CN106896617B - A kind of optical wavelength converter towards dpsk signal - Google Patents
A kind of optical wavelength converter towards dpsk signal Download PDFInfo
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- CN106896617B CN106896617B CN201710256781.4A CN201710256781A CN106896617B CN 106896617 B CN106896617 B CN 106896617B CN 201710256781 A CN201710256781 A CN 201710256781A CN 106896617 B CN106896617 B CN 106896617B
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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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
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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
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
- G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
- G02F2/006—All-optical wavelength conversion
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract
The invention discloses a kind of optical wavelength converters towards dpsk signal, the output end of first semiconductor laser is connected through tunable phase shift device with the first input end of photo-coupler, second input termination external input light of photo-coupler, the noninverting input of the first output end connection semiconductor optical amplifier (SOA) of photo-coupler, the reverse input end of the second output terminal connection SOA of photo-coupler, the noninverting input of the output end connection SOA of the second semiconductor laser.First semiconductor laser generates local input light identical with external input optical wavelength, inputs photo-coupler through phase-shifter, the interference in photo-coupler of two-way light generates a pair of differential and balances optical signal.Second semiconductor laser inputs purpose wavelength light to the noninverting input of SOA, and a pair of of optical signal of it and photo-coupler output acts in SOA, the phase modulated signal of generation purpose wavelength.The present invention eliminates interference of the cross-gain modulation to Cross-phase Modulation, realizes efficient all optical wavelength conversion.
Description
Technical field
The invention belongs to fiber optic communications and technical field of optical fiber sensing, in particular to a kind of optical wavelength converter.
Background technique
Phase shift keyed signal is a kind of widely used modulation format of high speed optical communication system, and wherein differential phase keying (DPSK) is believed
Number (dpsk signal) is basic phase shift keyed signal, is the basis of high-order coded format.It is continuous with communications rate
It improves, phase-shift keying (PSK) (PSK) signal becomes the mainstream technology of 40Gb/s, 100Gb/s or more high speed optical communication.However, with high speed
Transmission technology compare, but seem extremely backward in optical-fiber network technical aspect, especially the flexibility of network, reliability and
There are wretched insufficiencies in terms of scalability, and all optical network technology there is no a large amount of business application so far.
Optical wavelength converter is the core devices in optical WDM communication system and optical switching network, for improving net
Reliability, scalability and the self-healing property of network are of great significance.It may be implemented:
(1) the wavelength adaptation of wavelength-division multiplex system.When some user enters optical multiplexer, the wavelength that it is used by
Occupied by other users, need to be that available free wavelength can also be real to realize the connection with WDM network by its wavelength shift
It is connected between existing WDM different-waveband sub-network.
(2) Wavelength dispatching of wavelength switching networks network.In wavelength switching node, the wave of switching node is entered by changing
It is long, the interconnection of different switching ports, schematic diagram and practical structures the figure institute as shown in Figure 1, Figure 2 of wavelength switching node may be implemented
Show.Since AWG has the function that the different wave length that a port inputs is delivered to different output port, become using wavelength
The interconnection of no mechanical action, quick action may be implemented in parallel operation.
(3) flexibility of Wavelength reuse, realization network configuration.In optical transfer network OTN or in automatically switching optical networks
In ASON, empty Wavelength routing is realized using wavelength conversion technique, that is, in entire light transmitting link road, different link sections
Using different wavelength.Flexible management convenient to network may be implemented in this way, fully utilize radio frequency channel resource.
(4) competition of optical cross connect middle port and obstructing problem are solved.For the network as optical packet switching OPS,
Different data packet can be competed in output port, so as to cause obstruction.One of solution is to utilize wavelength conversion technique handle
It is transformed on other wavelength, walks different Wavelength routings.
(5) in addition, wavelength conversion is also widely used in all-optical signal processing technology, such as Technology of Slow Light: original signal light and
Signal light after wavelength conversion injects in a dispersive optical fiber simultaneously, makes wavelength Different lightwave using the dispersion characteristics of optical fiber
Transmission speed it is different, therefore produce delay after the optical fiber by same distance, realize slow light effect.
