CN110989268B - All-optical logic gate - Google Patents
All-optical logic gate Download PDFInfo
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- CN110989268B CN110989268B CN201910987869.2A CN201910987869A CN110989268B CN 110989268 B CN110989268 B CN 110989268B CN 201910987869 A CN201910987869 A CN 201910987869A CN 110989268 B CN110989268 B CN 110989268B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F3/00—Optical logic elements; Optical bistable devices
Abstract
An all-optical logic gate comprises a Sagnac interferometer, wherein a first semiconductor optical amplifier, a second semiconductor optical amplifier, a first wavelength division multiplexer and a second wavelength division multiplexer are arranged in the Sagnac interferometer, a detection signal enters the Sagnac interferometer and is divided into two paths of detection signals in opposite directions, the detection signals respectively enter the first semiconductor optical amplifier and the second semiconductor optical amplifier for gain adjustment, a pumping signal respectively enters the first semiconductor optical amplifier and the second semiconductor optical amplifier for gain adjustment, the first wavelength division multiplexer is arranged at the outlet end of the first semiconductor optical amplifier and is used for separating the detection signal and the pumping signal output by the first semiconductor optical amplifier to lead out the pumping signal, the second wavelength division multiplexer is arranged at the outlet end of the second semiconductor optical amplifier and is used for separating the detection signal and the pumping signal output by the second semiconductor optical amplifier to lead out the pumping signal, and the detection signals separated by the first wavelength division multiplexer and the second wavelength division multiplexer are combined and output from the Sagnac interferometer after the Sagnac interferometer circles around for a circle.
Description
Technical Field
The invention belongs to the technical field of optical information, and particularly relates to an all-optical logic gate based on cross gain modulation of a Sagnac interferometer and a semiconductor optical amplifier.
Background
Modern communication networks are electro-optical networks formed by connecting switches and electronic devices such as a router on an optical fiber loop, and the inherent 'electronic bottleneck' of the electro-optical network greatly limits the throughput of the network. For this reason, all-optical networks have come into play. The transmission and exchange of information in the all-optical network all use optical signals, and no intermediate optical-electrical and electrical-optical conversion process is needed, so that the all-optical network is an ideal choice for the next generation of networks.
The all-optical switch device is a fundamental stone of an all-optical network and is a core device for realizing all-optical switching. The cross gain modulation in the nonlinear effect of the semiconductor optical amplifier and the cross phase modulation of the coupler 1 are utilized to control and adjust the light waves, and corresponding logical operation is realized. The existing all-optical logic gate based on the semiconductor optical amplifier has the defects of complex structure, unstable operation, correlation with polarization, low operation speed and the like.
Disclosure of Invention
The all-optical logic gate based on the cross gain modulation of the Sagnac interferometer and the semiconductor optical amplifier is simple in structure, stable in operation, independent in polarization, high in operation speed and high in comprehensive potential.
The technical scheme adopted by the invention is as follows:
an all-optical logic gate based on Sagnac interferometer and semiconductor optical amplifier cross-gain modulation, characterized by: the device comprises a Sagnac interferometer, two pumping signals and one detection signal, wherein a first semiconductor optical amplifier, a second semiconductor optical amplifier, a first wavelength division multiplexer and a second wavelength division multiplexer are arranged in the Sagnac interferometer, the detection signal enters the Sagnac interferometer and then is divided into two detection signals with opposite directions, the detection signals respectively enter the first semiconductor optical amplifier and the second semiconductor optical amplifier for gain adjustment, the pumping signal also respectively enters the first semiconductor optical amplifier and the second semiconductor optical amplifier for gain adjustment, the first wavelength division multiplexer is arranged at the outlet end of the first semiconductor optical amplifier and separates the detection signal and the pumping signal output by the first semiconductor optical amplifier to lead out the pumping signal, the second wavelength division multiplexer is arranged at the outlet end of the second semiconductor optical amplifier and separates the detection signal and the pumping signal output by the second semiconductor optical amplifier to lead out the pumping signal, and the detection signal separated by the first wavelength division multiplexer and the detection signal separated by the second wavelength division multiplexer are output from the Sagnac interferometer after surrounding the Sagnac interferometer and output by combining the Sagnac interferometer.
Further, the Sagnac interferometer is composed of a long optical fiber and an optical fiber coupler of 1, the optical fiber coupler has ports c1, c2, c3, and c4, the port c1 is connected to a probe signal, the port c2 is a probe signal output end, the ports c3 and c4 are respectively connected to two ends of the long optical fiber, and the first semiconductor optical amplifier, the second semiconductor optical amplifier, the first wavelength division multiplexer, and the second wavelength division multiplexer are all disposed on the long optical fiber.
