Photonic millimeter wave (mm-wave) signal generation employing a differential Mach-Zehnder modulator (DMZM) and
a semiconductor optical amplifier (SOA) is proposed and evaluated by simulations. Optimization design and
performance analysis of the scheme are conducted via simulations. This paper presents the theoretical study of the
generation of copolarized dual-pump with locked phase and optical mm-wave signal, the propagation of the optical mm-wave
signal in single mode fiber (SMF). The effect of SOA and the input optical signal on the mm-wave generation and
transmission is investigated by means simulations. Simulation results present useful insights for the practicality of
photonic mm-wave signal generation and distribution in the next-generation access network.
KEYWORDS: Upconversion, Modulation, Four wave mixing, Semiconductor optical amplifiers, Frequency conversion, Radio optics, Optical engineering, Extremely high frequency, Radio over Fiber, Transparency
A novel scheme of photonic frequency conversion based on two-pump four-wave mixing in a semiconductor optical amplifier is proposed. Characterized by its wide conversion range, the proposed scheme has the potential to generate millimeter waves at much higher frequency and convert several signal channels simultaneously. The system performance is analyzed through a numerical model, and the effect of the pump-signal pulse parameters on the conversion efficiency is discussed.
Proposed in this paper is a high efficient 160Gb/s all-optical wavelength converter based on terahertz optical asymmetric demultiplexer with quantum dot Semiconductor optical amplifier (QDSOA -TOAD). The performance of the wavelength converter under various operating conditions, such as different injected current densities, input pulse widths and input control pulse energies, is analyzed in terms of contrast ratio (CR) through numerical simulations. With the properly chosen parameters, a
wavelength-converted signal with CR over 19.48 can be obtained.
By using thin membrane plating technology in collimating lens, we successfully manufacture a 16×10Gbit/s multiplexer
basing on the combination of fiber and space structure method. The multiplexer is flexible according to your practical
need that can output 20, 40, 80, or 160Gbit/s signal. For 20, 40, 80 or 160Gbit/s multiplexer, insertion loss is 3.5dB, 7dB,
10.5dB and 14dB respectively. The low insertion loss provides maximum transmission power. It also has such features:
high time-delay accuracy, polarization insensitivity, broadband, very short coherence length, high time-delay accuracy,
and excellent temperature stability. It differs from the structure of general Mach-Zehnder interferometer. It has the
structure of Michelson interferometer.
In this paper, a novel scheme utilizing the dual-pump FWM in SOA is proposed for the frequency up-conversion and the generation of
mm-wave. Characterized by its large conversion range, the proposed scheme has the potential to generate mm-wave at much higher frequency and to convert several signal channels simultaneously. Performance of the system is analyzed through a numerical model and the impact of the pumps power on the conversion efficiency is discussed.
Based on rate equations for carrier density in the active region of the QDSOA, the performance of a XOR gate using a quantum-dot semiconductor optical amplifier- based Mach-Zehnder interferometer (QDSOA-MZI) is analyzed in terms of Q factor through numerical simulations. The control pulse energy, the pulse width and the carrier capture time from the wetting layer into the dots are examined, which prove to be relevant to the Q factor. Our numerical results show that at 160Gb/s a high quality output signal with a Q factor over 5.9dB can be achieved.
Introduced in this paper is an experimental system of packet-level self-synchronization using semiconductor optical
amplifier based Mach-Zehnder interferometer (SOA-MZI). The function of SOA-MZI in the system is analyzed, as well
as the relationship among key parameters of various components. A tunable optical delay line is used for the adjustment
of phase difference. It reveals that SOA-MZI is an effective way to extract self-synchronization clock in both
experiments and practical applications.
One time division multiplexer based on half-reflective coating lens as beam splitter/combiner and fiber length to control relative time delay between two channels was demonstrated and experimentally studied in detail. This time-division multiplexer is a serial structure with four stages, and a pulse stream with sixteen times repetition rate can be achieved with the multiplexers. Its characteristics including polarization properties were experimentally studied in 16×10 Gb/s optical signal generation system.
The simple structure of a tunable polarization mode dispersion (PMD) compensator based on a cantilever beam and a high-birefringence linearly chirped fiber Bragg grating is proposed. A cantilever structure is used to introduce a linear strain gradient on the grating, and we can tune the compensated differential group delay (DGD) at a fixed signal wavelength just by changing the displacement at the free end of the beam. Based on numerical simulations, the performance of the cantilever structure as a PMD compensator is assessed for 10-Gbits/s nonreturn-to-zero transmission systems with a large DGD. With this compensator, a significant improvement of system performance can be achieved in the eye pattern of a received signal.
In this paper, we introduced a novel method to fabricate 40Gbit/s optical time division multiplexer by using PZT to modify the length of fiber, and investigated its polarization sensitivity. Optical fiber couplers were sensitive to polarization. Their coupling ratio changed with the fluctuation of polarization state, so the output power of multiplexer fluctuated. Polarization scrambler was adopted to reduce the polarization sensitivity of OTDM system for the first time and its validity was testified by the experiment.
We report on a 40 Gbit/s NRZ (non-return-to-zero) code transmission experiments including an dynamic Polarization mode dispersion (PMD) compensation. The dynamic PMD compensator is made up of two-stage four degrees. The first stage adopts polarization controller and fixed time-delayed line. The second stage is variable Differential Group Delay (DGD) element. The PMD monitoring technique is based on degree of polarization (DOP) as error signal. A novel practical adaptive optimization algorithm was introduced in dynamic adaptive PMD compensation. The experimental results show that the performance of the PMD compensator is excellent for 40Gbits/s NRZ transmission systems with the large the DGD. With this compensator, a significant improvement of system performance can be achieved in the eye pattern of a received signal.
Dynamic programming, the ordinary adaptive compensation in the operational research, is used to resolve extremum of functions under the constraint condition. In this paper, it is introduced that, fundamentals, methods and steps about the first-order PMD compensation by dynamic programming. The result shows that, for the first-order PMD compensation, dynamic programming is used to carry out optimized design, and the result is satisfied. Beginning with recursive relation of PMD vectors in the fiber and the compensation devices, mathematical model of the first-order PMD compensation is established. Through optimized algorithm using dynamic programming, simulation and experiment for PMD adaptive compensation are both implemented. Some optimized algorithms once used in the PMD adaptive compensation have slow speed to approximate the optimal value and tends to become the local optimal solution; but if optimized algorithm using dynamic programming can approximate the global optimal solution directly. Therefore, it has the advantage of fast optimized speed. On this basis, the image of optimal solution is given and analyzed. PMD compensation scheme, based on PMD compensation vector, is proposed. The algorithm principle of adjusting control and the direction of improvement are also put forward. These results are benefit for dynamic adaptive compensation of PMD.
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