It exactly sees wavelength shifter to have a very important significance and apply, thus receives significant attention.In the past
In 10 years, although proposing the scheme of many all optical wavelength conversions, rate has been even more than 320Gb/s, however these methods, base
It is for OOK (NRZ or RZ) signal in sheet.With the raising of transmission rate, OOK signal, which is not able to satisfy, further increases speed
The requirement of rate, therefore in the Transmission system of 40Gb/s or more, almost all it has been changed to DPSK, QPSK, QAM, the novel height such as OFDM
Rank coded format, and it is widely used for polarization multiplexing.This allows for wavelength conversion technique of the script towards OOK signal not
It is applicable in again.Over nearly 1 year, start to attract attention towards high-order coded format, it was also proposed that some for novel coding format
Wavelength conversion technique, but from transfer efficiency, practicability, integration etc. all existing defects.
From the principle, wavelength shifter is that the signal light for carrying information with one goes to modulate by a non-linear process
The light of other wavelength makes the light of other wavelength or the optical device of newly generated light carrying original signal optical information.It is currently used
Modulation mechanism mainly has: (1) cross-gain modulation；(2) Cross-phase Modulation；(3) four-wave mixing (parametric process).And on realizing
The main devices for stating non-linear process can be divided into two classes: (1) passive device: highly nonlinear optical fiber, silica-based waveguides, periodic polarized
Lithium niobate (PPLN) optical waveguide etc.；(2) active device: mainly semiconductor optical amplifier SOA also has a small amount of document to mention FP-
Laser.
Wavelength conversion technique based on passive device mainly utilizes their three ranks or second nonlinear process；?
Dielectric structure has in the device (such as optical fiber, silica-based waveguides) of rotational symmetry, and third-order non-linear (Kerr effect) is main mistake
Journey；And in PPLN, second nonlinear is main process.
In all kinds of wavelength conversion schemes using highly nonlinear optical fiber (including high non-linear photon crystal optical fiber), it is based on
The wavelength conversion of highly nonlinear optical fiber four-wave mixing is the widely used wavelength conversion technique of current researcher, because of technology thus
It is transparent to coded format, it is suitable for various high-orders and encodes.Before this, the wavelength conversion of OOK signal is directed to using four-wave mixing
Scheme, has gone through the research of 20 Nian Yunian, technology relative maturity, and the wavelength conversion that can be used as dpsk signal is used.
The wavelength conversion technology of four-wave mixing is applied to high-order coded format, is started from 2013, Japanese AIST's
T.Inoue et al. realizes the wavelength conversion of high-order coded format DP-QPSK signal.To further increase all-optical wavelength converter
Transfer efficiency, they reduce stimulated Brillouin scattering effect, 32nm's by carrying out back-modulations to two pump lights
Wavelength conversion efficiency reaches -1.2dB in range, and realizes the wavelength convert of 86Gb/s DP-QPSK, is 10 in the bit error rate-3Feelings
The Power penalty of optical signal to noise ratio is less than 0.3dB under condition.2016, they were again successfully to 96Gb/s DP-16QAM and 144Gb/s
DP-64QAM signal has carried out wavelength conversion.
In terms of the high-order coded format wavelength conversion based on nonlinear fiber, also the progress world Liao Yu is synchronous is ground in China
Study carefully work.2011, more than Hunan University build up the Army team Dong Ze realize 1.2Tb/s OFDM format wavelength conversion (although
OFDM is not in the range of this patent discusses), Power penalty 2dB.The same year, the Tang pioneer of Zhang Xiaoguang team, Beijing University of Post & Telecommunication
The OFDM wavelength convert of 432Gb/s.However, their work is completed in Georgia Tech.2015, flames of war collection
The doctor Li Chao of the remaining few China's guidance of group, completes the wavelength convert of 8-QAM, 16-QAM and 256-QAM, has used the height of long 1km
Nonlinear optical fiber, optical signal to noise ratio are respectively 15dB, 20dB and 25dB.
Although Success in Experiment, optical fiber are some intrinsic scarce for the wavelength conversion based on highly nonlinear optical fiber four-wave mixing
Point is difficult to overcome, for example nonlinear factor is small, polarization and phase-unstable etc..With the development of silica-based waveguides, people start to visit
Rope silicon nanowires or micro-nano waveguide replace nonlinear optical fiber.In addition to this, the four-wave mixing of optical fiber is non-from three ranks of optical fiber
Linear effect (Kerr effect), thus it is very small；And PPLN optical waveguide has second order nonlinear effect, nonlinear factor is big to be obtained
It is more, therefore the three wave mixing effect that can use PPLN optical waveguide carries out wavelength convert.These types of wavelength conversion scheme, although
Laboratory all achieves success, but does not see relevant commodity.
