CN104969565A - Wavelength-division multiplexing (wdm) receiver device and passive optical network system - Google Patents
Wavelength-division multiplexing (wdm) receiver device and passive optical network system Download PDFInfo
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- CN104969565A CN104969565A CN201380001783.9A CN201380001783A CN104969565A CN 104969565 A CN104969565 A CN 104969565A CN 201380001783 A CN201380001783 A CN 201380001783A CN 104969565 A CN104969565 A CN 104969565A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
- G02B6/12009—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/126—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind using polarisation effects
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Abstract
Disclosed are a wavelength-division multiplexing (WDM) receiver device and a passive optical network system. The device comprises: one polarization-dependent array waveguide grating comprising one input waveguide, two FPRs, multiple array waveguides, and a first quantity of output waveguides. The input waveguide receives an incident optical signal having two polarizations, the optical signal is provided with a second quantity of wavelengths, a TE polarized optical signal is chromatically dispersed to a first set of output waveguides via the FPRs and the array waveguides, and a TM polarized optical signal is chromatically dispersed to a second set of output waveguides. Single-mode-multimode couplers are used for receiving a TE polarized optical signal of a corresponding wavelength and outputted by the first set of output waveguides and a TM polarized optical signal of a corresponding wavelength and outputted by the second set of output waveguides and for coupling the TE polarized optical signal and the TM polarized optical signal, both of which are outputted to corresponding photodetectors via a multimode waveguide. The photodetectors convert the coupled optical signals into an electric signal and output same.
Description
A kind of wave division multiplexing WDM receiver apparatus of specification and passive optical network
Technical field
The present invention relates to communication technical field, more particularly to a kind of wave division multiplexing WDM receiver apparatus and passive optical network.Background technology
In wavelength-division multiplex（Wavelength Division Multiplex, WDM) in optical communication system, the signal with equidistant multiple optical wavelength can be simultaneously from Optical Distribution Network（Optical Distribution Network, ODN) WDM receivers are incided, and pass through demultiplexer in WDM receivers（DeMutiplexer, Demux) it is spatially separated into different passages, then the photo-detector connected respectively by each passage（Photo Detector, PD) received, it is transformed into electric signal and is handled, as shown in Figure 1.In principle, it is necessary to which the signal of each wavelength is completely separable to going to avoid the interference to other channels on its corresponding passage.
The development terminated with optic communication, silicon-on-insulator（Silicon On Isolator, SOI) base silicon light technology is in widespread attention, and the silicon optical platform based on S0I has size small, the characteristics of low manufacture cost.But, because S0I waveguides have high refringence, therefore the array waveguide grating made based on S0I platforms（Array Waveguide Grating, AWG) Demux can run into serious Polarization-Sensitive problem.The light wave generally transmitted in a fiber can be divided into two kinds of polarization states of transverse electric mode TE and TM mode TM, it is different for both refractive indexes polarized in the AWG of S0I bases, therefore due to the difference of polarization state, the optical signal of Same Wavelength can be dispersed on two different positions, so that device can not complete the function of demultiplexing.
For the polarization insensitive De legs X on S0I, it has been proposed that a variety of solutions, incident light polarization is separated for example with grating coupler, then demultiplexed respectively by two AWG, is recycled multiple
Grating coupler by the light wave of Same Wavelength passage altogether.In principle, this structure can solve Polarization-Sensitive problem, but this design needs complicated polarization separation grating auxiliary coupler, it is very high to making required precision, two AWG are additionally needed, the area of whole device are increased, in addition, need by two AWG respective channels to demultiplexing wavelength be aligned could realize completely, therefore it is very big to implement difficulty.The content of the invention
The embodiments of the invention provide a kind of wave division multiplexing WDM receiver apparatus and passive optical network, with low cost, the characteristics of designing cylinder and higher process allowance ability.
In a first aspect, the embodiments of the invention provide a kind of wave division multiplexing WDM receiver apparatus, including：The related array waveguide grating of one polarization, including input waveguide, two free diffraction zones
FPR, multiple Waveguide arrays and the first quantity output waveguide；The input waveguide receives the incident wave division multiplexing WDM optical signal that there is transverse electric mode TE to polarize the two kinds of polarizations polarized with TM mode TM, the WDM optical signals have the wavelength of the second quantity, and the signal chromatic dispersion for being polarized TE by multiple Waveguide arrays between described two FRP and described two FRP is to first group of output waveguide, the signal chromatic dispersion that TM is polarized to second group of output waveguide；Wherein described first quantity is twice of the second quantity；Multiple single mode-multi-mode couplers, each single mode-multi-mode coupler is used for the TE polarized light signals for receiving the corresponding wavelength of first group of output waveguide output, with the TM polarized light signals of the corresponding wavelength of second group of output waveguide output, and couple the TE polarized light signals and TM polarized light signals, exported by multimode waveguide；
Multiple photo-detectors, each photo-detector receives the TE polarized light signals and TM polarized light signals after the coupling of the corresponding multimode waveguide output, and the TE polarized light signals and TM polarized light signals after the coupling are converted into electric signal output.
