CN104426604B - Single-fiber three-way multiplexer for optical network unit and monolithic integrated reflector - Google Patents
Single-fiber three-way multiplexer for optical network unit and monolithic integrated reflector Download PDFInfo
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- CN104426604B CN104426604B CN201310409323.1A CN201310409323A CN104426604B CN 104426604 B CN104426604 B CN 104426604B CN 201310409323 A CN201310409323 A CN 201310409323A CN 104426604 B CN104426604 B CN 104426604B
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Abstract
The embodiment of the invention discloses a single-fiber three-way multiplexer for an optical network unit and a monolithic integrated reflector. The single-fiber three-way multiplexer comprises a public waveguide, a reflector, an uplink waveguide, a multi-mode interference coupler, a downlink waveguide and a Mach Rehnder Interferometer, wherein the public waveguide is used for accessing optical signals of the first wavelength and the second wavelength, outputting the optical signal of the third wavelength, accessing the optical signal of the fourth wavelength and outputting a reflected optical signal of the fourth wavelength; the reflector is used for reflecting the optical signal of the fourth wavelength, and transmitting the optical signals of the first wavelength, the second wavelength and the third wavelength; the uplink waveguide is used for accessing and transmitting the optical signal of the third wavelength to a multi-mode interference coupler; the multi-mode interference coupler is used for coupling the optical signals of the first wavelength and the second wavelength to a downlink waveguide, and coupling the optical signal of the third wavelength to the public wavelength; the downlink waveguide is used for outputting the optical signals to the first wavelength and the second wavelength to a Mach Rehnder Interferometer; the Mach Rehnder Interferometer is used for separating the optical signal of the first wavelength from that of the second wavelength. The single-fiber three-way multiplexer disclosed by the embodiment of the invention is compact in structure, simple in process step and capable of integrating the reflector function simultaneously.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology and integrated opto-electronic technology, especially a kind of optical network unit and single-chip integration
The single-fiber three-way multiplexer of reflector.
Background technology
In recent ten years, with the development of various high bandwidth business and application, the requirement to broadband network bandwidth is increasingly
High.Traditional based on copper cable digital subscriber line（Digital Subscriber Line, DSL）The broadband access method of technology
Growing bandwidth demand cannot be met, with EPON（Passive Optical Network, PON）For core
The fiber to the home that the heart is constituted（Fiber To The Home, FTTH）Technology has become as the mainstream technology scheme of access network.Single fiber
Triplexer is the optical network unit of PON user side（Optical Network Unit, ONU）Core devices, its master
The optical signal that function is to three kinds of wavelength of up-downgoing is wanted to carry out input and output coupling and wavelength-division multiplex.Passive with typical Ethernet
Optical-fiber network（Ethernet Passive Optical Network, EPON）And gigabit passive optical network（Gigabit
Passive Optical Network, GPON）As a example technical specification, both of which adopts tri- kinds of 1310nm, 1490nm, 1550nm
The allocative decision of wavelength.Wherein, the optical signal for 1310nm for the wavelength is used for client data signal uplink, and wavelength is 1490nm's
Optical signal is descending for data signal, and wavelength is that the optical signal of 1550nm is descending for analog video signal.Single fiber three-way is multiplexed
The optical signal of three kinds of wavelength is multiplexed in same optical fiber device it is achieved that user side ONU and local side optical line terminal（OLT）'s
Communication.Single-fiber three-way multiplexer commercial at present is made up of discrete device, there is packaging technology complicated, relatively costly etc. scarce
Point.And another is based on Planar Lightwave Circuit Technology（PLC）Single-fiber three-way multiplexer be not due to sandwich layer and clad material
With doping silicon dioxide so that refractive index difference very little between sandwich layer and covering, lead to device size still larger, equally difficult
To reduce production cost.
Optical time domain reflectometer（OTDR）Characterize optical fiber using optical signal Rayleigh scattering in a fiber and Fresnel reflection
The characteristic of link, can carry out the functions such as link load is analyzed and fault is accurately positioned.OTDR operation wavelength in PON is generally
1625nm or 1650nm.But, during realizing the present invention, inventor finds, the optical terminus pair of general user side
The light pulse of OTDR lacks effective reflex mechanism, and leading to cannot to the loss after beam splitter in optical distribution network and event of failure
Detection is it is impossible to realize link detecting function end to end.