Semiconductor optical amplifier (SOA) has very high nonlinear factor, so can be used for making wavelength shifter.It is based on
SOA four-wave mixing wavelength convert the advantages of be it is insensitive to coded format, suitable for the encoded signal of various formats, but there is also
It is insufficient: first is that the polarization to input signal is very sensitive；Second is that spontaneous emission noise is larger, make under the signal-to-noise ratio of input signal
Drop, ultimately causes the non-linear distortion of conversion signal.In addition, there are also some insoluble disadvantages for such scheme, such as with pump
The increase at Pu and signal light wavelength interval, transfer efficiency sharply decline；Action length in SOA is short, although nonlinear factor is big,
But whole four-wave mixing effect is strong unlike nonlinear optical fiber, needs stronger pumping light power；Furthermore it is realized in SOA
Phase-matching condition needed for four-wave mixing is difficult to meet.
Although four-wave mixing has the advantages that transparent for format, its transfer efficiency is lowly one fatal weak
Point.Transfer efficiency is improved, is nothing but: 1. increasing medium length, by taking optical fiber as an example, even up to 1km length；2. increasing medium
Nonlinear factor, such as using photonic crystal fiber, PPLN etc.；3. increasing pump power, some schemes are even up to watt grade.
The room for improvement in these three directions all very littles, because are as follows: 1. the increase of medium length can bring biggish delay, the influence meeting of dispersion
Show, length has the upper limit；2. no matter improving nonlinear factor from material or from structure, can all cause to match with optical fiber tired
Difficulty, dielectric loss and junction loss increase, net gain decline；3. increasing pump power not only causes increased costs, but also makes
Filtering is difficult, and the three dB bandwidth representative value of filter is 0.1nm at present, and 20dB bandwidth is then greater than 1nm, therefore works as pump light
When adjacent with signal light, when its difference power 20dB if be difficult the influence of filtering pump light, pump power has the upper limit.In addition, right
Have in the dispersion of medium compared with strict requirements, preferably zero dispersion (transfer efficiency highest), however so low dispersion may be led
The four-wave mixing of dwdm system is caused to increase.Due to above-mentioned limitation, there are no see any one towards novel coding format wavelength
Conversion moves towards practical.
Cross-phase Modulation is a kind of nonlinear effect more much better than than four-wave mixing, it is easy to add the information for controlling light
It is loaded in the phase of detection light, main problem is together with it can be stirred with cross-gain modulation.Therefore, how cross-gain is eliminated
The interference to Cross-phase Modulation is modulated, the research for becoming the wavelength conversion technique based on Cross-phase Modulation is crucial.
Summary of the invention
In order to solve the technical issues of above-mentioned background technique proposes, the present invention is intended to provide a kind of towards the complete of dpsk signal
Optical wavelength changer overcomes the defect of existing Technology of All Optical Wavelength Converter, eliminates cross-gain modulation to Cross-phase Modulation
The all optical wavelength conversion based on Cross-phase Modulation is realized in interference.
In order to achieve the above technical purposes, the technical solution of the present invention is as follows:
A kind of optical wavelength converter towards dpsk signal, including the first semiconductor laser, the second semiconductor laser
Device, tunable phase shift device, photo-coupler and semiconductor optical amplifier；
Wherein, first input end phase of the output end of the first semiconductor laser through tunable phase shift device with photo-coupler
Even, the second input termination external input light of photo-coupler, the first semiconductor laser generates identical as external input optical wavelength
Local input light, and input photo-coupler through tunable phase shift device, local input light and external input light are in photo-coupler
Interference generates the optical signal of a pair of differential balance.First output end of photo-coupler connects the in the same direction of semiconductor optical amplifier
Input terminal, the reverse input end of the second output terminal connection semiconductor optical amplifier of photo-coupler, the second semiconductor laser produce
The optical signal of raw purpose wavelength and the noninverting input for inputting semiconductor optical amplifier, three road optical signals are in semiconductor optical amplifier
Interior effect generates the phase modulated signal of purpose wavelength.
