51 results about "Cross gain modulation" patented technology

Provided are a semiconductor optical amplifier and an optical signal processing method using the same. The reflective semiconductor optical amplifier includes: an optical signal amplification region operating to allow a downward optical signal incident from the external to obtain a gain; and an optical signal modulation region connected to the optical signal amplification region and generating a modulated optical signal. The downward optical signal is amplified through a cross gain modulation using the modulated optical signal and is outputted as an upward optical signal.

The present invention relates to an apparatus and a method for realizing all-optical NOR logic device using the gain saturation characteristics of a semiconductor optical amplifier(SOA). More particularly, the invention relates to a 10 Gbit / s all-optical NOR logic device among all-optical logic devices, in which a signal transmitted from a given point of an optical circuit such as an optical computing circuit is used as a pump signal and a probe signal.The method for realizing an all-optical NOR logic device using the gain saturation characteristics of the SOA according to the present invention comprises the steps of: utilizing A+B signal which couples together an input signal pattern A (1100) and an input signal pattern B (0110) as a pump signal (1110); utilizing a probe signal (1111) by generating a clock signal out of said input signal pattern A (1100); and obtaining a Boolean equation {overscore (A+B)} by making said probe signal and said pump signal incident upon the SOA simultaneously from the opposite direction.The all-optical logic device according to the present invention has a simple construction since it is realized through the XGM (Cross Gain Modulation) method which utilizes the gain saturation characteristics. Also, it is expected that the method employed in the present invention could be used for realizing other all-optical logic circuits and devices.

The invention discloses an all-optical wavelength conversion integrated chip based on transient chirp jump and belongs to the field of photoelectron. The integrated chip comprises a semiconductor optical amplifier, an array waveguide grating and a delay interferometer, wherein the semiconductor optical amplifier, the array waveguide grating and the delay interferometer are connected sequentially and are integrated on a same semiconductor substrate, thereby forming a chip; an input end of the semiconductor optical amplifier is connected with an optical power coupler through an optical fiber; the delay interferometer is connected with the optical fiber; and the optical fiber is arranged at an output end of the integrated chip. According to the all-optical wavelength conversion integrated chip based on the transient chirp jump, a crossing gain modulating effect of the semiconductor optical amplifier is utilized to modulate a signal on pump light to detecting light different in wavelength; under the blue shift filtering action of the array waveguide grating, an ultrafast transient chirp jump dynamic process is extracted; the limitation of slower gain recovery time of the semiconductor optical amplifier to the operating rate is overcome; the speed of wavelength conversion is increased; the integrated chip has the characteristics of high wavelength conversion speed, small volume, easiness in integrating, and the like; the size of the whole all-optical wavelength conversion integrated chip can be reduced to 4.5mm*2mm; and the all-optical wavelength conversion integrated chip can be applied to a routing system of the next generation optical network.

The invention relates to a high-speed all-optical wavelength conversion integrated device and belongs to the technical field of photoelectron. The integrated high-speed all-optical wavelength conversion device mainly comprises a cascaded structure of two semiconductor optical amplifiers and an electroabsorption modulator. By utilizing a cross-gain modulation effect in a first semiconductor optical amplifier, a signal on pumping light is modulated onto detecting light with a different wavelength; by utilizing an electroabsorption effect of the electroabsorption modulator, the pumping light is filtered; and by utilizing a self-gain effect of a second semiconductor optical amplifier, a pattern effect of outputting an optical signal in the high-speed wavelength conversion process is compensated, so that the high-speed all-optical wavelength conversion is realized. In the invention, the electroabsorption modulator is used in the all-optical wavelength conversion device for realizing a filtering function for the first time. When completing the high-speed all-optical wavelength conversion, the integrated high-speed all-optical wavelength conversion device has the characteristics of small size and easiness for integration and can be applied to a routing technology of the next generation of optical network.

The present invention relates to a method of embodying all-optical XOR logic gate by using semiconductor optical amplifier, and more particularly, to a technique to embody all-optical XOR logic gate utilizing the cross-gain modulation (XGM) characteristic of semiconductor optical amplifiers controllable with input currents, illumination signal, and pumping signal.The method of all-optical XOR logic element in accordance with the present invention is characterized to obtain operational characteristic of the all-optical XOR logic element by inputting pump-signal and illumination signal concurrently into two semiconductor optical amplifiers and then summing the two output signals having XGM characteristic arising from gain saturation and wavelength conversion of the semiconductor optical amplifiers.

A phase optimization apparatus and method to obtain a maximum extinction ratio by feeding back a portion of an optical signal output from a Mach-Zehnder interferometer wavelength converter using XPM of a semiconductor optical amplifier to maintain an optimum phase difference between two arms. The phase optimization apparatus includes a first arm having a first semiconductor optical amplifier that amplifies a pump signal and a probe signal, a second arm having a second semiconductor optical amplifier that amplifies the probe signal, and a π phase shifter that controls the phase of the amplified signal, an optical band-pass filter that filters optical signals to output only the modulated probe signal; and a phase control unit that receives feedback to output to the π phase shifter of the second arm a phase control signal, which controls a phase difference between the first and second arms.

