We propose and demonstrate a novel method for a radio-frequency photonic arbitrary waveform generator based on a tunable, multiwavelength pulse sequence and wavelength-to-time mapping induced by fiber chromatic dispersion. We simulate and experimentally demonstrate the generation of an arbitrary waveform and obtain burst single-tone, frequency modulation, and phase modulation signals. We also analyze the potential and primary limitations in the proposed architecture.
The impact on the performance of the direct-sequence optical code-division multiple-access (DS-OCDMA) system due to wavelength mismatch between encoder and decoder is investigated. Simulation results show that the encoder-decoder wavelength mismatch will degrade the bit-error-rate performance of the DS-OCDMA system drastically by decreasing the contrast ratio of the correctly and incorrectly decoded signals and lower data rate systems are more vulnerable to wavelength mismatch than higher data rate systems. In practical DS-OCDMA systems, the wavelength mismatch between encoder and decoder should be minimized, and some protective measures, such as temperature stabilization and fiber Bragg grating (FBG) packaging, should be taken to enhance the immunity of the superstructured FBG encoder/decoder to ambient conditions.
Influence of polarization drifts on a novel photonic ADC proposed was calculated theoretically and demonstrated through optical system simulation. A recently proposed polarization-drift free setup was established and it improves the performance of the device.
Wavelength tunable and ultra stable pulse generation at 10GHz is experimentally demonstrated using a non-PM, regeneratively mode-locked fiber ring laser. Less than 2.0 ps, nearly transform-limited, sech2-shaped pulses are directly generated with supermode noise suppression ratio over 70dB and RMS timing jitter value less than 162 fs. Dispersion management has been exploited in order to obtain the shortest pulse duration at 1.1ps. The mechanisms for the super-mode noise suppression are also discussed.
In this paper, an optical code division multiple access (OCDMA) system is demonstrated. The ultrashort light pulse is encoded and then decoded by amplitude sampled fiber Bragg gratings with equivalent phase shift (EPS). Compared with traditional superstructured fiber Bragg grating (SSFBG) with real phase shift (RPS), FBG with EPS is much easier to fabricate. In our experiment, it shows its full ability to perform encoding and decoding in OCDMA systems, and good encoding/decoding performance is achieved.
The performance of a spectral-phase-encoded (SPE) optical code-division multiple-access (OCDMA) system is analyzed. Regarding the incorrectly decoded signal (IDS) as a nonstationary random process, we derive a novel probability distribution for it. The probability distribution of the IDS is considered a chi-squared distribution with degrees of freedom r=1, which is more reasonable and accurate than in previous work. The bit error rate (BER) of an SPE OCDMA system under multiple-access interference is evaluated. Numerical results show that the system can sustain very low BER even when there are multiple simultaneous users, and as the code length becomes longer or the initial pulse becomes shorter, the system performs better.
Optical performance monitoring is a very import issue in the optical transparent network. We present an optical performance monitoring method, based on asynchronous sampling technology, and Q value and bit error rate can be calculated by the asynchronous histogram. Experiment result shows that the optical performance method is bit rate transparent and modulate format transparent.
In this paper, an interferometric autocorrelator based on two-photon-absorption (TPA) detector is demonstrated. It can be used in the measurement of ultrashort pulse at 1.55 um wavelength region. From the second order autocorrelation trace of optical field, we can infer the pulse width. Accompanied with a linear detector, we can fully characterize the optical pulse, including intensity and phase profiles. A novel phase retrieval algorithm is proposed. It is a combination of an iterative loop and an evolution process. Simulation results show that our algorithm converges stably and can give a
better approximation of the optical field than traditional algorithm.
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