An in-fibre temperature sensor based on a novel dual-mode fibre is proposed and experimentally characterized. The sensor head uses an in-fibre Mach-Zehnder(MZ) structure to sense the surrounding temperature, which depends on the interference spectrums. The concentric multilayer-core fibre (CMCF), in which only two modes could be propagated, would be easier to fabricate an in-fibre MZI with clean spectrum than many fibres, such as multimode fibres, thin-core fibres, PCFs and et al. And low-loss high-strength splice between CMCF and conventional single-mode fibre can be implemented with a commercial fusion splicer. Both the propagation characteristics and operation principle of such a sensor are demonstrated in detail. A sensitivity of ~50.13 pm/°C within temperature range of 30–70 ℃ are experimentally achieved, respectively.
The simultaneous wavelength exchange and 2R regeneration between two degraded optical time division multiplexing (OTDM) signals is experimentally demonstrated. By exploiting the self-phase modulation effect and offset filtering in a single highly nonlinear fiber (HNLF), it achieves 2R optical regeneration. Meanwhile, it realizes wavelength exchange using a bidirectional configuration. Optical wavelength exchange and 2R of 20- and 50-Gbit/s OOK signals at 1557.3 and 1552.3 nm is implemented with a power penalty of ∼0.5 dB at a bit-error rate of 10−9. The results show that the crosstalk is negligible for both channels in opposite directions. This bidirectional configuration exhibits excellent performance for simultaneous wavelength exchange and 2R regeneration between two degraded OTDM signals with different wavelengths.
In this paper, we experimentally demonstrate simultaneously all-optical optical time division multiplexing (OTDM) add-drop multiplexing (ADM) operation of two 80-Gbit/s OTDM signals by using a single highly nonlinear fiber (HNLF). The performance of ADM is experimental studied. The experimental results show that only a power penalty of 1.5dB for the channel dropping function and no distinct power penalty for the adding function.
This study analyzes a photonic ultrawideband pulse generator by using a dual-parallel Mach-Zehnder modulator. A simple configuration capable of generating two popular types of ultrawideband pulse shape, Gaussian monocycle and doublet, is proposed. The generated ultrawideband pulses have very high quality, and the exact waveform is tunable with respect to parameter settings. By changing the time delay between two-path driving pulses applied to the upper and lower sub-Mach-Zehnder modulator of the dual-parallel Mach-Zehnder modulator, the generated ultrawideband pulses can be switched from Gaussian monocycle to doublet. The proposal is first analyzed and then validated by simulations. Results of the study demonstrate that it can offer a realistic solution to photonic ultrawideband pulse generation.
One 160 Gb/s optical time division demultiplexer based on two cascaded electro-absorption modulators
as sampling windows was demonstrated and experimentally studied in detail. The two stages were used
for the 160 Gb/s into 40 Gb/s demultiplexing and 40 Gb/s into 10 Gb/s demultiplexing respectively.
In this letter, a tunable chromatic dispersion compensating in 40Gbit/s system based on enhanced thermal chirping fiber
Bragg grating is demonstrated. The dynamic dispersion is provided by a tunable dispersion compensator based on
enhanced thermal chirping fiber Bragg grating, which can change the group velocity delay (GVD) without changing the
center wavelength or change the center wavelength with a fixed group velocity delay (GVD).
In this letter, a novel simultaneous demultiplexing and clock recovery unit based on EAMs and clock recovery module is
presented and experimentally demonstrated for a high speed OTDM system. The 10GHz clock signal with low jitter is
extracted from 80Gbit/s and 160Gbit/s OTDM signal, and every channel of the OTDM signal is successfully
demultiplexed using this unit. The power penalty is lower than 3dB at BER of 10-9.
Temperature dependence of dispersion of G.652 fiber is experimental studied. The dispersion and dispersion slop
variations over a temperature rang of 80°C, from -20°C to 60°C are measured. The effects of temperature dependence of
dispersion on 80Gbit/s 100km OTDM system is experimental studied. Eye diagrams ascribed to the temperature of -20°C, 0°C, 20°C, 40°C, 60°C are demonstrated after 100km transmission link. The effect was also evaluated by BER curves. At
last, dispersion thermal coefficient and dispersion slope thermal coefficient of dispersion compensating fiber were
experimentally measured. The possibility of dynamically compensating chromatic dispersion and chromatic dispersion
slope of G.652 fiber due to environmental temperature alterations by controlling the temperature of dispersion
compensating fiber is proposed.
A 160Gbit/s optical time-division-multiplexing (OTDM) transmission system with polarization Scrambler is
demonstrated experimentally. The Scrambler based on the structure of the all-fiber dynamic polarization controller
(PolaRITE II by General Photonics Co.). The polarization controller is controlled accurately the peak scrambling
frequencies and the corresponding half-wave voltages by home-made a singlechip circuit. Both theory and experience
show that the rate of scrambler is related to the spectrum width, spectral distribution, modulation rate and so on. The rate
of Scramble for broadband light would be much slower compare with narrowband light to carrying out depolarization. In
the same width of spectrum, light with abundant spectrum would need a slower rate. The relationship between the Rate
of Scrambler and the Character of different Lasers will be discussed by using Stokes parameters and Mueller matrix.
And the experiments performed to verify the results of theoretical analysis results. The Scrambler can reduce Intersymbol
Interference, Polarization Mode Dispersion (PMD) and Polarization Dependent Loss (PDL) that have are
validated experimentally. Based on the Scrambler, the 160-Gb/s OTDM transmissions are successfully demonstrated.
All-optical SOA-based non-inverted wavelength conversion of 80Gbit/s by using a structure which consists of a SOA
and a followed optical filter is demonstrated. Result illustrates that SOA-based wavelength converter has a weak
nonlinear performance if the optical pulse with a wide spectrum. Moreover, a non-inverted 40Gbit/s and non-inverted
80Gbit/s All-optical wavelength conversion using this simple structure with a narrow spectrum are also demonstrated.
Result shows shat the wavelength conversion at 40Gbit/s can be easily achieved, the wavelength converted eye diagram
is clear. However, the eye diagram is not very clear at 80Gbit/s due to the performance of filter.
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