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Research On Applications Of Semiconductor Optical Amplifier For Several Key Functions In Optical Networks

Posted on:2011-12-29Degree:DoctorType:Dissertation
Country:ChinaCandidate:F WangFull Text:PDF
GTID:1118360305992221Subject:Electronic Science and Technology
Abstract/Summary:PDF Full Text Request
The application of semiconductor optical amplifier (SOA) for three key functions in optical communications networks are investgatated, including optical source, optical switching nodes, integration of microwave and fiber technologies. A variety of fiber ring laser, all-optical clock recovery techniques, and all-optical ultrawideband (UWB) signal generation and modulation techniques are presented and demonstrated. Our research achievements and contributions are summarized as following:(1) A novel actively and passively mode-locked SOA fiber ring laser was presented and demonstrated, where SOA provided cavity gain and introduced nonlinear polarization rotation (NPR), whereas, intensity modulator not only acted as modulator but also polarizer. A fiber-ring laser incorporating dual mode-locking mechanisms is also presented and demonstrated, where a multi-quantum well (MQW) SOA acts as active loss modulator and a reflective SOA introduce NPR and function as a saturable absorber. In addition, we also demonstrate a fiber ring laser with a segment of dispersion compensation fiber and a delayed interferometer with temperature control, which is able to switch eleven wavelengths one by one.(2) We present and demonstrate a multi-wavelength mode-locked fiber ring laser incorporating a SOA and a Fabry-Perot semiconductor optical amplifier (FP-SOA), which can generate 19 synchronized wavelength channels with the extinction ratio of about 21 dB, each mode-locked at 10 GHz. We also demonstrate a multi-wavelength SOA fiber ring laser with a dual-pass Mach-Zehnder interferometer (MZI) filter, a stable 82 wavelengths with a wavelength spacing of 40 GHz simultaneous oscillate is acquired. In addition, a wavelength tunable and switchable single-longitudinal-mode dual-wavelength erbium-doped fiber laser using a dual-pass MZI comb filter is also presented and demonstrated.(3) All-optical clock recovery (AOCR) from 20 Gbit/s nonreturn-to-zero differential phase-shift-keying (NRZ-DPSK) signals are demonstrated experimentally by using a polarization-maintaining fiber loop mirror filter (PMF-LMF) and a SOA mode-locked fiber ring laser. In addition, we also report an AOCR technology with pulse-amplitude-equalization scheme using NPR of reflective SOA (RSOA).(4) We experimentally demonstrate a novel AOCR scheme for the RZ data with single-and multiwavelength. This scheme is mainly based on clock-like pulse generation from an active filter with a MQW FP-SOA and amplitude-equalization scheme with self-nonlinear polarization switching (SNPS). We also demonstrated the same scheme is used for AOCR from the input NRZ and NRZ-DPSK data without any preprocessing measures. In addition, we presented and demonstrated AOCR from the input RZ data with single-and multiwavelength, using a single MQW FP-SOA, without any additional amplitude equalization measure. The facets reflectivity of FP-SOA influence on amplitude equalization of recovered clock was numerically investigated.(5) We proposed and demonstrated an all-optical polarity-and shape-switchable UWB Gaussian pulses generation scheme using a single polarization interferometer (PI) or a SOA cascaded by a PI. Moreover, if a NRZ control signal is introduced into the SOA, utilizing cross-gain modulation (XGM) effect of the SOA, all-optical modulation to UWB signals can be realized. We also present and demonstrate an all-optical UWB Gaussian pulses generation and modulation scheme using a SOA cascaded by a DWDM.
Keywords/Search Tags:semiconductor optical amplifier, Fabry-Perot semiconductor, optical amplifier, fiber ring laser, all-optical clock recovery, all-optical ultrawideband signal generation, all-optical ultrawideband signal modulation
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