CN104391418B - Sagnac interferometer all-optical logic device based on erbium-doped fiber coupler - Google Patents

Sagnac interferometer all-optical logic device based on erbium-doped fiber coupler Download PDF

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Publication number
CN104391418B
CN104391418B CN201410640521.3A CN201410640521A CN104391418B CN 104391418 B CN104391418 B CN 104391418B CN 201410640521 A CN201410640521 A CN 201410640521A CN 104391418 B CN104391418 B CN 104391418B
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port
doped fiber
fiber coupler
filter
circulator
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CN104391418A (en
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李齐良
朱梦云
李冬强
张真
胡淼
唐向宏
曾然
魏振
魏一振
周雪芳
卢旸
钱正丰
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention discloses a Sagnac interferometer all-optical logic device based on an erbium-doped fiber coupler. The Sagnac interferometer all-optical logic device is characterized by comprising a first signal source, a second signal source, a first circulator, a second circulator, a combiner, the erbium-doped fiber coupler, a pumping source, an optoisolator, a wave separator, a first filter and a second filter, wherein the first signal source is connected with a1 of the first circulator, a2 of the first circulator is connected with c1 of the combiner, a3 of the first circulator is an output end A, c2 of the combiner is connected with the pumping source, c3 of the combiner is connected with d1 of the erbium-doped fiber coupler, d3 of the erbium-doped fiber coupler is connected with e3 of the wave separator, e1 of the wave separator is connected with the optoisolator, e2 of the wave separator is connected with g1 of the first filter, g2 of the first filter is connected with h2 of the second filter, h1 of the second filter is connected with d4 of the erbium-doped fiber coupler, d2 of the erbium-doped fiber coupler is connected with b2 of the second circulator, b1 of the second circulator is connected with the second signal source, and b3 of the second circulator is an output end B.

