CN103109475A - Single fiber bidirectional optical component and working method thereof - Google Patents
Single fiber bidirectional optical component and working method thereof Download PDFInfo
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- CN103109475A CN103109475A CN2012800015970A CN201280001597A CN103109475A CN 103109475 A CN103109475 A CN 103109475A CN 2012800015970 A CN2012800015970 A CN 2012800015970A CN 201280001597 A CN201280001597 A CN 201280001597A CN 103109475 A CN103109475 A CN 103109475A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
Abstract
The invention provides a single fiber bidirectional optical component and a working method thereof. The single fiber bidirectional optical component comprises a laser device, a wavelength division multiplexing WDM filter and receiver. The laser device can be used to emit light, and the WDM filter can be used to send the optical fiber through the optical fiber, and the optical fiber receiver can be used to receive the light, and the emitted light can be sent to the receiver. A cut-off filter is also provided, and is disposed between the WDM filter and the receiver, and can be used to filter the interference light of the received light sent by the WDM filter, and then the filtered received light can be sent to the receiver. By using the single fiber bidirectional optical component and the working method thereof, the interference of the interference light can be prevented, and the anti-interference performance can be improved.
Description
Technical field
The embodiment of the present invention relates to the optical-fiber network technology, relates in particular to a kind of single fiber bi-directional optical assembly and method of work thereof.
Background technology
Along with the demand of propelling and the network application of IT application process, EPON (Passive OpticalNetwork is called for short PON) develops rapidly.
Single fiber bi-directional optical assembly (Bi-directional Optical Sub-Assembly, be called for short BOSA) as the important devices of PON, comprise laser, receiver and wave-division multiplexer filter (wavelengthdivision multiplexing filter is called for short the WDM filter).Along with the development of circuit integration, laser, receiver and WDM filter can be integrated in same optical chip, but the light of laser emission can produce interference to the light that receiver receives, and causes receiver to work.
Summary of the invention
The embodiment of the present invention provides a kind of single fiber bi-directional optical assembly and method of work thereof, to avoid interference the interference of light, improves interference free performance.
First aspect, the embodiment of the present invention provides a kind of single fiber bi-directional optical assembly, comprise laser, wave division multiplexing WDM filter and receiver, described laser is used for the emission utilizing emitted light, described WDM filter is used for described utilizing emitted light is sent by optical fiber, and receive light by described optical fiber, and described reception light is sent to described receiver, also comprise:
Cut-off filter is arranged between described WDM filter and described receiver, is used for the stray light filtering with the reception light of described WDM filter transmission, and filtered reception light is sent to described receiver.
In the possible implementation of the first, described cut-off filter specifically is used for the stray light filtering with the preset wavelength of the reception light of described WDM filter transmission, and wherein, described preset wavelength is described radiative wavelength.
In conjunction with the possible implementation of the first of first aspect, in the possible implementation of the second, the second mean receiving power when the first mean receiving power that described receiver also is used for measuring described laser when closing and described laser works, control described cut-off filter and regulate filtering parameter, so that described the first mean receiving power and described the second average power equate or the minimum cut-off filter of difference;
Described cut-off filter also is used for regulating described filtering parameter under the control of described receiver.
In conjunction with the possible implementation of the first of first aspect, in the third possible implementation, described receiver also is used for from described reception light demodulated received signal, determine the error rate of described reception signal, control described cut-off filter and regulate filtering parameter, so that the described error rate is minimum;
Described cut-off filter also is used for regulating described filtering parameter under the control of described receiver.
In conjunction with first to the 3rd any possible implementation of first aspect or first aspect, in the 4th kind of possible implementation, described cut-off filter is waveguide optical grating.
In conjunction with first to the 3rd any possible implementation of first aspect or first aspect, in the 5th kind of possible implementation, described cut-off filter is once moral interferometer of Mach.
In conjunction with first to the 3rd any possible implementation of first aspect or first aspect, in the 6th kind of possible implementation, described laser, described WDM filter, described receiver and described cut-off filter are integrated in same optical chip.
Second aspect, the embodiment of the present invention provide a kind of method of work of single fiber bi-directional optical assembly, comprising:
Cut-off filter is with the stray light filtering in the reception light of WDM filter transmission;
Described cut-off filter sends to receiver with filtered reception light.