Further, the length of the optical fiber coupler is 1cm.
Further, the detection signal is generated by a first continuous wave laser.
Further, the output end of the first continuous wave laser is connected with a circulator which outputs the weak detection signal to the Sagnac interferometer.
Further, a pump signal entering the first semiconductor optical amplifier is generated by a second continuous wave laser.
Further, the output end of the second continuous wave laser is connected with the input end of a first modulator, the first modulator is provided with an electric signal input, the output end of the first modulator is connected with the input end of a first erbium-doped fiber amplifier, and the output end of the first erbium-doped fiber amplifier is connected with the input end of the first semiconductor optical amplifier.
Further, a pump signal entering the second semiconductor optical amplifier is generated by a third continuous wave laser.
Further, the output end of the third continuous wave laser is connected with the input end of a second modulator, the second modulator is provided with an electric signal input, the output end of the second modulator is connected with the input end of a second erbium-doped fiber amplifier, and the output end of the second erbium-doped fiber amplifier is connected with the input end of a second semiconductor optical amplifier.
Further, the external injection current of the first semiconductor optical amplifier and the second semiconductor optical amplifier was 0.65A, and the differential gain coefficient was 1 × 10 -20 m 2 。
The invention has the beneficial effects that: simple structure, stable operation, irrelevant polarization, high operation speed and high comprehensive potential
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 shows an XOR gate formed by different pump signals affecting the output of the transmission side, with the output being 0 only if both pump signals have a strong input or neither.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
Interpretation of terms of art:
sagnac interferometer: the Sagnac interferometer is formed by utilizing the Sagnac effect. The laser is divided into two parts of reflection and transmission by the beam splitter. The two beams of light are reflected by a reflecting mirror to form a closed light path with opposite propagation directions, and the two beams of light are converged on a beam splitter and sent to a light detector, and meanwhile, a part of the light returns to the laser. In such an interferometer, the optical path lengths of the two beams are equal. According to the principle of double-beam light interference, no change of interference light intensity is detected on the photoelectric detector.
Referring to fig. 1, the present embodiment provides an all-optical logic gate based on Sagnac interferometer and semiconductor optical amplifier cross-gain modulation, including Sagnac interferometer 3, two pump signals B 1 、B 2 And a detection signal A 1 A first semiconductor optical amplifier 6-1, a second semiconductor optical amplifier 6-2, a first wavelength division multiplexer 7-1 and a second wavelength division multiplexer 7-2 are arranged in the Sagnac interferometer 3, and the detection signal A 1 After entering the Sagnac interferometer 3, the signal is divided into two detection signals A with opposite directions f And A b And respectively enters a first semiconductor optical amplifier 6-1 and a second semiconductor optical amplifier 6-2 to gain and output a detection signal A f ' and A b ' ofPump signal B 1 、B 2 Respectively enter the first semiconductor optical amplifier 6-1 and the second semiconductor optical amplifier 6-2 for gain adjustment, and the first wavelength division multiplexer 7-1 is arranged at the outlet end f2 of the first semiconductor optical amplifier 6-1 to output a detection signal A output by the first semiconductor optical amplifier 6-1 f ' sum Pump Signal B 1 Separate out pumping signal B 1 The second wavelength division multiplexer 7-2 is arranged at the outlet end f4 of the second semiconductor optical amplifier 6-2 to output the detection signal A output by the second semiconductor optical amplifier 6-2 b ' sum Pump Signal B 2 Separate out pumping signal B 2 The probe signal A separated by the first wavelength division multiplexer 7-1 f And the probe signal A separated by the second wavelength division multiplexer 7-2 b Output from Sagnac interferometer 3 combined into a probe signal A2' after one revolution of Sagnac interferometer 3.
Specifically, the Sagnac interferometer 3 is composed of a long optical fiber and an optical fiber coupler of 1, the optical fiber coupler has ports c1, c2, c3 and c4, and the port c1 and the detection signal a are connected with the optical fiber coupler 1 And a port c2 is a detection signal output end, a port c3 and a port c4 are respectively connected with two ends of the long optical fiber, and the first semiconductor optical amplifier 6-1, the second semiconductor optical amplifier 6-2, the first wavelength division multiplexer 7-1 and the second wavelength division multiplexer 7-2 are all arranged on the long optical fiber. The length of the optical fiber coupler in the embodiment is 1cm.