Content of the invention
An embodiment of the present invention technical problem to be solved is：For the single fiber three based on discrete device for the prior art
To multiplexer size larger, make and the problems such as packaging technology step is complicated, production cost is larger, a kind of optical network unit is provided
With the single-fiber three-way multiplexer of single-chip integration reflector, with realize single-fiber three-way multiplexer compact conformation, processing step simply with
Shi Jicheng reflector function, can reflect the operation wavelength of OTDR so that OTDR can be based on echo by reflector simultaneously
Long calculating optical link loss and fault location end to end.
A kind of single-fiber three-way multiplexer of single-chip integration reflector provided in an embodiment of the present invention, including the public affairs being sequentially connected
Altogether waveguide, reflector, multi-mode interference coupler, descending waveguide, Mach-Zehnder interferometer and the first output waveguide, and with Mach
Zehnder interferometer is connected and is located at the second output waveguide of Mach-Zehnder interferometer homonymy with the first output waveguide, and does with multimode
Relate to the up waveguide that bonder is connected and is located at multi-mode interference coupler homonymy with descending waveguide；Wherein：
Common waveguide, for accessing the optical signal of first wave length and second wave length, exports the 3rd through reflector transmission
The optical signal of wavelength, and access the optical signal of the 4th wavelength and the reflected light letter exporting the 4th wavelength via reflector reflection
Number；
Reflector, for reflecting the optical signal of the 4th wavelength, and transmission first wave length, second wave length and the 3rd wavelength
Optical signal；
Up waveguide, for accessing the optical signal of the 3rd wavelength and being transferred to multi-mode interference coupler；
Multi-mode interference coupler, for the optical signal of first wave length and second wave length is coupled to descending waveguide, and will
The optical signal of the 3rd wavelength is coupled to common waveguide；
Descending waveguide, for exporting the optical signal of first wave length and second wave length to Mach-Zehnder interferometer；
Mach-Zehnder interferometer, for separating the optical signal of first wave length and second wave length；
First output waveguide, for exporting the optical signal of first wave length；
Second output waveguide, for exporting the optical signal of second wave length.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, described Mach-Zehnder interferometer includes one 1 × 2
Beam splitter, 2 × 2 beam splitters and be in first phase between 1 × 2 beam splitter and 2 × 2 beam splitters postpone waveguide and
Second phase postpones waveguide；Wherein：
1 × 2 beam splitter, is respectively fed to first for the optical signal of first wave length and second wave length is divided into two ways of optical signals
Phase delay waveguide and second phase postpone waveguide；
First phase postpones waveguide and second phase postpones waveguide, is respectively used to the optical signal of first wave length and second wave length
2 × 2 beam splitters are sent into after carrying out different Phase delay；
2 × 2 beam splitters, for according to different Phase delay, the optical signal of first wave length and second wave length are carried out point
From after be respectively fed to the first output waveguide and the second output waveguide.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, described reflector is arranged at described common waveguide
In.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, described single-fiber three-way multiplexer is by insulator
The top layer silicon of upper silicon performs etching and is formed.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, described reflector is specifically by common waveguide
Top carries out the grating that light engraving erosion is formed.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, described grating is specially Bragg grating.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, described first wave length, second wave length and the 3rd ripple
Long optical signal is specially the optical signal of service wavelength；
4th wavelength is specially the operation wavelength of optical time domain reflectometer OTDR.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, the optical signal of first wave length is specially downlink data
Signal；
The optical signal of second wave length is specially analog video signal；
The optical signal of the 3rd wavelength is specially upstream data. signals.
In a specific embodiment of above-mentioned single-fiber three-way multiplexer, first wave length is specially 1490nm；
Second wave length is specially 1550nm；
3rd wavelength is specially 1310nm；
4th wavelength is specially 1625nm or 1650nm.
A kind of optical network unit provided in an embodiment of the present invention, coupling is provided with described in the above-mentioned any embodiment of the present invention
The single-fiber three-way multiplexer of single-chip integration reflector.