Description

Sagnac interferometer all-optical logic devices based on Er-doped fiber coupler
Technical field
The invention belongs to optical information technology field, and in particular to a kind of Sagnac interferometers based on Er-doped fiber coupler All-optical logic device.
Background technology
All-optical logic device is a kind of can to lead to the light that the optical signal of arbitrary input port is transformed into any output port Road switching device.All-optical logic device still realizes all-optical bit identification, number except being used for various computings as traditional logic device According to the important devices of the signal processings such as coding, even-odd check, Address Recognition, demultiplexing, while optical logic device is also real The basis of existing photonic computer, therefore, industry numerous scholars conduct extensive research to it.All-optical logic operations are realized at present Scheme mainly include based on semiconductor optical amplifier and based on highly nonlinear optical fiber.There is power in existing all-optical logic device Low, switch response speed is slow, antijamming capability is weak etc. defect.
The content of the invention
For the shortcoming of existing all-optical logic device, the invention provides a kind of Sagnac based on Er-doped fiber coupler is dry Interferometer all-optical logic device, it has the advantages that low pump power, switch fast response time, strong antijamming capability, is suitably applied System of all Optical Communication.
The present invention make use of the Gao Fei of Er-doped fiber based on the Sagnac interferometer all-optical logic devices of Er-doped fiber coupler Linearly, different logic functions are not only realized in theory, and can substantially reduce pumping light power.
The present invention takes technical scheme below：Based on the Sagnac interferometer all-optical logic devices of Er-doped fiber coupler, bag Include signal source (1-1), signal source (1-2), circulator (2-1), circulator (2-2), wave multiplexer (3), Er-doped fiber coupler (4), pumping source (5), optoisolator (6), channel-splitting filter (7), wave filter (8-1), wave filter (8-2), signal source (1-1) and annular First port (a1) connection of device (2-1), the second port (a2) of circulator (2-1) and the first port (c1) of wave multiplexer (3) Connection, the 3rd port (a3) of circulator (2-1) is output terminals A, and the second port (c2) of wave multiplexer (3) is with pumping source (5) even Connect, the 3rd port (c3) of wave multiplexer (3) is connected with the first port (d1) of Er-doped fiber coupler (4), Er-doped fiber coupling 3rd port (d3) of device (4) is connected with the 3rd port (e3) of channel-splitting filter (7), the first port (e1) of channel-splitting filter (7) and light Isolator (6) connects, and the second port (e2) of channel-splitting filter (7) is connected with the first port (g1) of wave filter (8-1), wave filter (8-1) second port (g2) is connected with the second port (h2) of wave filter (8-2), the first port (h1) of wave filter (8-2) It is connected with the 4th port (d4) of Er-doped fiber coupler (4), the second port (d2) of Er-doped fiber coupler (4) and circulator (2-2) second port (b2) connection, the first port (b1) of circulator (2-2) is connected with signal source (1-2), circulator (2- 2) the 3rd port (b3) is output end B.
Preferably, the signal wavelength range that signal source (1-1), (1-2) are produced is 1500nm-1550nm, and power is 1mW.
Preferably, the pump wavelength scope produced by pumping source (5) is 900nm-980nm, and power bracket is 0～1W.
Preferably, cross-coupling coefficient of the Er-doped fiber coupler (4) when without additional pump light is 0.5.
Preferably, the passing band wavelength range of wave filter (8-1) and wave filter (8-2) is 1500nm-1550nm.
Preferably, the first port of wave multiplexer (3) is 50% port, and second port is 50% port.
It is a feature of the present invention that and intensity adjustable pump light different with signal light wavelength and flashlight pass through wave multiplexer Together into the first input port of Er-doped fiber coupler, in the 3rd output port pump light Jing channel-splitting filters and the letter of coupler Number light is separated subsequently into optoisolator.And flashlight continues around ring transmission, around Jing couplers after ring one week again secondary coupling from defeated Go out end output.Using optical kerr effect, the coefficient of coup of coupler can be changed when the power of pump light is adjusted, so as to realize The logical transition function of flashlight.
The present invention produces Cross-phase Modulation using the light intensity of pump light to flashlight, makes two of Er-doped fiber coupler Propagation constant in waveguide changes, i.e., the coefficient of coup of Er-doped fiber coupler changes, so as to change flashlight in output end Power distribution, realize logical transition function.
All-optical logic device of the present invention utilizes Cross-phase Modulation, produces optical kerr effect, with low with pump power, opens The advantages of closing fast response time, strong antijamming capability, is suitably applied System of all Optical Communication.
Description of the drawings
Fig. 1 is the structural representation based on the Sagnac interferometer all-optical logic devices of Er-doped fiber coupler.
Fig. 2 a, 2b are the logic device characteristic curve that the lower Output optical power of different input combinations changes with pumping light power.
In Fig. 2 a, 2b, T1Represent the power output of output port A, T2Represent the power output of output port B.Left figure (figure 2a) output characteristic curve when only signal source (1-1) has input, right figure (Fig. 2 b) be signal source (1-1) and (1-2) all There is output characteristic curve during input.
Specific embodiment
The embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
As shown in figure 1, Sagnac interferometer all-optical logic device of the present embodiment based on Er-doped fiber coupler, including signal Source 1-1, signal source 1-2, circulator 2-1, circulator 2-2, wave multiplexer 3, Er-doped fiber coupler 4, pumping source 5, optoisolator 6th, channel-splitting filter 7, wave filter 8-1, wave filter 8-2, the pumping wave wave-length coverage produced by pumping source 5 be 900nm-980nm, power Scope is 0～1W.The signal wavelength range that signal source 1-1,1-2 is produced is 1500nm-1550nm, and power is 1mW.Er-doped fiber Cross-coupling coefficient of the coupler 4 when without additional pump light is 0.5.First wave filter 8-1, the second wave filter 8-2 it is logical Bandgap wavelength scope is 1500nm-1550nm.The first port of wave multiplexer 3 is 50% port, and second port is 50% port.
Signal source 1-1 is connected with first port a1 of circulator 2-1, second port a2 and the wave multiplexer 3 of circulator 2-1 First port c1 connects, and the 3rd port a3 of circulator 2-1 is output terminals A, and second port c2 and the pumping source 5 of wave multiplexer 3 connect Connect, the 3rd port c3 of wave multiplexer 3 is connected with first port d1 of Er-doped fiber coupler 4, the 3rd of Er-doped fiber coupler 4 the Port d3 is connected with the 3rd port e3 of channel-splitting filter 7, and first port e1 of channel-splitting filter 7 is connected with optoisolator 6, channel-splitting filter 7 Second port e2 is connected with first port g1 of wave filter 8-1, second port g2 of wave filter 8-1 and the second of wave filter 8-2 Port h2 connects, and first port h1 of wave filter 8-2 is connected with the 4th port d4 of Er-doped fiber coupler 4, Er-doped fiber coupling Second port d2 of clutch 4 is connected with second port b2 of circulator 2-2, first port b1 and signal source 1-2 of circulator 2-2 Connection, the 3rd port b3 of circulator 2-2 is output end B.
Pump light is connected by wave multiplexer with Er-doped fiber coupler first port, behind the port of coupler the 3rd from Channel-splitting filter first port is exported, and flashlight 1-1 sequentially passes through circulator, and wave multiplexer enters coupler first port, flashlight 1-2 Through circulator enter coupler second port, two flashlights couple in coupler after from the end of coupler the three, the 4th Mouth output, then transmits around ring, to sequentially pass through and turn again to coupler after two wave filters, and second coupling occurs in coupler Jing circulators output after conjunction.
The power output of adjustable pump light, calculates the power output of output port, is patrolled according to extinction ratio decision logic device Collect function.
Fig. 2 shows that in the case of given input signal power the power output of two output ports becomes with pumping light power The logic device characteristic curve of change.Cusp means that output signal luminous power is equal, and pump power now is referred to as threshold Value power.
Table 1 is represented and selects a pump power, according to the different truth tables for being input into the all-optical logic device that combination draws.
Table 1
Table 1 is the all-optical logic device logic true value table.
In table 1, a1, b1 and A, B represents respectively the input/output port of signal, and logical value " 0 " and " 1 " indicate no signal Input.XijIt is extinction ratio, for judging to export logical value.
All-optical logic device of the present invention realizes process：
1st, according to switching characteristic curve, pump light threshold power is found out.
2nd, according to threshold power, different pump powers are selected, is combined in combination with different inputs, it is real
Existing different optical logic gate.
The preferred embodiments of the present invention and principle are described in detail above, to one of ordinary skill in the art Speech, according to the thought that the present invention is provided, will change in specific embodiment, and these changes also should be regarded as the present invention Protection domain.