In the first possible implementation, the signal chromatic dispersion that multiple Waveguide arrays by between described two FRP and described two FRP polarize TE is to first group of output waveguide, and the signal chromatic dispersion that TM is polarized is specially to second group of output waveguide：
The wdm optical signal is after the first FRP according to different capacity respectively through corresponding Waveguide array
The 2nd FPR is incided after transmission, and the signal chromatic dispersion for the transverse electric mode TE being polarized by the 2nd FPR is to first group of output waveguide, and the signal chromatic dispersion that TM mode TM is polarized is exported to second group of output waveguide；Wherein, there is fixed length difference between the Waveguide array of adjacent two.
In second of possible implementation, the output angle β of the optical signal of the TE polarizations after the wavelength of the wdm optical signal and dispersionΤΕMeet：
nTEd s in β + n ΤΕ Δ =ηιΤΕ λ
Wherein, nTEAnd n'TEIt is the refractive index of the lower FPR of TE polarizations and Waveguide array respectively； mTEThe diffraction time polarized for TE；D is spacing of adjacent two Waveguide arrays in FPR porch；λ is the wavelength of wdm optical signal；For the length difference of adjacent two Waveguide arrays.
With reference to first aspect or second of implementation of first aspect, in the third possible implementation, first group of output waveguide is the first quantity, and the corresponding diffraction time of Τ Ε output waveguides for the first quantity that first group of output waveguide includes is identical.
In the 4th kind of possible implementation, the output angle β of the optical signal of the Τ Μ polarizations after the wavelength of the wdm optical signal and dispersion is met：
nTMd s in β τΜ + η' ΤΜ Δ =ηιΤΜ λ
Wherein, ηΤΜWith η 'ΤΜIt is the refractive index of the lower FPR of TE polarizations and Waveguide array respectively； mTMFor TM polarizing diffraction levels；D is spacing of adjacent two Waveguide arrays in FPR porch；λ is the wavelength of wdm optical signal；For the length difference of adjacent two Waveguide arrays.
With reference to first aspect or the 4th kind of implementation of first aspect, in the 5th kind of possible implementation, second group of output waveguide is the first quantity, and the corresponding diffraction time of Τ Μ output waveguides for the first quantity that second group of output waveguide includes is identical.
In the 6th kind of possible implementation, the corresponding diffraction time of first group of output waveguide diffraction time corresponding from second group of output waveguide is different.
In the 7th kind of possible implementation, the quantity of the single mode-multi-mode coupler, multimode waveguide and photo-detector is specially the first quantity.
In the 8th kind of possible implementation, the position of first group of output waveguide with described second group
The position of output waveguide is not overlapping.
Second aspect, the embodiments of the invention provide a kind of passive optical network, the passive optical network includes the wave division multiplexing WDM receiver apparatus that first aspect is provided.
The wave division multiplexing WDM receiver apparatus of the embodiment of the present invention, wavelength and polarization are separated by using an AWG, while using single mode-Multiple modes coupling structure, with low cost, the characteristics of designing cylinder and higher process allowance ability.Brief description of the drawings
Fig. 1 is the schematic diagram of wavelength-division multiplex receiver apparatus in the prior art；
Fig. 2 is the schematic diagram of wave division multiplexing WDM receiver apparatus provided in an embodiment of the present invention；Fig. 3 is AWG structural representations provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of passive optical network provided in an embodiment of the present invention.
Below by drawings and examples, the technical scheme to the embodiment of the present invention is described in further detail.Embodiment
Wave division multiplexing WDM receiver apparatus provided in an embodiment of the present invention, can apply in silicon optical communication system, be particularly suitable for use in solving the Polarization-Sensitive problem of the WDM receivers with the AWG Demux based on S0 I matrix manufacturings.
Fig. 2 is the schematic diagram of WDM receiver apparatus provided in an embodiment of the present invention.As illustrated, WDM receiver apparatus includes：One polarization related AWG 1, multiple single mode-multi-mode couplers 2 and multiple photo-detectors 3.