The optical network unit being provided based on the above embodiment of the present invention and the single-fiber three-way multiplexer of single-chip integration reflector,
By single-fiber three-way multiplexer and reflector single-chip integration in same device, the functional integration of ONU can be significantly improved, with
When can significantly reduce cost, there is compact conformation, compact, manufacturing process steps are simple.In addition, this single fiber three
Can be to being reflected using the 4th wavelength of OTDR wavelength so that OTDR is reflected by detecting reflector to multiplexer
Optical pulse intensity just can accurately calculate optical link loss and fault location end to end；Simultaneously can be with three kinds of business ripples of transmission
Long, impact is not produced on regular traffic.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description
Constitute the Description of Drawings of a part the embodiments of the invention of description, and be used for explaining together with description
The principle of the present invention.
Referring to the drawings, according to detailed description below, the present invention can be more clearly understood from, wherein：
Fig. 1 is the structural representation of one embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention.
Fig. 2 is the structural representation of another embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention.
Fig. 3 is the structural representation of another embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention.
Description of reference numerals
Specific embodiment
To describe the various exemplary embodiments of the present invention now with reference to accompanying drawing in detail.It should be noted that：Unless other have
Body illustrates, the positioned opposite, numerical expression of the part otherwise illustrating in these embodiments and step and numerical value do not limit this
The scope of invention.
Simultaneously it should be appreciated that for the ease of description, the size of the various pieces shown in accompanying drawing is not according to reality
Proportionate relationship draw.
Description only actually at least one exemplary embodiment is illustrative below, never as to the present invention
And its application or any restriction using.
May be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
When in the case of, described technology, method and apparatus should be considered a part for description.
In all examples with discussion shown here, any occurrence should be construed as merely exemplary, and not
It is as restriction.Therefore, the other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then do not need it is further discussed in subsequent accompanying drawing.
The attributes such as the structure shown by this specification institute accompanying drawing, ratio, size, are all only used for coordinating this specification to be illustrated
Embodiment, be not limited to the enforceable qualificationss of the present invention, therefore there is no technical essential meaning, Ren Hejie
The modification of structure, the adjustment of layout type, the change of proportionate relationship or size, are not affecting effect and the institute that the present invention can be generated by
On the premise of the purpose that can reach, all should still fall in the covering scope of disclosed technology contents.Meanwhile, this explanation
In book cited as " on ", D score and the term such as " first ", " second ", " the 3rd ", " the 4th ", be only used for the bright of narration
, and it is not limited to the enforceable scope of the present invention, being altered or modified, in no substantive change technology of its relativeness
Hold, be similarly considered as the enforceable category of the present invention.
During realizing the present invention, inventor finds, OTDR operation wavelength is generally 1625nm or 1650nm, with net
Above-mentioned three kinds of service wavelength 1310nm, 1490nm, 1550nm in network do not conflict.And, because the light of general user side is whole
End lacks effective reflex mechanism to the light pulse of OTDR, leads to the loss after beam splitter in optical distribution network and event of failure
Cannot detect it is impossible to realize link detecting function end to end.In order to improve the detection spirit to optical link end to end performance for the OTDR
Sensitivity is it may be considered that install a reflector in ONU side, by the operation wavelength of OTDR（1625nm or 1650nm）With close to 100%
Reflective return OTDR, and normal service wavelength（1310nm、1490nm、1550nm）Remain to pass through with the decay of very little
This reflector.OTDR just can accurately calculate light end to end by detecting the optical pulse intensity that this reflector reflects
Link load and fault location.
Fig. 1 is the structural representation of one embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention.As Fig. 1
Shown, common waveguide 11 that the single-fiber three-way multiplexer of this embodiment single-chip integration reflector includes being sequentially connected, reflector 12,
Multi-mode interference coupler 13, descending waveguide 15, Mach-Zehnder interferometer 16 and the first output waveguide 17, and with Mach Zeng Degan
Interferometer 16 is connected and is located at the second output waveguide 18 of Mach-Zehnder interferometer 16 homonymy with the first output waveguide 17,
And be connected and up positioned at multi-mode interference coupler 13 homonymy with descending waveguide 15 with multi-mode interference coupler 13
Waveguide 14.Wherein：
Common waveguide 11, for accessing the optical signal of first wave length and second wave length, output is through reflector 12 transmission
The optical signal of the 3rd wavelength, and access the optical signal of the 4th wavelength and the reflection exporting the 4th wavelength via reflector 12 reflection
Optical signal.
