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Coherent synthesis of a complex modulated signal is achieved by simultaneously injection locking two directly-modulated semiconductor lasers. Better modulation linearity and comparable performance to LiNbO3 I-Q modulator is demonstrated.
We demonstrate generation of coherent optical OFDM signals using direct modulation of two injection locked lasers. Comparable performance to a LiNbO3 IQ modulator is achieved after 230-km transmission with coherent reception and standard DSP.
We demonstrate an innovative scheme for data-rate agnostic, wavelength-agile and real-time carrier recovery of carrier-suppressed PSK signals. Sub-Hz frequency tracking of the extracted carrier from a 21.5Gbit/s BPSK signal is demonstrated.
We review recent results on the regeneration of phase encoded (BPSK, QPSK) signals and discuss paths towards regeneration of amplitude/phase encoded (QAM) signals. Regeneration based on phase sensitive amplification will be discussed in detail.
We propose and numerically demonstrate a packet compression scheme based on re-coding of complex modulation formats through the use of a delay line interferometer (DLI) followed by a temporal gate. A variety of modulation formats can be accommodated and high compression factors can be obtained by using multiple DLIs to achieve higher order modulation formats.
We experimentally study passive coherent optical addition of complex modulation formats using delay line interferometers to increase their bits per symbol and, thus, their spectral efficiency. Two possible applications are demonstrated as examples.
We utilise cascaded four wave mixing to multiply the modulation depth of a phase-only optical signal and generate a comb of phase locked local oscillators allowing homodyne retrieval of the phase information with enhanced fidelity.
The performance of future ultralong-haul communication systems exploiting phase-encoded signals is likely to be compromised by nonlinear phase noise generated during signal transmission. One potential way to mitigate against nonlinear phase noise is to use phase-sensitive amplifiers (PSAs) that have been demonstrated to help remove such phase noise as well as to provide simultaneous signal amplitude...
Practical issues in pump phase synchronization necessary for coherent all-optical processing are discussed, including feed-forward carrier recovery of phase encoded signals.
A technique that allows the all-optical quantization of M-PSK signals using a parametric mixing process is discussed, including recent experimental demonstrations of high baud rate QPSK regeneration, and issues regarding future scalability of the scheme.
We discuss the application of phase sensitive fiber optical parametric devices for the processing and quantization of optical phase including recent experimental demonstrations.
We discuss the application of phase sensitive fiber optical parametric devices for the regenerative processing of high baud rate optical signals. We present recent advances in phase-sensitive amplification technology and its application to the regeneration of phase-encoded signals. By combining four wave mixing based parametric effects in highly nonlinear optical fibers and injection locking assisted...
We present recent advances in phase-sensitive amplification technology and its application to the regeneration of phase-encoded signals. Using a combination of parametric effects in fibers and optical injection locking of lasers, it is possible to observe phase regeneration in signals with multiple levels of phase encoding.
Phase noise introduced during transmission both from optical amplifiers and nonlinear interactions between channels represents a significant limiting factor to data transmission when advanced modulation formats such as (differential) phase-shift keying, (D)PSK, or quadrature phase shift keying, QPSK, signals are used to increase the network capacity [1]. Consequently, the development of all-optical...
Carrier recovery based on four-wave mixing and intra-band RF frequency division is evaluated in real time. We demonstrate <1Hz frequency tracking of a semiconductor laser and carrier extraction from a dispersed 20 Gbit/s BPSK signal.
We experimentally demonstrate phase-sensitive amplification in a highly nonlinear lead-silicate W-type fibre. A phase-sensitive gain swing of 6dB was observed in a 1.56m sample of the fibre for a total launched power of 33dBm.
We demonstrate the inherent suitability of fiber optical parametric amplifiers (FOPAs) to the amplification of optical combs, combining gain, spectral shaping, frequency translation, effective spectral broadening and low noise amplification.
We demonstrate all-optical 1-to-5 differential phase-shift keyed (DPSK) wavelength multicasting at 40 Gbit/s using a degenerate four-wave mixing (FWM) based phase sensitive amplifier (PSA). Phase regenerative properties are reported with a sensitivity improvement of more that 10 dB.
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