Preferred embodiment based on the above-mentioned technical proposal, the optical wavelength converter further include the first optical combiner, the second light
Combiner and optical filter, the first input end of the first optical combiner connect the output end of the second semiconductor laser, the first light
First output end of the second input terminal connection photo-coupler of combiner, the output end connection semiconductor light of the first optical combiner are put
The noninverting input of big device, the second output terminal of the input terminal connection photo-coupler of the second optical combiner, the second optical combiner
First output end connects the reverse input end of semiconductor optical amplifier, and the second input terminal of the second optical combiner is as reversed output
The input terminal of end connection optical filter, the optical signal of the output end output purpose wavelength of optical filter.
Preferred embodiment based on the above-mentioned technical proposal, the first optical combiner and the second optical combiner are wavelength-division multiplex coupling
Device, saves optical filter at this time, i.e. the output end of the second optical combiner optical signal that directly exports purpose wavelength.
Preferred embodiment based on the above-mentioned technical proposal, second optical combiner are optical circulator, the of optical circulator
Single port connects the second output terminal of photo-coupler, the reversed input of the second port connection semiconductor optical amplifier of optical circulator
End, the input terminal of the third port connection optical filter of optical circulator, the light letter of the output end output purpose wavelength of optical filter
Number.
Preferred embodiment based on the above-mentioned technical proposal, first optical combiner and the second optical combiner are normal light
Fine coupler.
Preferred embodiment based on the above-mentioned technical proposal, in the connection procedure of external input light and photo-coupler, first
In the connection procedure of semiconductor laser and photo-coupler, and in the first, second optical combiner and semiconductor optical amplifier
In connection procedure, Polarization Controller is installed additional.
Preferred embodiment based on the above-mentioned technical proposal, the phase-shift value of the tunable phase shift device are pi/2.
Preferred embodiment based on the above-mentioned technical proposal, the photo-coupler are polarization-maintaining fiber coupler.
Preferred embodiment based on the above-mentioned technical proposal, the tunable phase shift device are to squeeze optical fiber type phase-shifter.
Preferred embodiment based on the above-mentioned technical proposal, the tunable phase shift device are polarization maintaining optical fibre phase-shifter.
By adopting the above technical scheme bring the utility model has the advantages that
(1) present invention semiconductor optical amplifier that uses has very big nonlinear factor (about highly nonlinear optical fiber
109Times), although action length is very short (usually 0.5mm), but still apparent wavelength conversion effect can be obtained；
(2) it due to the semiconductor laser and local laser in the present invention, is made of same technique, it is possible to will
They are integrated on a single die, constitute integrated wavelength shifter；
(3) device of the present invention using photo-coupler (passive device) as generation differential balance signal, without noise, property
Energy is stablized, structure is simple, can be integrated in the same waveguide with SOA, local laser；
(4) optical wavelength converter that designs of the present invention, have control optical power it is small, it is small in size, light-weight, be easily achieved
The advantages of.
Detailed description of the invention
Fig. 1 is the functional block diagram of wavelength switching node；
Fig. 2 is the practical structures figure of wavelength switching node；
Fig. 3 is structural block diagram of the invention；
Fig. 4 is the structural block diagram of the embodiment of the present invention 1；
Fig. 5 is the structural block diagram of the embodiment of the present invention 2；
Fig. 6 is the structural block diagram of the embodiment of the present invention 3.
Major Symbol explanation:
1, photo-coupler；2, tunable phase shift device；3, the first semiconductor laser；4, the second semiconductor laser；5,
One optical combiner；6, semiconductor optical amplifier；7, the second optical combiner；8, optical filter；9, optical circulator.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
A kind of optical wavelength converter towards dpsk signal, as shown in figure 3, including that the first semiconductor laser 3 is (local
Laser), the second semiconductor laser 4 (purpose long wavelength laser), tunable phase shift device 2, photo-coupler 1 and semiconductor light
Amplifier 6 (SOA).First input end of the output end of first semiconductor laser 3 through tunable phase shift device 2 Yu photo-coupler 1
11 are connected, and the second input terminal 12 of photo-coupler 1 meets external input light Pin(λ1) (wavelength λ1), the first of photo-coupler 1 is defeated
Outlet 13 connects the noninverting input of semiconductor optical amplifier 6, and the second output terminal 14 of photo-coupler 1 connects semiconductor optical amplification
The reverse input end of device 6, the noninverting input of the output end connection semiconductor optical amplifier of the second semiconductor laser 4, second
Semiconductor laser is for exporting purpose wavelength (λ2) optical signal.