Reflector 12, for reflecting the optical signal of the 4th wavelength, and transmission first wave length, second wave length and the 3rd wavelength
Optical signal.
Up waveguide 14, for accessing the optical signal of the 3rd wavelength and being transferred to multi-mode interference coupler 13.
Multi-mode interference coupler 13, for by multiple-mode interfence（MMI）Principle, by the light letter of first wave length and second wave length
Number be coupled to descending waveguide 15, and by the optical signal of the 3rd wavelength be coupled to common waveguide 11.
Descending waveguide 15, for exporting the optical signal of first wave length and second wave length to Mach-Zehnder interferometer 16.
Mach-Zehnder interferometer 16, for separating the optical signal of first wave length and second wave length.
First output waveguide 17, for exporting the optical signal of first wave length.
Second output waveguide 18, for exporting the optical signal of second wave length.
Optical network unit and the single-fiber three-way multiplexer of single-chip integration reflector that the above embodiment of the present invention provides, will be single
Fine triplexer and reflector carry out single-chip integration, significantly improve the functional integration of ONU, effectively reduce and produce into
This, have the advantages that compact conformation, compact, manufacturing process steps are simple.In addition, this single-fiber three-way multiplexer can be to adopting
Reflected with the 4th wavelength of OTDR wavelength so that OTDR is just permissible by detecting the optical pulse intensity that reflector reflects
Accurately calculate optical link loss and fault location end to end；Simultaneously can be with three kinds of service wavelength of transmission.
Fig. 2 is the structural representation of another embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention.Fig. 3
Structural representation for another embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention.Referring to Fig. 2 and Fig. 3,
In another embodiment of the single-fiber three-way multiplexer of single-chip integration reflector of the present invention, Mach-Zehnder interferometer 16 specifically may be used
To include 161,2 × 2 beam splitter 164 of 1 × 2 beam splitter and to be in 1 × 2 beam splitter 161 and 2 × 2 beam splitters
First phase between 164 postpones waveguide 162 and second phase postpones waveguide 163.Wherein：
1 × 2 beam splitter 161, is respectively fed to for the optical signal of first wave length and second wave length is divided into two ways of optical signals
First phase postpones waveguide 162 and second phase postpones waveguide 163.
First phase postpones waveguide 162 and second phase and postpones waveguide 163, is respectively used to first wave length and second wave length
Optical signal sends into 2 × 2 beam splitters 164 after carrying out different Phase delay.
2 × 2 beam splitters 164, for according to different Phase delay, the optical signal of first wave length and second wave length being carried out
It is respectively fed to the first output waveguide 17 and the second output waveguide 18 after separating.
The optical signal of first wave length and second wave length is divided into two ways of optical signals after passing through 1 × 2 beam splitter 161, respectively through
First phase postpones waveguide 162 and second phase postpones entrance 2 × 2 beam splitters 164 after waveguide 163, because two ways of optical signals obtains
Obtained different Phase delay, and after vector superposed, can export from two output waveguides respectively.Implement principle such as
Under：
If the light field transmission matrix of 1 × 2 beam splitter 161 is：
First phase postpones waveguide 162 and second phase postpones the equivalent light field biography of 163 two Phase delay waveguides of waveguide
Defeated matrix is Wherein, the phase contrast that Δ φ is obtained after Phase delay waveguide for optical signal.