The detection signal A of the embodiment 1 Generated by a first continuous wave laser 1-1. The output end a of the first continuous wave laser 1-1 is connected with a circulator 2 which outputs a weak detection signal to a Sagnac interferometer 3. Output b2 of circulator 2 is connected to port c1 of Sagnac interferometer 3.
The present embodiment is a pump signal B entering the first semiconductor optical amplifier 6-1 1 Generated by a second continuous wave laser 1-2. The output end d1 of the second continuous wave laser 1-2 is connected with the input end e1 of the first modulator 4-1, the first modulator 4-1 has an electric signal m1 (t) input, the output end e2 of the first modulator 4-1 is connected with the input end h1 of the first erbium-doped fiber amplifier 5-1, and the output end of the first erbium-doped fiber amplifier 5-1h2 is connected to the input f1 of the first semiconductor optical amplifier 6-1.
The pump signal B entering the second semiconductor optical amplifier 6-2 of this embodiment 2 Generated by a third continuous wave laser 1-3. The output end d2 of the third continuous wave laser 1-3 is connected with the input end e3 of the second modulator 4-2, the second modulator 4-2 has an electric signal m2 (t) input, the output end e4 of the second modulator 4-2 is connected with the input end h3 of the second erbium-doped fiber amplifier 5-2, and the output end h4 of the second erbium-doped fiber amplifier 5-2 is connected with the input end f3 of the second semiconductor optical amplifier 6-2.
In this embodiment, the first semiconductor optical amplifier 6-1 and the second semiconductor optical amplifier 6-2 have an external injection current of 0.65A and a differential gain coefficient of 1 × 10 -20 m 2 . The maximum power of the pump signal generated by the continuous laser reaches 0.015 multiplied by 10 after being modulated -3 W。
The invention utilizes a first continuous wave laser 1-1 to generate weak signal detection light, utilizes a circulator 2 to control the signal direction, utilizes the continuous laser to generate pumping signals, and after the pumping signals are amplified by a modulator through optimization, the best logical operation effect is achieved, utilizes a wavelength division multiplexer to lead out the original pumping signals, utilizes a 1.
The first continuous wave laser 1-1 generates a continuous detection signal A 1 Then, the coupling of the coupler is coupled to 1 through a ring 2 to generate two detection signals A, namely a clockwise detection signal A and a counterclockwise detection signal A f And A b Entering into a Sagnac loop, modulating the pump wave by using a digital signal when a continuous laser generates a pump signal and passes through a modulator, and amplifying by using an erbium-doped fiber amplifier to obtain B 1 And B 2 In two pumping signals, in a semiconductor optical amplifier, if pumping light is stronger than continuous detection light, most of reversed current carriers can be transited from a high energy state to a low energy state, and the current carriers are consumed, so that detection is realizedThe carriers required for light amplification are reduced. If the pump light is very weak, even 0, all the reversed carriers are used for amplifying the continuous probe light, so that the probe light realizes high gain, and the logic operation is finally realized by utilizing the interference characteristic of Sagnac.
The process of realizing the optical information logical operation is as follows:
1. firstly, a first continuous wave laser 1-1 is used to generate a low-power continuous signal, i.e. a detection signal A 1 。
2. The detection light is converted into two light signals A in clockwise and anticlockwise directions by cross phase modulation by using a coupler b 、A f 。
3. A continuous laser is used to generate a pumping signal, a modulator is used to modulate the pumping light with a digital signal A (t), and an erbium-doped fiber amplifier is used to amplify the pumping light to generate a pulse sequence B 1 、B 2 . And pumping signals are led out by using a wavelength division multiplexer, so that the influence of pumping light on output is avoided.
4. The detection signal and the pumping signal are input into the semiconductor optical amplifier, and when the pumping signal is strong or weak, whether the gain of the semiconductor optical amplifier is saturated or not is influenced, so that the corresponding detection signal gain is changed. The semiconductor optical amplifier in this case performs cross gain modulation on the weak continuous light.
5. Signal A f 、A b And the signal is required to reach the coupler again after surrounding the Sagnac ring for one circle, and finally the logical operation of the exclusive-OR gate is realized by utilizing the gain and interference characteristics. An exclusive-or gate in which different pump signals affect the output of the transmitting side is shown in fig. 2, and the output is 0 only when both pump signals have a strong input or neither.