Claims (5)

1. Sagnac interferometer all-optical logic devices based on Er-doped fiber coupler, it is characterized in that including the first signal source (1-1), Secondary signal source (1-2), first annular device (2-1), the second circulator (2-2), wave multiplexer (3), Er-doped fiber coupler (4), Pumping source (5), optoisolator (6), channel-splitting filter (7), the first wave filter (8-1), the second wave filter (8-2), the first signal source (1- 1) it is connected with the first port (a1) of first annular device (2-1), the second port (a2) and wave multiplexer of first annular device (2-1) (3) first port (c1) connection, the 3rd port (a3) of first annular device (2-1) is the first output end (A), wave multiplexer (3) Second port (c2) be connected with pumping source (5), the of the 3rd port (c3) of wave multiplexer (3) and Er-doped fiber coupler (4) Single port (d1) connects, and the 3rd port (d3) of Er-doped fiber coupler (4) is connected with the 3rd port (e3) of channel-splitting filter (7), The first port (e1) of channel-splitting filter (7) is connected with optoisolator (6), second port (e2) and first wave filter of channel-splitting filter (7) (8-1) first port (g1) connection, the second port (g2) of the first wave filter (8-1) and the second of the second wave filter (8-2) Port (h2) connects, and the first port (h1) of the second wave filter (8-2) is with the 4th port (d4) of Er-doped fiber coupler (4) even Connect, the second port (d2) of Er-doped fiber coupler (4) is connected with the second port (b2) of the second circulator (2-2), the second ring The first port (b1) of shape device (2-2) is connected with secondary signal source (1-2), and the 3rd port (b3) of the second circulator (2-2) is Second output end (B)；The signal wavelength range that first signal source (1-1), secondary signal source (1-2) are produced is 1500nm- 1550nm, power is 1mW.
2. Sagnac interferometers all-optical logic device as claimed in claim 1, is characterized in that：Pumping produced by pumping source (5) Optical wavelength range is 900nm-980nm, and power bracket is 0～1W.
3. Sagnac interferometers all-optical logic device as claimed in claim 1, is characterized in that：Er-doped fiber coupler (4) is not having There is cross-coupling coefficient during additional pump light to be 0.5.
4. Sagnac interferometers all-optical logic device as claimed in claim 1, is characterized in that：First wave filter (8-1), the second filter The passing band wavelength range of ripple device (8-2) is 1500nm-1550nm.
5. the Sagnac interferometer all-optical logic devices as described in any one of claim 1-4, is characterized in that：The of wave multiplexer (3) Single port is 50% port, and second port is 50% port.
CN201410640521.3A 2014-11-13 2014-11-13 Sagnac interferometer all-optical logic device based on erbium-doped fiber coupler Expired - Fee Related CN104391418B (en)

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CN106199828B (en) * 2016-07-26 2019-06-28 深圳大学 Ultrafast microwave leads the full light trigger of Sagnac ring
CN110989268B (en) * 2019-10-17 2022-11-22 杭州电子科技大学 All-optical logic gate

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