The light field transmission matrix of 2 × 2 beam splitters 164 is：
Can be expressed as from the optical signal of descending waveguide 15 input
If total Phase delay of optical signal experience is Δ φ=π, by the output light letter after Mach-Zehnder interferometer 16
Number intensity is
Corresponding Output optical power is
If total Phase delay of optical signal experience is 0, can be calculated in the same manner, now corresponding Output optical power isIt can be seen that, by designing, first phase postpones waveguide 162 and second phase postpones the length of waveguide 163,
Make the delay of the optical signal acquisition π phase place of first wave length, and the optical signal of second wave length obtains the delay of 0 phase place, two kinds of ripples
Long optical signals are different in the Phase delay of experience, can enter respectively respectively from two output port outputs of 2 × 2 beam splitters
Enter the first output waveguide 17 and 18 two output waveguides of the second output waveguide.
One example of the single-fiber three-way multiplexer embodiment according to single-chip integration reflector of the present invention and unrestricted, reflection
Device 12 can be arranged in common waveguide 11, that is,：Reflector 12, as a part for common waveguide 11, is embedded in common waveguide 11
In.
Referring to Fig. 3, in another embodiment of single-fiber three-way multiplexer of single-chip integration reflector of the present invention, single-chip integration
The single-fiber three-way multiplexer of reflector, that is,：Common waveguide 11 therein, reflector 12, multi-mode interference coupler 13, up waveguide
14th, descending waveguide 15, Mach-Zehnder interferometer 16, the first output waveguide 17 and the second output waveguide 18, can be by insulation
Silicon on body（SOI）19 top layer silicon 20 performs etching to be formed.
Exemplarily, the concrete outcome of reflector 12 can be formed by common waveguide 11 top is carried out with light engraving erosion
Grating, for example, be light engraving erosion formed Bragg grating.
Single-fiber three-way multiplexer and reflector single-chip integration can significantly be carried in same device by the embodiment of the present invention
The functional integration of high ONU, can significantly reduce cost simultaneously, have the advantages that compact conformation, compact.With quasiconductor
The development of technology, has obtained significant progress based on the technology of silicon-on-insulator, due to insulator（Composition is silicon dioxide）With
The refractivity of silicon is very big, therefore can produce ratio general closed planar fiber waveguide（Sandwich layer and clad material are different doping
Silicon dioxide, both refractivity very littles）Smaller optical device；The processing technology being simultaneously based on silicon-on-insulator is with present
Complementary metal oxide semiconductors (CMOS) used in microelectronics industry（Complementary Metal Oxide
Semiconductors, CMOS）Technique is completely compatible, need not complicated make and packaging technology, compact conformation, processing cost is low,
Therefore there is the feasibility of low cost and large-scale production, there is wide industry practical value.
In a concrete application of the embodiment of the present invention, the optical signal tool of first wave length, second wave length and the 3rd wavelength
Body can be the optical signal of service wavelength, and the 4th wavelength can be specifically the operation wavelength of OTDR.
Exemplarily, the optical signal of first wave length can be specifically downlink data signal, and the optical signal of second wave length is permissible
It is analog video signal, the optical signal of the 3rd wavelength can be specifically upstream data. signals.For example, the optical signal of first wave length is
Wavelength is the PON downlink data signal of 1490nm；The optical signal of second wave length is the analog video signal of 1550nm for wavelength；The
Three wavelength channels are the upstream data. signals of 1310nm；4th wavelength channels are the OTDR work of 1625nm or 1650nm
Optical signal.
A kind of ONU provided in an embodiment of the present invention, can couple and be provided with the present invention above-mentioned any embodiment single-chip integration
The single-fiber three-way multiplexer of reflector.
The single-fiber three-way multiplexer of embodiment of the present invention single-chip integration reflector, by being multiplexed reflector and single fiber three-way
Device carries out single-chip integration, achieves the multiplexing work(of three wavelength by the multi-mode interference coupler and Mach-Zehnder interferometer of series connection
Energy；To be formed by performing etching to the top layer silicon of silicon-on-insulator, can realize reflecting by the reflector that light engraving erosion is formed
The function of specific wavelength optical signal.The processing technology of single-fiber three-way multiplexer of embodiment of the present invention single-chip integration reflector is with now
There is CMOS technology completely compatible, need not complicated make and packaging technology, compact conformation, processing cost is low, has wide industry
Practical value.