Claims (3)
1. An all-optical logic gate based on Sagnac interferometer and semiconductor optical amplifier cross-gain modulation, characterized by: the device comprises a Sagnac interferometer, two pumping signals and a detection signal, wherein a first semiconductor optical amplifier, a second semiconductor optical amplifier, a first wavelength division multiplexer and a second wavelength division multiplexer are arranged in the Sagnac interferometer, the detection signal enters the Sagnac interferometer and is divided into two detection signals with opposite directions, the detection signals respectively enter the first semiconductor optical amplifier and the second semiconductor optical amplifier for gain adjustment, the pumping signal also respectively enters the first semiconductor optical amplifier and the second semiconductor optical amplifier for gain adjustment, the first wavelength division multiplexer is arranged at the outlet end of the first semiconductor optical amplifier and is used for separating the detection signal and the pumping signal output by the first semiconductor optical amplifier to lead out the pumping signal, the second wavelength division multiplexer is arranged at the outlet end of the second semiconductor optical amplifier and is used for separating the detection signal and the pumping signal output by the second semiconductor optical amplifier to lead out the pumping signal, and the detection signal separated by the first wavelength division multiplexer and the detection signal separated by the second wavelength division multiplexer are output from the Sagnac interferometer after surrounding the Sagnac interferometer and are combined;
the Sagnac interferometer is composed of a long optical fiber and an optical fiber coupler of 1, wherein the optical fiber coupler is provided with ports c1, c2, c3 and c4, the port c1 is connected with a detection signal, the port c2 is a detection signal output end, the ports c3 and c4 are respectively connected with two ends of the long optical fiber, and the first semiconductor optical amplifier, the second semiconductor optical amplifier, the first wavelength division multiplexer and the second wavelength division multiplexer are all arranged on the long optical fiber;
the detection signal is generated by a first continuous wave laser; the output end of the first continuous wave laser is connected with a circulator which outputs a weak detection signal to a Sagnac interferometer;
the pumping signal entering the first semiconductor optical amplifier is generated by a second continuous wave laser; the output end of the second continuous wave laser is connected with the input end of a first modulator, the first modulator is provided with an electric signal input, the output end of the first modulator is connected with the input end of a first erbium-doped fiber amplifier, and the output end of the first erbium-doped fiber amplifier is connected with the input end of a first semiconductor optical amplifier;
the pumping signal entering the second semiconductor optical amplifier is generated by a third continuous wave laser; the output end of the third continuous wave laser is connected with the input end of a second modulator, the second modulator is provided with an electric signal input, the output end of the second modulator is connected with the input end of a second erbium-doped fiber amplifier, and the output end of the second erbium-doped fiber amplifier is connected with the input end of a second semiconductor optical amplifier.
2. An all-optical logic gate as claimed in claim 1 wherein: the length of the optical fiber coupler is 1cm.
3. An all-optical logic gate as claimed in claim 1 wherein: the first and second semiconductor optical amplifiers have an external injection current of 0.65A and a differential gain coefficient of 1 × 10 -20 m 2 。
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Citations (4)
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| WO2001090813A2 (en) * | 2000-05-22 | 2001-11-29 | Shaowen Song | N-valued optical logic architecture and method |
| CN104166292A (en) * | 2014-06-26 | 2014-11-26 | 杭州电子科技大学 | Sagnac interferometer all-optical logic device of loop biased amplifier |
| CN104391418A (en) * | 2014-11-13 | 2015-03-04 | 杭州电子科技大学 | Sagnac interferometer all-optical logic device based on erbium-doped fiber coupler |
| CN107153312A (en) * | 2017-04-07 | 2017-09-12 | 深圳大学 | A kind of passive all-optical logic gate and polarization converter |
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2019
- 2019-10-17 CN CN201910987869.2A patent/CN110989268B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001090813A2 (en) * | 2000-05-22 | 2001-11-29 | Shaowen Song | N-valued optical logic architecture and method |
| CN104166292A (en) * | 2014-06-26 | 2014-11-26 | 杭州电子科技大学 | Sagnac interferometer all-optical logic device of loop biased amplifier |
| CN104391418A (en) * | 2014-11-13 | 2015-03-04 | 杭州电子科技大学 | Sagnac interferometer all-optical logic device based on erbium-doped fiber coupler |
| CN107153312A (en) * | 2017-04-07 | 2017-09-12 | 深圳大学 | A kind of passive all-optical logic gate and polarization converter |
Non-Patent Citations (2)
| Title |
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| All-optical parallel parity generator circuit with the help of semiconductor optical amplifier (SOA)-assisted Sagnac switches;Arunava Bhattacharyya等;《Optics Communications》;20131009;全文 * |
| Novel Ultrafast All-Optical XOR Scheme Based on Sagnac Interferometric Structure;Yunfeng Zhou等;《IEEE JOURNAL OF QUANTUM ELECTRONICS》;20050630;CONFIGURATION- OPERATION PRINCIPLE部分 * |
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