On the basis of Sagnac interferometric structure, a simple novel ultrafast scheme of all-optical half-adder is proposed. The structure comprises two of the same balanced terahertz optical asymmetric demultiplexers (TOADs). One TOAD is utilized to achieve an all-optical XOR gate, which is logic SUM. The other is utilized to obtain an all-optical AND gate, which is logic CARRY. Logical SUM and CARRY are simultaneously realized at 80 Gbit/s. Through numerical analysis, the operating characteristics of the scheme are illustrated at 80 Gbit/s. Furthermore, the carrier recovery time of the semiconductor optical amplifier is no longer a crucial parameter to restrict the operation speed of this scheme.
Based on Sagnac interferometric structure, a simple novel ultrafast scheme for an all-optical wavelength converter is proposed. The operations of this scheme with a 80-Gbits/s return to zero (RZ) pseudorandom bit sequence (PRBS) are simulated correctly with an output extinction ratio of more than 17.2 dB. Through numerical analysis, by comparison of the performance at 40- and 80-Gbits/s operation, the operating characteristics of the scheme are illustrated. Furthermore, the carrier recovery time of the semiconductor amplifier (SOA) is no longer a crucial parameter to restrict the operation speed of this scheme.
A new tunable wavelength selector based on the fiber Bragg grating with cladding made of LiNbO3 with optical axis
running along the axis of fiber Bragg grating was investigated. The calculated results indicate that the reflected
wavelength can be tunable from 1550.921 nm to 1548.9668 nm with variation of electric field running along the fiber
axis from 107 to 108V/m, the reflectivity varies from 99.8252% to 99.9715%. The tunable wavelength range will be large
with the electric field increases. These rules indicate that the new tunable wavelength selector based on the fiber Bragg
grating with cladding which is made of uniaxial anisotropic electro-optic crystal material can be achieved through
adjusting the electric field intensity while keeping the fiber grating length, periodicity and the other parameters as
constants.
A simple novel ultrafast scheme of all-optical nonreturn-to-zero(NRZ) to return-to-zero(RZ) is proposed based on
Sagnac interferometric structure. The operations of this scheme at 40Gbit/s 27-1 PRBS sequences are simulated correctly
with the output extinction ratio more than 19.1dB. Through built theoretical model and numerical analysis, the operating
characteristics of the scheme are illustrated. Furthermore, the carrier recovery time of the SOA is no more a crucial
parameter to restrict the operation speed of this scheme.
The paper firstly demonstrates a theoretical investigation of clock recovery from carrier-suppressed return-to-zero
(CSRZ) modulation format data at 40Gbit/s by using SOA-based ring laser. And a completely numerical analysis about
the clock characteristics at 40Gbit/s is done, which is an effective guide for experiment and necessary to optimize the
system performance. Meanwhile, simulation results show high-quality clock recovery from 27-1 PRBS CSRZ data at
40Gbit/s can be achieved by using higher power assist CW light into a SOA-based ring laser.
Based on the Sagnac interferometric structure, a simple novel ultrafast scheme of an all-optical nonreturn-to-zero (NRZ) to return-to-zero (RZ) is proposed. The operations of this scheme at 40 Gbit/s 27−1 PRBS sequences are simulated correctly with an output extinction ratio of more than 19.1 dB. Through a built theoretical model and numerical analysis, the operating characteristics of the scheme are illustrated. Furthermore, the carrier recovery time of the semiconductor optical amplifier (SOA) is no longer a crucial parameter to restrict the operation speed of this scheme. This scheme is potentially capable of all-optical NRZ-to-RZ format converter operation speeds to 80 Gbit/s thus far.
A novel optical single-sideband modulator consisting of eight-phase modulator waveguides is proposed. It features an ideal output signal-to-noise ratio (SNR) when used as a wavelength converter. The calculated results indicate that the wideband wavelength conversion with ideal output SNR can be realized by using this modulator in a fiber loop.
Simultaneous all-optical nonreturn-to-zero (NRZ) to return-to-zero (RZ) format conversion and wavelength conversion in an electroabsorption modulator (EAM) based on cross-absorption modulation (XAM) at 10 Gbit/s is demonstrated. The impact of the bias voltage of EAM and the input NRZ data signal power on the performance of converted RZ signals is studied. The maximum extinction ratio (ER) of converted RZ signals is about 12.08 dB. By tuning the wavelength of input NRZ signals from 1550 to 1570 nm, negative power penalty with a range of −0.9 to −0.2 dB is observed for converted RZ signals. Thus, error-free all-optical simultaneous format and wavelength conversion using EAM is reported, in a setup that has not been demonstrated in the past.
KEYWORDS: Sagnac interferometers, Optical data conversion, Data conversion, Modulation, Solids, Semiconductor optical amplifiers, All optical signal processing, Polarization, Telecommunications
This paper have successfully demonstrated an all-optical wavelength conversion scheme for all-speed return-to-zero (RZ) format data input by using a Sagnac interferometer based on semiconductor optical amplifier (SOA).The attractive issue of the proposed method is that the converted signal can be obtained simultaneously with inverted and noninverted wavelength conversion signals.
This paper focuses on the experimental demonstration of all-optical wavelength conversion at 10 Gbit/s based on cross-bias modulation (XBM) in electroabsorption modulators (EAMs). It is shown that the input 1552 nm pump signal can be converted to 1562.2 nm at 10 Gbit/s by XBM. The optical spectra of both the pump and the probe signals after wavelength conversion is given and the eye diagram of the converted signal is demonstrated. The advantages of the proposed wavelength conversion scheme are also discussed.
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