differential encoding by using a nonlinear transformation called multilag high-order instantaneous moment (ml-HIM). The ml-HIM decoder is capable of remo...

A continuous phase modulation (CPM) implementation alternative of a recently standardized class of Feher-patented quadrature phase-shift keying (FQPSK-B) modulation is proposed. It is based on the fact that FQPSK-B signal has quasi-constant amplitude and continuous phase characteristics, allowing CPM interpretation. Based on this, we derive the modulation index, premodulation filter and alterna...

Binary Phase Shift Keying (BPSK) is a promising modulation format for downlink data transmission in inductive biomedical telemetry systems, because it achieves high data rates and power efficiencies and requires simple electronics. In this paper, the Bit Error Rate (BER) performance of a BPSK biomedical telemetry system is investigated under Additive White Gaussian Noise (AWGN) and is found to ...

In this paper, we generalize a differential detection technique, which was introduced in [1] for a Gaussian Minimum Shift Keying (GMSK) scheme, to include any Correlative Encoded Continous Phase Modulated (CECPM) signalling format. Similarly to [1], the proposed symbol-by-symbol receivers employ decision feedback to partially remove the effects of the destructive Inter-Symbol-Interference (lSI)...