First semiconductor laser generates (wavelength λ identical as external input optical wavelength1) local input light, and through can
Tune phase-shifter input photo-coupler, and in photo-coupler with the external input interference of light, when two signals phase difference be pi/2
When, the process of interference meets following equation:
In above formula, Eout,1And Eout,2It is two output end optical signal P of coupler respectively1(λ1) and P2(λ1) complex amplitude,
EinIt is input optical signal Pin(λ1) complex amplitude, EloIt is the complex amplitude that local laser exports continuous light, in ElBefore o multiplied by
I (imaginary unit) is because the signal have passed through the phase shift of pi/2.It is not difficult to calculate, when | Ein| with | Elo| amplitude is equal and EinPhase
When position is 0 or π, | Eout,1| be respectively 0 orNamely P1(λ1) it is respectively 0 or 2P0；Similarly, | Eout,2|
RespectivelyOr 0, that is, P2(λ1) it is respectively 2P0Or 0.In this way, being achieved that P1(λ1) and P2(λ1) between
Radix-minus-one complement operation also means that the optical signal for outputing a pair of differential balance.When this to the optical signal of differential balance with it is to be transformed
When the optical signal of wavelength is injected separately into SOA in the same direction and reversely, two phase shifts can be obtainedWithWherein α is linewidth enhancement factor.Since the control optical power of positive and negative both direction injection is identical, they
Gain g (t) it is equal, but functionThen
If static operating point is placed in pi/2, and makeIt can be obtained by [0, π] two states.In this way, just realizing
The high-speed phase modulation of area of light, just as removing modulation lithium niobate modulator with the electric signal of high speed.
Embodiment 1
On the basis of Fig. 3, the first optical combiner 5 and the second optical combiner 7, the first optical combiner 5 and second are increased
Optical combiner 7 is ordinary optic fibre coupler.The first input end 51 of first optical combiner 5 connects the second semiconductor laser 4
Output end, the first optical combiner 5 the second input terminal 52 connection photo-coupler 1 the first output end 13, the first optical combiner 5
Output end 53 connect the noninverting input 61 of semiconductor optical amplifier 6, the input terminal 72 of the second optical combiner 7 connects optical coupling
The second output terminal 14 of device 1, the reverse input end of the first output end 73 connection semiconductor optical amplifier 6 of the second optical combiner 7
62, the second output terminal 71 of the second optical combiner 7 exports the optical signal P of purpose wavelengthout(λ2).In the defeated of the second optical combiner 7
Outlet 71 has connect an optical filter 8, for selecting wavelength signals to be converted, and other useless light (input wavelength λ1
Light, noise light) filter out.Due to the filter action of the second wave division multiplex coupler 7, so that from semiconductor optical amplifier 6
The optical signal that reverse input end 62 exports only has the light of purpose wavelength to export from its port 71, to complete from input wavelength
Signal Pin(λ1) to purpose wavelength signals Pout(λ2) wavelength conversion.As shown in Figure 4.
Embodiment 2
On the basis of embodiment 1, the first optical combiner 5 and the second optical combiner 7 are wave division multiplex coupler, at this time
Optical filter 8 is omitted, due to the filter action of the second wave division multiplex coupler 7, so that from the reversed defeated of semiconductor optical amplifier 6
The optical signal for entering 62 output of end, only has the light of purpose wavelength to export from its port 71, to complete from input wavelength signal Pin
(λ1) to purpose wavelength signals Pout(λ2) wavelength conversion.As shown in Figure 5.