Description of the invention is given for the sake of example and description, and is not exhaustively or by the present invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Select and retouch
Stating embodiment is in order to the principle of the present invention and practical application are more preferably described, and so that those of ordinary skill in the art is managed
The solution present invention is thus design is suitable to the various embodiments with various modifications of special-purpose.
Claims (10)
1. a kind of single-fiber three-way multiplexer of single-chip integration reflector it is characterised in that include is sequentially connected common waveguide, anti-
Emitter, multi-mode interference coupler, descending waveguide, Mach-Zehnder interferometer and the first output waveguide, and and Mach-Zahnder interference
Instrument is connected and is located at the second output waveguide of Mach-Zehnder interferometer homonymy with the first output waveguide, and and multi-mode interference coupler
Connect and be located at descending waveguide the up waveguide of multi-mode interference coupler homonymy；Wherein：
Common waveguide, for accessing the optical signal of first wave length and second wave length, output is through the 3rd wavelength of reflector transmission
Optical signal, and access the 4th wavelength optical signal and output via reflector reflection the 4th wavelength reflected light signal；
Reflector, for reflecting the optical signal of the 4th wavelength, and the light letter of transmission first wave length, second wave length and the 3rd wavelength
Number；
Up waveguide, for accessing the optical signal of the 3rd wavelength and being transferred to multi-mode interference coupler；
Multi-mode interference coupler, for being coupled to descending waveguide by the optical signal of first wave length and second wave length, and by the 3rd
The optical signal of wavelength is coupled to common waveguide；
Descending waveguide, for exporting the optical signal of first wave length and second wave length to Mach-Zehnder interferometer；
Mach-Zehnder interferometer, for separating the optical signal of first wave length and second wave length；
First output waveguide, for exporting the optical signal of first wave length；
Second output waveguide, for exporting the optical signal of second wave length.
2. single-fiber three-way multiplexer according to claim 1 is it is characterised in that described Mach-Zehnder interferometer includes one
1 × 2 beam splitter, 2 × 2 beam splitters and the first phase being between 1 × 2 beam splitter and 2 × 2 beam splitters postpone ripple
Lead and postpone waveguide with second phase；Wherein：
1 × 2 beam splitter, is respectively fed to first phase for the optical signal of first wave length and second wave length is divided into two ways of optical signals
Postpone waveguide and second phase postpones waveguide；
First phase postpones waveguide and second phase postpones waveguide, is respectively used to first wave length and the optical signal of second wave length is carried out
2 × 2 beam splitters are sent into after different Phase delay；
2 × 2 beam splitters, for according to different Phase delay, the optical signal of first wave length and second wave length being carried out after separation
It is respectively fed to the first output waveguide and the second output waveguide.
3. single-fiber three-way multiplexer according to claim 1 is it is characterised in that described reflector is arranged at described public ripple
In leading.
4. single-fiber three-way multiplexer according to claim 1 is it is characterised in that described single-fiber three-way multiplexer is by exhausted
On edge body, the top layer silicon of silicon performs etching and is formed.
5. single-fiber three-way multiplexer according to claim 4 is it is characterised in that described reflector is specifically by public
Waveguide top carries out the grating that light engraving erosion is formed.
6. single-fiber three-way multiplexer according to claim 5 is it is characterised in that described grating is specially Bragg grating.
7. the single-fiber three-way multiplexer according to claim 1 to 6 any one it is characterised in that described first wave length,
The optical signal of two wavelength and the 3rd wavelength is specially the optical signal of service wavelength；
4th wavelength is specially the operation wavelength of optical time domain reflectometer OTDR.
8. single-fiber three-way multiplexer according to claim 7 is it is characterised in that the optical signal of first wave length is specially descending
Data signal；
The optical signal of second wave length is specially analog video signal；
The optical signal of the 3rd wavelength is specially upstream data. signals.
9. single-fiber three-way multiplexer according to claim 7 is it is characterised in that first wave length is specially 1490nm；
Second wave length is specially 1550nm；
3rd wavelength is specially 1310nm；
4th wavelength is specially 1625nm or 1650nm.
10. a kind of optical network unit it is characterised in that in described optical network unit coupling to be provided with claim 1 to 9 any one
The single-fiber three-way multiplexer of the single-chip integration reflector described in.
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