In the possible implementation of the first, described cut-off filter is specially the stray light filtering in the reception light of WDM filter transmission:
Described cut-off filter is with the stray light filtering of the preset wavelength in the reception light of described WDM filter transmission, and wherein, described preset wavelength is the radiative wavelength of laser emission.
In conjunction with the possible implementation of the first of second aspect, in the possible implementation of the second, the method for work of described single fiber bi-directional optical assembly also comprises:
Described cut-off filter is regulated parameter under the control of described receiver.
In conjunction with the possible implementation of the second of second aspect, in the third possible implementation, described receiver is controlled described cut-off filter and is regulated filtering parameter, comprising:
The second mean receiving power when the first mean receiving power when the described laser of described receiver measurement cuts out and described laser works, control described cut-off filter and regulate filtering parameter, so that described the first mean receiving power and described the second average power equate or difference is minimum.
In conjunction with the possible implementation of the second of second aspect, in the 4th kind of possible implementation, described receiver is controlled described cut-off filter and is regulated filtering parameter, comprising:
Described receiver is demodulated received signal from described reception light, determines the error rate of described reception signal, controls described cut-off filter and regulates filtering parameter, so that the described error rate is minimum.
As shown from the above technical solution, single fiber bi-directional optical assembly and method of work thereof that the embodiment of the present invention provides, by in the single fiber bi-directional optical assembly, cut-off filter being set, and this cut-off filter is arranged between WDM filter and receiver, the WDM filter can be sent to the stray light filtering in the reception light of receiver, the error rate high defective of having avoided stray light that the impact that receives light is produced, improve the accuracy of interference free performance and reception signal, guaranteed the normal operation of receiver.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do one to the accompanying drawing of required use in embodiment or description of the Prior Art and introduce simply, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of single-fiber bidirectional optical modular construction schematic diagram that Fig. 1 provides for the embodiment of the present invention;
The another kind of single-fiber bidirectional optical modular construction schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The method of work flow chart of a kind of single fiber bi-directional optical assembly that Fig. 3 provides for the embodiment of the present invention;
The method of work flow chart of the another kind of single fiber bi-directional optical assembly that Fig. 4 provides for the embodiment of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
A kind of single-fiber bidirectional optical modular construction schematic diagram that Fig. 1 provides for the embodiment of the present invention.As shown in Figure 1, the single fiber bi-directional optical assembly that the present embodiment provides specifically can be applied in PON, the single fiber bi-directional optical assembly that the present embodiment provides comprises laser 11, wave division multiplexing WDM filter 12 and receiver 13, described laser 11 is used for emission utilizing emitted light S, described WDM filter 12 is used for described utilizing emitted light S is sent by optical fiber, and receive light R by described optical fiber, and described reception light R is sent to described receiver 13.This single fiber bi-directional optical assembly also comprises cut-off filter 14, described cut-off filter 14 is arranged between described WDM filter 12 and described receiver 13, be used for the stray light filtering with the reception light R of described WDM filter 12 transmissions, filtered reception light R is sent to described receiver 13.
Particularly, laser 11 is modulated to utilizing emitted light S with transmitted signal and goes up and launch, and the wavelength of this utilizing emitted light S is for example λ
1, WDM filter 12 can separate the utilizing emitted light of different wave length with reception light, this utilizing emitted light S is sent by optical fiber, and WDM filter 12 can also be separated the reception light R in optical fiber, and this wavelength that receives light R is for example λ
2WDM filter 12 should receive light R and send to receiver 13, in process of transmitting, received can the be interfered interference of light of light R, and this stray light can for the utilizing emitted light S of laser 11 emissions, also can be other stray lights.Between WDM filter 12 and receiver 13, cut-off filter 14 is set, this cut-off filter 14 can perhaps only allow the light of preset wavelength pass through the light filtering of preset wavelength, to realize the filtering to stray light.Cut-off filter 14 will send to receiver 13 after receiving stray light filtering in light R, and receiver 13 demodulates the reception signal from the reception light R that receives.
