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A fiber loop with an internal frequency shifter is used to produce the delayed copies of an incoming data signal. The linear phase response of the system is verified and the spurious free dynamic range (SFDR) is measured. Also, the BER and constellation diagrams of 10Gbaud QPSK signals are obtained.
We experimentally demonstrate an arbitrary optical higher order QAM generation using single stage nonlinear element and Kerr frequency comb. We successfully generated 80-Gbit/s 16-QAM and 120Gbit/s 64-QAM at EVM of 6.5% and 5.5% by multiplexing two and three 40-Gbit/s QPSK signals, respectively.
A tunable all-optical inter-channel interference mitigation method is proposed for an overlapped channel system that avoids the need for multi-channel detection. We experimentally demonstrate the system performance improvement for 16QAM and QPSK overlapped channels for both 20/25 Gbaud data and under different channel spacing conditions.
A tunable optical channel slicing and stitching scheme is experimentally demonstrated in QPSK/16QAM systems. Its application to dynamic bandwidth allocation in WDM channels brings >6dB OSNR improvement at 1e-3 BER comparing to direct channel insertion.
We experimentally demonstrate tunable all-optical simultaneous de-aggregation of multiple wavelength 16-QAM channels into two 4-PAM channels using a single stage nonlinear element. Tunability of the proposed approach over modulation format and bitrate is shown by de-aggregation of multiple channels for 10/15-Gbaud QPSK signals into two BPSK signals.
The performance of a black-box Raman-assisted PSA amplifier is experimentally evaluated. In a 20-Gbaud QPSK system, more than 25dB net gain is demonstrated. Comparing to a 4dB-noise-figure EDFA, ∼1.5dB ASE noise level reduction is observed.
We experimentally demonstrate a tunable simultaneous ROADM with crosstalk reduction using optical nonlinear elements in spectrally overlapped 20–25 Gbaud QPSK WDM channels. OSNR gain of 5 dB shows the effectiveness of the approach.
We experimentally de-aggregate the 16-QAM signal (EVM 6.9%) onto two 4-PAM signals (EVM 8.5%). Tunability of the approach over modulation format and bit rate is also shown by de-aggregating QPSK signals at two different baud rates.
An optical inter-channel interference mitigation approach for wavelength-overlapped channels with combinations of different baud rates and pulse shapes is experimentally demonstrated. The robustness of this approach is verified by OSNR improvements under distinct system configurations.
A cascaded configuration of Parametric Amplifiers (PA) using distributed Raman amplification is proposed to selectively extract either of QPSK channels in a WDM system. Wavelength selectivity is obtained by changing PA pump wavelength and phase.
We demonstrate an optical multiplexing and transmission of QPSK-to-16QAM channels over 100 km using wave mixing for aggregation and noise mitigation. For the input signals with phase noise of ∼50, 35 degree and 300 MHz noise bandwidth, the OSNR penalty of ∼1dB is obtained at BER 10–3 for aggregated 20 Gbaud 16QAM signal compared to the case of having no phase noise in input signals.
We experimentally characterize the spurious-free dynamic range performance of a χ2-Based PPLN waveguide by measuring the distortion on a microwave photonic link of two RF tones around 9.9GHz and characterizing the SFDR of a generated idler in a PPLN waveguide
We demonstrate the analog performance of multiple, coherent, and discretely tunable time delays based on a frequency comb and a chromatic dispersion element. The amount of 0.6ns delay is measured between adjacent selected comb lines. The linear phase frequency response of the system is verified and the SFDR is measured.
A Raman-assisted PSA scheme is proposed with the phase matching condition achieved by PSA pump wavelength tuning. More than 10dB signal gain and 2dB sensitivity improvement are experimentally demonstrated by a typical 20G-baud QPSK system.
We experimentally demonstrate all-optical phase-sensitive regeneration of a 10–20Gb/s BPSK signal without a phase-locked loop by amplifying the idler using Brillouin amplification. Phase noise reduction of up to 56% along with 11dB gain at BER of 10−5 were observed.
A scheme of automatically phase-locked self-homodyne detection with a low-power pilot-tone is proposed. The performance is experimentally demonstrated by back-to-back 10/20-Gbaud BPSK, 10-Gbaud QPSK and 100km-transmission of 10-Gbaud BPSK with pilot-to-signal power ratio of −30dB.
A Brillouin probing method is proposed to extract the distribution of signal power along phase-sensitive parametric amplifiers. Operation near the zero-dispersion-wavelength shows enhanced sensitivity to dispersion fluctuations, allowing effective extraction of the dispersion map.
A method to measure the signal power evolution along phase-sensitive parametric amplifiers is proposed using Brillouin optical time-domain analysis. Different evolutions along the fiber are reported by varying input wave phases, including amplification and de-amplification.
The performance of devices based on highly nonlinear fibers (HNLF) can be drastically impeded by even tiny fluctuations of the zero dispersion wavelength (ZDW) along the fiber. Being able to measure ZDW fluctuations along an HNLF is therefore essential for the design of efficient nonlinear optics based devices such as fiber optical parametric amplifiers (FOPA), regenerators and limiters. Different...
A simple analytic formula is derived to extract tiny dispersion fluctuations along highly nonlinear fibers from distributed measurements of parametric gain. A refined BOTDA scheme, suitable to track Kerr processes, enables low noise measurements.
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