Embodiment 3
On the basis of embodiment 1, the second optical combiner 7 in embodiment 1, the ring of light are replaced using optical circulator 9
Row device 9 includes 3 ports 91,92,93, and optical path is 91 → 92 → 93, and port 92 is connected with the output end 14 of photo-coupler 1
It connects, after optical signal enters optical circulator 9 from port 92, from 93 inverse injection of port into the port of semiconductor optical amplifier 6 62；
The optical signal exported from the port of semiconductor optical amplifier 6 62, it is then defeated from port 91 back to 93 ports of optical circulator 9
Out, the optical signal after output selects wavelength to be converted through wave filter 8, filters out other nothings and uses up.As shown in Figure 6.
Embodiment is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, it is all according to
Technical idea proposed by the present invention, any changes made on the basis of the technical scheme are fallen within the scope of the present invention.
Claims (10)
1. a kind of optical wavelength converter towards dpsk signal, it is characterised in that: including the first semiconductor laser, the second half
Conductor laser, tunable phase shift device, photo-coupler and semiconductor optical amplifier；
Wherein, the output end of the first semiconductor laser is connected through tunable phase shift device with the first input end of photo-coupler, light
Second input termination external input light of coupler, the first semiconductor laser generate local identical with external input optical wavelength
Input light, and photo-coupler is inputted through tunable phase shift device, local input light is interferenceed in photo-coupler with external input light,
Generate the optical signal of a pair of differential balance.The noninverting input of the first output end connection semiconductor optical amplifier of photo-coupler,
The reverse input end of the second output terminal connection semiconductor optical amplifier of photo-coupler, the second semiconductor laser generate purpose wave
Long optical signal and the noninverting input for inputting semiconductor optical amplifier, three road optical signals act in semiconductor optical amplifier,
Generate the phase modulated signal of purpose wavelength.
2. according to claim 1 towards the optical wavelength converter of dpsk signal, it is characterised in that: further include first photosynthetic
The first input end of road device, the second optical combiner and optical filter, the first optical combiner connects the defeated of the second semiconductor laser
Outlet, the first output end of the second input terminal connection photo-coupler of the first optical combiner, the output end of the first optical combiner connect
The noninverting input of semiconductor optical amplifier is connect, the input terminal of the second optical combiner connects the second output terminal of photo-coupler, the
The reverse input end of the first output end connection semiconductor optical amplifier of two optical combiners, the second output terminal of the second optical combiner
As the input terminal of inverse output terminal connection optical filter, the optical signal of the output end output purpose wavelength of optical filter.
3. according to claim 2 towards the optical wavelength converter of dpsk signal, it is characterised in that: the first optical combiner and
Second optical combiner is wave division multiplex coupler, saves optical filter at this time, i.e. the output end of the second optical combiner is directly defeated
The optical signal of purpose wavelength out.
4. according to claim 2 towards the optical wavelength converter of dpsk signal, it is characterised in that: the second photosynthetic road
Device is optical circulator, the second output terminal of the first port connection photo-coupler of optical circulator, the second port company of optical circulator
Connect the reverse input end of semiconductor optical amplifier, the input terminal of the third port connection optical filter of optical circulator, optical filter
Output end output purpose wavelength optical signal.
5. according to claim 2 towards the optical wavelength converter of dpsk signal, it is characterised in that: described first is photosynthetic
Road device and the second optical combiner are ordinary optic fibre coupler.
6. according to claim 2 towards the optical wavelength converter of dpsk signal, it is characterised in that: external input light with
In the connection procedure of photo-coupler, in the connection procedure of the first semiconductor laser and photo-coupler, and first, second
In the connection procedure of optical combiner and semiconductor optical amplifier, Polarization Controller is installed additional.
7. according to claim 1 towards the optical wavelength converter of dpsk signal, it is characterised in that: the tunable phase
The phase-shift value for moving device is pi/2.
8. according to claim 1 towards the optical wavelength converter of dpsk signal, it is characterised in that: the photo-coupler
For polarization-maintaining fiber coupler.
9. according to claim 8 towards the optical wavelength converter of dpsk signal, it is characterised in that: the tunable phase
Moving device is to squeeze optical fiber type phase-shifter.
10. according to claim 8 towards the optical wavelength converter of dpsk signal, it is characterised in that: described is tunable
Phase-shifter is polarization maintaining optical fibre phase-shifter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023248218A1 (en) * | 2022-06-21 | 2023-12-28 | Cognifiber Ltd. | Fiber based processing system |
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| CN106896617A (en) | 2017-06-27 |
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