The single fiber bi-directional optical assembly that the present embodiment provides, by cut-off filter 14 is set in the single fiber bi-directional optical assembly, and this cut-off filter 14 is arranged between WDM filter 12 and receiver 13, WDM filter 12 can be sent to the stray light filtering in the reception light R of receiver 13, the error rate high defective of having avoided stray light that the impact that receives light R is produced, improve the accuracy of interference free performance and reception signal, guaranteed the normal operation of receiver 13.
In the present embodiment, described cut-off filter 14 specifically can be used for the stray light filtering with the preset wavelength of the reception light R of described WDM filter 12 transmissions, and wherein, described preset wavelength is the wavelength of described utilizing emitted light S.
Particularly, the utilizing emitted light S of laser 11 emissions is larger to the interference that receives light R, and preset wavelength is set to the wavelength of utilizing emitted light S, and cut-off filter 14 can be with the utilizing emitted light S filtering as stray light.
In the present embodiment, described cut-off filter 14 is waveguide optical grating.
Particularly, waveguide optical grating is the One Dimension Periodic waveguiding structure, and its refractive index is along the waveguide cyclic variation.This periodic variations in refractive index can cause incident wave and reflected wave to produce relevant the reinforcement or the relevant effect that weakens.When incident wavelength satisfies the Bragg conditioned reflex, incident light will be reflected.The Bragg conditioned reflex is:
Wherein, λ is incident light wave length, n
effBe the effective refractive index of waveguide, A is the cycle of grating, and m is the exponent number of grating.If comprise different wave length ripple signal in incident light, the light wave that wherein satisfies the Bragg conditioned reflex will be reflected by waveguide optical grating, and other light waves will be through waveguide optical grating.Can realize that by the parameter that waveguide optical grating is set the incident light wavelength of this waveguide optical grating reflection is for disturbing light wavelength, will receive the stray light filtering in light R by waveguide optical grating.
In the present embodiment, described cut-off filter 14 is once moral interferometer (Mach-ZehnderInterferometer is called for short MZI) of Mach.
Particularly, have an input and two outputs at MZI, be respectively output 1 and output 2.The incident light of coming in by input is assigned on two branch roads of MZI, due to the optical path difference ne of these two branch roads
ffThe phase difference that Δ L produces is:
Wherein, λ is incident light wave length, n
effBe the effective refractive index of waveguide, Δ L is the length difference of two-way waveguide.If the light intensity of incident light is P
in, the light intensity of two outputs of MZI is respectively:
For different wavelength, the caused phase difference of the optical path difference of two branch roads of MZI is different, works as λ
1Satisfy:
Wavelength is λ
1Incident light export from port one;
Work as λ
2Satisfy:
Wavelength is λ
2Incident light from port 2 output.
Can realize that by the parameter that MZI is set MZI exports for the light of the wavelength of reception light R wavelength by port one, this port one will receive light R and send to receiver 13, MZI inputs for the light that disturbs light wavelength wavelength by port 2, and consumes, to realize the filtering to stray light.
The another kind of single-fiber bidirectional optical modular construction schematic diagram that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2, in the present embodiment, the second mean receiving power when the first mean receiving power that described receiver 13 also is used for measuring described laser 11 when closing and 11 work of described laser, control described cut-off filter 14 and regulate parameter, so that described the first mean receiving power and described the second average power equate or difference is minimum.Correspondingly, described cut-off filter 14 also is used for regulating filtering parameter under the control of described receiver 13.
Particularly, due to disturb light wavelength may be in time or the variation of environment (as temperature) change, need the filtering parameter of cut-off filter 14 is adjusted adaptively, to improve the filtration result to stray light.
In one implementation, first laser 11 cuts out, receiver 13 is measured the first mean receiving power, again laser 11 is opened, receiver 13 is measured the second mean receiving power, some light wavelengths of disturbing do not change, and the first mean receiving power should equate with the second mean receiving power.If the first mean receiving power is different from the second mean receiving power, the wavelength change of stray light is described, cut-off filter 14 is not with the effective filtering of stray light, can determine filtering parameter according to the difference of the first mean receiving power and the second mean receiving power, cut-off filter 14 can be regulated according to this filtering parameter, the wavelength of the disturbing wave that filters out with change, make the first mean receiving power should equate with the second mean receiving power, or make the difference of the first mean receiving power and the second mean receiving power minimum.