The related AWG 1 of one polarization, including input waveguide 11, two FPR 1 21,122, m Waveguide array 1 23 and 2n output waveguide 13, wherein m, n is positive integer.Input waveguide 13 receives the incident wdm optical signal with two kinds of polarizations, and both polarizations are respectively TE polarizations and TM polarizations.Wdm optical signal has n kind wavelength, and is arrived the transverse electric mode TE signal chromatic dispersions polarized by FRP 12
First group of output waveguide 1 31, the signal chromatic dispersion that TM mode Τ Μ are polarized to second group of output waveguide 1 32.Wherein, AWG structure is specific as shown in Fig. 3 AWG structural representations.In AWG 1, two FPR 121,122 structures are consistent, it is preferred that be all to be made up of up-and-down boundary the Round arcs for the tangent Round that two radiuses are 2 times of relations; small Round is referred to as Luo Lan Round; big Round is referred to as light grid Round, the entrance and exit of Waveguide array 123 is arranged separately on light grid Round, and input waveguide 11 and the connection of output waveguide 13 FPR 121,122 entrance are then sequentially arranged on Luo Lan Round.
Wdm optical signal is inputted by input waveguide 11, light wave diverging is respectively enterd according to different capacity after the first FPR 121 is transmitted in m roots Waveguide array 123, in Waveguide array 123, the length difference of two adjacent Waveguide arrays is that definite value light wave incides the 2nd FPR 122 after the transmission of Waveguide array 123, due to the interference effect of Waveguide array 123, the light wave of different wave length can enter the different positions of the 2nd FPR 122, and be received by corresponding output waveguide 13.Again because for the light wave that TE is polarized and TM is polarized, Waveguide array 123 and FPR 121,122 are different for the refractive index of both polarized lightwaves, therefore can also enter the different positions of the 2nd FPR 122 for the light wave of TE polarizations and the TM same wavelength polarized.
The output angle β of the optical signal of TE polarizations and TM polarizations after the wavelength of wdm optical signal and dispersionΤΕMet respectively with β：
nTEd s ΐηβχΕ + η ΤΕ Δ =ηιΤΕλ (formula 1) nTMd s in TM + η'ΤΜ Δ =ηιΤΜ λ
Wherein, ηΤΜWith η 'ΤΜIt is the refractive index of the lower FPR of TE polarizations and Waveguide array respectively； nTMAnd n'TMIt is the refractive index of the lower FPR of TE polarizations and Waveguide array respectively；1 is the diffraction time that TE is polarized； mTMThe diffraction time polarized for TM；D is spacing of adjacent two Waveguide arrays in FPR porch；λ is the wavelength of wdm optical signal；For the length difference of adjacent two Waveguide arrays. βΤΕOr β is specifically the angle between the center line of Τ Ε or Τ the Μ waveguides exported in the 2nd FPR and connection light grid Round and Luo Lan Round point of contacts and the line of the light grid Round Round hearts.
It follows that AWG can be by different wave length and the signal chromatic dispersion of different polarization states to the corresponding positions of FPR.In the present embodiment, the optical signal of Τ Ε polarizations can be dispersed into above shown in Fig. 2
N adjacent output waveguides, i.e., first group output waveguide 1 31;The optical signal of TM polarizations can be dispersed into n adjacent output waveguides, i.e., second group output waveguide 1 32 below shown in Fig. 2.
Relative position between first group of output waveguide 1 31 and second group of output waveguide 1 32 polarizes the diffraction time m utilized by TE, TMTEAnd mTMDetermined.They can be with identical, or differs.When waveguide is larger to the refractive index differences of two kinds of polarizations, if TE, TM polarization use same diffraction time, it is [blunt remote that the position of this group of output waveguide of TM can deviate from TE groups.The characteristics of usual AWG is that the output waveguide positioned at center obtains maximum coupling efficiency, and more toward edge, then coupling efficiency is lower, therefore all output waveguides will try one's best uniformly close proximity to the energy for causing every waveguide to receive.
Multiple single mode-multi-mode couplers 2.Each single mode-multi-mode coupler 2 is used for the Τ Μ polarized light signals of a kind of Τ Ε polarized light signals of the corresponding wavelength for the first group of output waveguide output for receiving wavelength and the corresponding wavelength of second group of output waveguide output, and couple Τ Ε polarized light signals and Τ Μ polarized light signals, pass through multimode waveguide（Not shown in figure）Output.Therefore to for the wdm optical signal with η kind wavelength, also to have η single mode-multi-mode coupler 2 to receive the η groups Τ Ε polarized light signals and Τ Μ polarized light signals of different wave length and couple.
