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We discuss a technique that allows for flexible synthesis of square QAM constellations via the direct modulation of tunable, injection locked, semiconductor lasers. The approach uses optical coherent multiplexing and we demonstrate full C-band tuning.
BPSK modulation tunable over 30 nm is obtained, highlighting the practicality of a recently-demonstrated new scheme for direct synthesis of phase and amplitude modulated signals. Experiments are carried out at 12 and 24 Gbit/s.
A new scheme for direct and tunable (30nm shown here) QAM synthesis from binary RF data streams is demonstrated with up to 48Gbit/s QPSK, including propagation over 75km SMF-28. Preliminary 16QAM (60Gbit/s) results are shown.
A new scheme for direct synthesis of QAM (4,16,64,..) from binary RF data streams is suggested and tested by generating 10 Gbaud QPSK. Current semiconductor lasers should allow for operation up to 160 Gbaud.
We utilize four wave mixing to precisely multiply the modulation depth of a phase encoded signal, demonstrating 3-extra effective bits of resolution at 32GHz. The technique enables a new class of optical signal processing functions.
We report the first field-trial of a phase and amplitude regenerator highlighting the practicality of the technology. Sensitivity improvement and mitigation of transmission-induced noise with the regenerator placed in-line or at the receiver is demonstrated.
More compact, stable, and efficient configuration of a recently-developed regenerator is presented. The regenerator is assessed at data rates up to 56 Gbit/s using white phase noise for the first time.
We introduce a novel input-idler-free non-degenerate phase sensitive amplifier (PSA) configuration and use it for simultaneous phase and amplitude regeneration of quadrature phase shift keyed (QPSK) signals demonstrated at symbol rates up to 56 Gbaud.
We propose and experimentally demonstrate a novel scheme of phase-sensitive wavelength conversion, based on a combination of cascaded second-order nonlinear effects in two cascaded periodically poled lithium niobate waveguides.
We discuss recent advances in phase-sensitive amplification technology and review its application to the regeneration of multi-level phase-encoded signals.
We experimentally study the pure amplitude and phase regeneration capabilities of a black-box degenerate four wave mixing (FWM) based bit-rate-flexible phase sensitive amplifier (PSA) for a 40 Gbit/s differential phase-shift keyed (DPSK) signal.
We propose a novel black-box optical phase sensitive amplifier (PSA) configuration and describe its application to the regeneration of multi-level phase encoded signals. The concept is demonstrated with a 10 Gbaud quadrature phase shift keyed (QPSK) input.
We experimentally study saturation effects in degenerate phase sensitive amplifiers, revealing and explaining a gain regime suitable for all-optical signal processing functions such as phase regeneration.
We propose and experimentally demonstrate a new all-optical technique for the generation of two optical pumps with oppositely varying carrier phases for mitigating SBS in parametric amplifiers without phase-dither transfer from pumps to signal.
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