A technique for generating variable pulse delays uses one or more nonlinear-optical processes such as cross-phase modulation, cross-gain modulation, self-phase modulation, four-wave mixing or parametric mixing, combined with group-velocity dispersion. The delay is controllable by changing the wavelength and / or power of a control laser. The delay is generated by introducing a controllable wavelength shift to a pulse of light, propagating the pulse through a material or an optical component that generates a wavelength dependent time delay, and wavelength shifting again to return the pulse to its original wavelength.

A multi-band hybrid amplifier is disclosed for use in optical fiber systems. The amplifier uses Raman laser pumps and semiconductor optical amplifiers in series to produce a relatively level gain across the frequency range of interest. Multiple Raman pumps are multiplexed before coupling into the fiber. The Raman amplified optical signal may be demultiplexed and separately amplified by the SOAs before re-multiplexing. Gain profiles of the Raman pumps and the SOAs are selected to compensate for gain tilt and to alleviate the power penalty due to cross-gain modulation in the SOAs. The disclosed hybrid amplifier is especially useful in coarse wavelength division multiplexing (CWDM) systems.

The invention relates to the field of photoelectric technology and discloses a width-adjustable full-light optical switch of a switch window. The full-light optical switch uses cross gain modulation XPM effect of a semiconductor optical amplifier (SOA) for changing the offset of the SOA in a nonlinear optical loop mirror (NOLM) by controlling the delay time of an optical delay line (ODL) in the NOLM, so that the problems that the width of the optical switch is unadjustable, the flexibility of the optical switch is small and the like, the width of the optical switch is adjustable, and the operation is convenient and flexible.

The invention relates to an all-optical multicast optical switch system. A control signal is continuous light with different wavelengths and is reversely input into an SOA-XGM wavelength converter; one part of input signal light enters the wavelength converter, is reversely converted onto control light through cross-gain modulation, and is output in a corresponding second-stage SOA-XGM wavelength converter through a wavelength routing module; the other part of the input signal light is changed into the continuous light through a traveling wave semi-conductor optical amplifier and input into a 1 multiplied by N coupler through an optical isolator, each output end of the 1 multiplied by N coupler is respectively connected with a corresponding second-stage SOA-XGM wavelength converter; in the second-stage wavelength converter, the information on the control light is reversely converted onto the wavelength of the signal light again through the cross-gain modulation, the output of the second-stage wavelength converter is the output of the all-optical multicast optical switch system. The all-optical multicast optical switch system solves the problem of optical signal multicast in the optical switch system by taking advantage of two times of wavelength transformations and the gain saturation of the SOA.

Wavelength converter and methods are based on cross-gain modulation. The wavelength converter has two semiconductor optical amplifiers to perform double cross-gain modulations and double inversions. The first semiconductor optical amplifier performs a first cross-gain modulation on a first continuous wave light using the input light as a modulating light to generate an inverted first-stage cross-gain modulated light. The second semiconductor optical amplifier performs a second cross-gain modulation on a second continuous wave light using the first-stage cross-gain modulated light as a modulating light to generate a double-inverted output light. The output light is non-inverted with respect to the input light.

An optical signal amplification device for outputting an output signal light which has the same wavelength as an input signal light and an intensity variation identical in phase with an intensity variation of the input signal light. The device includes: (a) an amplifying element having a cross gain modulation function of outputting an output light including (i) the output signal light and (ii) a neighboring light which has a neighboring wavelength different from the wavelength of the output signal light and an intensity variation inverted in phase with respect to the intensity variation of the output signal light; (b) inputting means for inputting the input signal light to the amplifying element; (c) a selecting element extracting the output signal light and at least a part of the neighboring light from the output light, such that the extracted output signal light and neighboring light are separated from each other; and (d) feedback means for feeding back the neighboring light extracted by the selecting element, to the amplifying element, so that the neighboring light is inputted to the amplifying element, for rendering the amplifying element to generate a negative feedback amplification effect.

The present invention relates to the microwave signal generation technology field, especially to a tunable optoelectronic oscillator based on cross phase modulation. The tunable optoelectronic oscillator based on cross phase modulation comprises a narrow linewidth laser; light output by a high-power narrow linewidth laser passes through a dual-drive electrooptic intensity modulator, an optical coupler 1, a Mach-Zehnder interferometer and a non-linear fiber loop mirror in order; the Mach-Zehnder interferometer is formed by an optical coupler 2 and an optical coupler 3; the non-linear fiber loop mirror is formed by a wavelength division multiplexer, a high-nonlinear fiber and an optical coupler 4; light output by the optical coupler 3 passes through a photoelectric detector, an amplifier, a band-pass filter, a 10dB coupler and a 3dB bridge; and the 3dB bridge is connected with the dual-drive electrooptic intensity modulator to form an annular resonator. The tunable optoelectronic oscillator based on cross phase modulation also comprises control light, and the control light enters the wavelength division multiplexer through an erbium-doped optical fiber amplifier and a polarization controller in order and enters the non-linear fiber loop mirror through the wavelength division multiplexer.