Multiple photo-detectors 3, each photo-detector 3 receives the multimode waveguide of corresponding single mode-multi-mode coupler 2（Not shown in figure）Τ Ε polarized light signals and Τ Μ polarized light signals after the coupling of output, and the Τ Ε polarized light signals after coupling and Τ Μ polarized light signals are converted into electric signal output.Accordingly, the quantity of photo-detector 3 is also η.
It is described above and constitutes the various pieces of WDM receiver apparatus and be described in detail, the operation principle in conjunction with WDM receiver apparatus of the schematic diagram to being made up of above-mentioned various pieces of the WDM receiver apparatus shown in Fig. 2 is introduced below.
The WDM signal of the η wavelength with two kinds of polarizations transmitted by Optical Distribution Network incides a related AWG of polarization incident waveguide, it is polarization correlated due to AWG, the WDM signal of Τ Ε polarizations can be dispersed into η adjacent output waveguides 1 31 above, and Τ Μ signals can then be dispersed into following η adjacent output waveguides 1 32, exported respectively in single mode form.Two output waveguides of each wavelength corresponding TE, TM 1 31,1 32 are coupled to same multimode waveguide by a single mode-multi-mode coupler 2 again（In figure
It is not shown）The inside.Because multimode waveguide has more patterns, therefore in theory can be with the lossless energy by two output single mode waveguides, then pass through multimode waveguide（Not shown in figure）Directly couple the beam on corresponding photo-detector 3 below, so as to the function for the WDM receivers for realizing polarization insensitive.
WDM receivers provided in an embodiment of the present invention, the wavelength and polarization of the optical signal of the multi-wavelength with two kinds of polarizations are separated by using an AWG, without extra again use polarization separator or other AWG, so as to reduce cost, the area of whole device is reduced；By using single mode-Multiple modes coupling structure, it is to avoid complicated polarized composite wave structure, for polarized composite wave structure, single mode-Multiple modes coupling structure has higher process allowance, it is easier to realize；In addition, by using different diffraction level to TE, TM, overall coupling efficiency can be improved.
The embodiment of the present invention furthermore provides a kind of passive optical network, and the passive optical network can be Wave division multiplexing passive optical network as shown in Figure 4（WDM P0N) system.The WDM P0 systems 400 include being located at local side（Central Office, CO) optical line terminal 410 and multiple optical network units 420 positioned at user side, wherein the optical line terminal 410 passes through Optical Distribution Network（Optical Distribution Network, 0DN) 430 it is connected to the multiple optical network unit 420.The Optical Distribution Network 430 can include trunk optical fiber 431, Wavelength division multiplexer/demultiplexer 432 and multiple branch optical fibers 433, wherein described trunk optical fiber 431 is connected to the optical line terminal 410, and the multiple branch optical fiber 433 is connected to by the Wavelength division multiplexer/demultiplexer 432, the multiple branch optical fiber 433 is connected respectively to the optical network unit 420.Wherein, the Wavelength division multiplexer/demultiplexer 432 can be to be arranged on distant-end node（Remote Node, RN) P cars are bad ' J waveguide optical gratings（Array Waveguide Grating, AWG), i.e. distal end AWG (RN- AWG) 432.
The optical line terminal 410 includes multiple local side transceiver modules 411, the multiple 0LT transceiver modules 411 are coupled to the trunk optical fiber 431 by another Wavelength division multiplexer/demultiplexer 412 positioned at local side, such as local side AWG (C0-AWG).Each optical network unit 420 includes a user terminal transceiver module 421 respectively.Corresponded between the user terminal transceiver module 421 and the local side transceiver module 411, and each local side transceiver module 411 and user terminal transceiver module 421 are respectively adopted different communication wavelengths (λ 1, λ 2 ... λ η) carry out similar point-to-point communication.
Wherein, 411 local side transceiver module includes laser, wavelength division multiplexer WDM and receiver in figure, and the receiver is the WDM receiver apparatus of the corresponding embodiment description of Fig. 2 and Fig. 2 of the embodiment of the present invention.As shown in Fig. 2 the WDM receiver apparatus includes：One polarization related AWG 1, multiple single mode-multi-mode couplers 2 and multiple photo-detectors 3.The specific description for referring to Fig. 2 and corresponding embodiment, here with regard to no longer repeating the concrete structure of WDM receiver apparatus.
Above-described embodiment; the purpose of the present invention, technical scheme and beneficial effect are further described; it should be understood that; it the foregoing is only the embodiment of the present invention; the protection domain being not intended to limit the present invention; within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., should be included in the scope of the protection.