In the present embodiment, described receiver 13 also is used for from described reception light R demodulated received signal, determines the error rate of described reception signal, controls described cut-off filter 14 and regulates parameter, so that the described error rate is minimum.Correspondingly, described cut-off filter 14 also is used for regulating filtering parameter under the control of described receiver 13.
In another kind of implementation, because the stray light that receives in light R can make the error rate increase, can realize regulating determining of filtering parameter according to the error rate.Particularly, receiver 13 demodulates the reception signal from the reception light R that receives, and can pass through FEC (Forward Error Correction, forward error correction) and realize Bit Error Code Statistics, and determine to regulate parameter according to the error rate that statistics obtains.Cut-off filter 14 can be regulated parameter according to this and regulate, and the wavelength of the disturbing wave that filters out with change makes the error rate minimum.
Preferably, in the present embodiment, described laser 11, described WDM filter 12, described receiver 13 and described cut-off filter 14 are integrated in same optical chip.
The method of work flow chart of a kind of single fiber bi-directional optical assembly that Fig. 3 provides for the embodiment of the present invention.As shown in Figure 3, the method for work of the single fiber bi-directional optical assembly that the present embodiment provides specifically can realize by the single fiber bi-directional optical assembly that provides embodiment illustrated in fig. 1, and the specific implementation process does not repeat them here.The method of work of the single fiber bi-directional optical assembly that the present embodiment provides specifically comprises:
Step 10, cut-off filter are with the stray light filtering in the reception light of WDM filter transmission;
The method of work of the single fiber bi-directional optical assembly that the present embodiment provides, cut-off filter sends to receiver with the stray light filtering in the reception light of WDM filter transmission with filtered reception light.By cut-off filter being arranged between WDM filter and receiver, cut-off filter can send to the WDM filter stray light filtering in the reception light of receiver, the error rate high defective of having avoided stray light that the impact that receives light is produced, improve the accuracy of interference free performance and reception signal, guaranteed the normal operation of receiver.
In the present embodiment, step 10, described cut-off filter is specifically as follows the stray light filtering in the reception light of WDM filter transmission:
Described cut-off filter is with the stray light filtering of the preset wavelength in the reception light of described WDM filter transmission, and wherein, described preset wavelength is the radiative wavelength of laser emission.
The method of work flow chart of the another kind of single fiber bi-directional optical assembly that Fig. 4 provides for the embodiment of the present invention.As shown in Figure 4, in the present embodiment, the method for work of described single fiber bi-directional optical assembly further can also comprise:
Step 30, described cut-off filter are regulated filtering parameter under the control of described receiver.
In the present embodiment, step 30, described cut-off filter is regulated filtering parameter under the control of described receiver, specifically can comprise:
The second mean receiving power when the first mean receiving power when the described laser of described receiver measurement cuts out and described laser works, control described cut-off filter and regulate filtering parameter, so that described the first mean receiving power and described the second average power equate or difference is minimum.
In the present embodiment, step 30, described cut-off filter is regulated filtering parameter under the control of described receiver, specifically can comprise:
Described receiver is demodulated received signal from described reception light, determines the error rate of described reception signal, controls described cut-off filter and regulates filtering parameter, so that the described error rate is minimum.
It should be noted that step 30 and step 10, step 20 do not have inevitable sequential relationship, can carry out the adjustment of the filtering parameter of cut-off filter in real time.
It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.
Claims (12)
1. single fiber bi-directional optical assembly, comprise laser, wave division multiplexing WDM filter and receiver, described laser is used for the emission utilizing emitted light, described WDM filter is used for described utilizing emitted light is sent by optical fiber, and receive light by described optical fiber, and described reception light is sent to described receiver, and it is characterized in that, also comprise:
Cut-off filter is arranged between described WDM filter and described receiver, is used for the stray light filtering with the reception light of described WDM filter transmission, and filtered reception light is sent to described receiver.
2. single fiber bi-directional optical assembly according to claim 1 is characterized in that:
Described cut-off filter specifically is used for the stray light filtering with the preset wavelength of the reception light of described WDM filter transmission, and wherein, described preset wavelength is described radiative wavelength.
3. single fiber bi-directional optical assembly according to claim 2 is characterized in that:
The second mean receiving power when the first mean receiving power that described receiver also is used for measuring described laser when closing and described laser works, control described cut-off filter and regulate filtering parameter, so that described the first mean receiving power and described the second average power equate or the minimum cut-off filter of difference;
Described cut-off filter also is used for regulating described filtering parameter under the control of described receiver.