Claims (10)
- Claims1st, a kind of wave division multiplexing WDM receiver apparatus, it is characterised in that described device includes：The related array waveguide grating of one polarization, including input waveguide, two free diffraction zone FPR, the output waveguide of multiple Waveguide arrays and the first quantity；The input waveguide receives the incident wave division multiplexing WDM optical signal that there is transverse electric mode TE to polarize the two kinds of polarizations polarized with TM mode TM, the wdm optical signal has the wavelength of the second quantity, and the signal chromatic dispersion for being polarized TE by multiple Waveguide arrays between described two FRP and described two FRP is to first group of output waveguide, the signal chromatic dispersion that TM is polarized to second group of output waveguide；Wherein described first quantity is twice of the second quantity；Multiple single mode-multi-mode couplers, each single mode-multi-mode coupler is used for the TE polarized light signals for receiving the corresponding wavelength of first group of output waveguide output, with the TM polarized light signals of the corresponding wavelength of second group of output waveguide output, and couple the TE polarized light signals and TM polarized light signals, exported by multimode waveguide；Multiple photo-detectors, each photo-detector receives the TE polarized light signals and TM polarized light signals after the coupling of the corresponding multimode waveguide output, and the TE polarized light signals and TM polarized light signals after the coupling are converted into electric signal output.2nd, device according to claim 1, it is characterized in that, the signal chromatic dispersion that multiple Waveguide arrays by between described two FRP and described two FRP polarize TE is to first group of output waveguide, and the signal chromatic dispersion that TM is polarized is specially to second group of output waveguide：The wdm optical signal incides the 2nd FPR after being transmitted after the first FRP according to different capacity respectively through corresponding Waveguide array, the signal chromatic dispersion for being polarized the transverse electric mode TE by the 2nd FPR is to first group of output waveguide, and the signal chromatic dispersion that TM mode TM is polarized is exported to second group of output waveguide；Wherein, there is fixed length difference between the Waveguide array of adjacent two.3rd, device according to claim 1, it is characterised in that the output angle β of the optical signal of the TE polarizations after the wavelength of the wdm optical signal and dispersionΤΕMeet：nTEd sinpTE + η ΤΕ Δ L=mTEEnterWherein, nTEAnd n'TEIt is the refractive index of the lower FPR of TE polarizations and Waveguide array respectively； mTEIt is inclined for TE The diffraction time shaken；D is spacing of adjacent two Waveguide arrays in FPR porch；λ is the wavelength of wdm optical signal；AL is the length difference of adjacent two Waveguide arrays.4th, device according to claim 3, it is characterised in that first group of output waveguide is the first quantity, and the corresponding diffraction time of Τ Ε output waveguides for the first quantity that first group of output waveguide includes is identical.5th, device according to claim 1, it is characterised in that the output angle β of the optical signal of the Τ Μ polarizations after the wavelength of the wdm optical signal and dispersionΤΜMeet：nTMd sinPiM + η'ΤΜ Δ L=mTMEnterWherein, nTMAnd n'TMIt is the refractive index of the lower FPR of Τ Ε polarizations and Waveguide array respectively； mTMFor TM polarizing diffraction levels；D is spacing of adjacent two Waveguide arrays in FPR porch；λ is the wavelength of wdm optical signal；Δ | _ be adjacent two Waveguide arrays length difference.6th, device according to claim 5, it is characterised in that second group of output waveguide is the first quantity, and the corresponding diffraction time of Τ Μ output waveguides for the first quantity that second group of output waveguide includes is identical.7th, device according to claim 1, it is characterised in that the corresponding diffraction time of first group of output waveguide diffraction time corresponding from second group of output waveguide is different.8th, the device according to claim 1, it is characterised in that the quantity of the single mode-multi-mode coupler, multimode waveguide and photo-detector is specially the first quantity.9th, device according to claim 1, it is characterised in that the position of first group of output waveguide is not overlapping with the position of second group of output waveguide.10th, a kind of passive optical network, it is characterised in that the passive optical network includes the wave division multiplexing WDM receiver apparatus as described in above-mentioned claim 1.
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| CN113132050B (en) * | 2021-04-20 | 2022-07-12 | 中国科学院半导体研究所 | Cross double-input array waveguide grating demultiplexer |
| CN116520487A (en) * | 2023-07-04 | 2023-08-01 | 之江实验室 | Polarization insensitive silicon-based light receiving integrated chip and implementation method thereof |
| CN116520487B (en) * | 2023-07-04 | 2023-09-12 | 之江实验室 | Polarization insensitive silicon-based light receiving integrated chip and implementation method thereof |
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| CN104969565B (en) | 2019-04-26 |
| WO2015054825A1 (en) | 2015-04-23 |
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