4. single fiber bi-directional optical assembly according to claim 2 is characterized in that:
Described receiver also is used for from described reception light demodulated received signal, determines the error rate of described reception signal, controls described cut-off filter and regulates filtering parameter, so that the described error rate is minimum;
Described cut-off filter also is used for regulating described filtering parameter under the control of described receiver.
5. according to claim 1-4 arbitrary described single fiber bi-directional optical assemblies, it is characterized in that: described cut-off filter is waveguide optical grating.
6. according to claim 1-4 arbitrary described single fiber bi-directional optical assemblies is characterized in that: described cut-off filter is Mach moral interferometer once.
7. according to claim 1-4 arbitrary described single fiber bi-directional optical assemblies, it is characterized in that: described laser, described WDM filter, described receiver and described cut-off filter are integrated in same optical chip.
8. the method for work of a single fiber bi-directional optical assembly as described in any one in claim 1 to 7, is characterized in that, comprising:
Cut-off filter is with the stray light filtering in the reception light of WDM filter transmission;
Described cut-off filter sends to receiver with filtered reception light.
9. method according to claim 8, is characterized in that, described cut-off filter is specially the stray light filtering in the reception light of WDM filter transmission:
Described cut-off filter is with the stray light filtering of the preset wavelength in the reception light of described WDM filter transmission, and wherein, described preset wavelength is the radiative wavelength of laser emission.
10. method according to claim 9, is characterized in that, also comprises:
Described cut-off filter is regulated filtering parameter under the control of described receiver.
11. method according to claim 10 is characterized in that, described receiver is controlled described cut-off filter and is regulated filtering parameter, comprising:
The second mean receiving power when the first mean receiving power when the described laser of described receiver measurement cuts out and described laser works, control described cut-off filter and regulate filtering parameter, so that described the first mean receiving power and described the second average power equate or difference is minimum.
12. method according to claim 10 is characterized in that, described receiver is controlled described cut-off filter and is regulated filtering parameter, comprising:
Described receiver is demodulated received signal from described reception light, determines the error rate of described reception signal, controls described cut-off filter and regulates filtering parameter, so that the described error rate is minimum.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2012/082971 WO2014059580A1 (en) | 2012-10-15 | 2012-10-15 | A single fiber bidirectional optical element and working method thereof |
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| CN103109475A true CN103109475A (en) | 2013-05-15 |
| CN103109475B CN103109475B (en) | 2016-08-03 |
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| CN103268003A (en) * | 2013-05-24 | 2013-08-28 | 青岛海信宽带多媒体技术有限公司 | Photoelectronic device based on wavelength division multiplexing |
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| CN101179335B (en) * | 2006-11-10 | 2011-08-10 | 中兴通讯股份有限公司 | Regulation device and method of implementing sideband balance in optical transmission system |
| CN101211087B (en) * | 2006-12-31 | 2011-08-10 | 华为技术有限公司 | Optical fibre amplifier and manufacture method and fiber communication system |
| CN101212076B (en) * | 2007-12-21 | 2011-04-06 | 北京信息工程学院 | Micro mechanical adjustable microwave band-pass filter |
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| CN101635597A (en) * | 2008-07-22 | 2010-01-27 | 华为技术有限公司 | Method for lowering noise of optical amplifier, optical access equipment and optical network system |
| CN102725669A (en) * | 2011-12-30 | 2012-10-10 | 华为技术有限公司 | Method, device and system for initializing wavelength of tunable laser |
| CN202444490U (en) * | 2012-03-02 | 2012-09-19 | 华为技术有限公司 | Optical transceiver module, optical communication device and optical communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103268003A (en) * | 2013-05-24 | 2013-08-28 | 青岛海信宽带多媒体技术有限公司 | Photoelectronic device based on wavelength division multiplexing |
| CN103268003B (en) * | 2013-05-24 | 2015-03-04 | 青岛海信宽带多媒体技术有限公司 | Photoelectronic device based on wavelength division multiplexing |
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| CN103109475B (en) | 2016-08-03 |
| WO2014059580A1 (en) | 2014-04-24 |
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