CN101030822A - Optical network unit, optical line terminal, passive fiber-optic access network and its transmission - Google Patents
Optical network unit, optical line terminal, passive fiber-optic access network and its transmission Download PDFInfo
- Publication number
- CN101030822A CN101030822A CNA2006100340297A CN200610034029A CN101030822A CN 101030822 A CN101030822 A CN 101030822A CN A2006100340297 A CNA2006100340297 A CN A2006100340297A CN 200610034029 A CN200610034029 A CN 200610034029A CN 101030822 A CN101030822 A CN 101030822A
- Authority
- CN
- China
- Prior art keywords
- optical
- light
- signal
- line terminal
- optical network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/005—Optical Code Multiplex
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The optical network unit comprises: multi wavelength light source and light spectrum spreader. The multi wavelength light source is used to convert the electrical signals into multi wavelength light signals and to send them to the light spectrum spreader; the light spectrum spreader is used to modulate the multi wavelength light signal into spectrum-spreading signals and to send out them. The optical line terminal comprises a light receiver comprising a light de-spreader, a photoelectronic switching module; the light spreader is used for receiving the spectrum-spreading signal, demodulating out light signals and transmitting relevant light pulse to the photoelectronic switching module; the photoelectronic switching module is used to convert the light pulse sequence into electric signals. The passive optical access network comprises: optical line terminal, optical distribution network, optical network unit. The transmission method of the passive optical fiber access network is: transmitting downlink data by using TDM broadcasting way; transmitting uplink data by using CDMA way.
Description
Technical field
The present invention relates to optical access network (OAN, optical access network) technical field, be specifically related to a kind of optical network unit (ONU, Optical Network Unit) and optical line terminal (OLT, Optical Line Terminal) and passive optical network (pon) (PON, Passive Optical Network) and transmission method thereof.
Background technology
OCDMA (Optical Code Division Multiple Access, optical code division multiple access) technology is present newer a kind of optical communication technology, is the same in mathematical theoretical foundation with CDMA technology in the wireless telecommunications, its basic principle is to go out a series of orthogonal codes (or quasiorthogonal code) at the light domain construction (spectrum-spreading address code can be the optical wavelength sequence as user's spectrum-spreading address code, light pulse time-delay sequence even light phase offset sequence etc., as long as they meet quadrature or accurate quadrature on mathematics), after being modulated (light spread spectrum) by these spectrum-spreading address codes, transmitting terminal user's baseband signal sends.All users' light signal can be shared a transmission line (optical fiber).Receiving terminal uses Passive Optical Components and specific spectrum-spreading address code that light signal is carried out correlation reception (photodissociation expansion), has only the light signal that uses same spectrum-spreading address code modulation to be come out by demodulation and is converted to the signal of telecommunication and export.It needs to be noted that it is that optical device realizes that in the light territory signal in the electric territory is always baseband signal that above-mentioned light spread spectrum and photodissociation are expanded.The key technology of OCDMA is design of address codes and optical modulator (light frequency multiplier), the manufacturing of optical demodulator (light despreader).
Existing P ON is when the transmission data, and down direction adopts the broadcast mode based on TDM (Time DivisionMultiplexing, time division multiplexing), and promptly OLT is to all ONU broadcast transmissions, and ONU only accepts to issue the data of oneself; Be based on the technology of TDMA (Time DivisionMultiple Address, time division multiple access) at up direction, promptly different ONU can only send data to OLT in the time slot of appointment.
The TDM/TDMA technology exists the lower shortcoming of natural frequency, and the up direction channel width of TDMA mode is narrower simultaneously, and the unique user limited bandwidth is restricted the application of two-way big bandwidth-version, and power system capacity is undesirable; Require the whole network time synchronized, realize that difficulty is big; Extendibility is poor, the wasting of resources.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of optical network unit and optical line terminal and passive optical network (pon), the passive optical network (pon) that overcomes prior art when the transmission data, the shortcoming that can only transmit based on the TDMA mode at up direction.
Network configuration of the present invention and existing P ON similar, also adopt the TDM broadcast mode at down direction, but at up direction, ONU sends The data OCDMA mode, and the spread spectrum of data adopts Passive Optical Components to realize, the receiving terminal (being actually a receiving array) at OLT adopts Passive Optical Components to finish the despreading of data equally equally.
The present invention adopts following technical scheme:
A kind of optical network unit, comprise light sending device and optical pickup apparatus, light sending device comprises multi wave length illuminating source and light frequency multiplier, multi wave length illuminating source links to each other with the light frequency multiplier, multi wave length illuminating source is used for electrical signal conversion to be multiple wavelength optical signal and to be sent to the light frequency multiplier, the light frequency multiplier is used for according to spectrum-spreading address code multiple wavelength optical signal being modulated into the spread spectrum light signal, and sends the spread spectrum light signal.
Described optical network unit, wherein: the light frequency multiplier is made as the two-dimentional light frequency multiplier based on Bragg grating.
Described optical network unit, wherein: multi wave length illuminating source is made as multiple-wavelength laser or multi-wavelength laser array.
Described optical network unit, wherein: the signal modulation system of multi wave length illuminating source is made as the on-off keying modulation system.
A kind of optical line terminal, comprise at least one optical receiver, light distributor and optical transmitter, light distributor links to each other with optical receiver, optical transmitter respectively, optical receiver comprises light despreader, photoelectric conversion module, the light despreader links to each other with photoelectric conversion module, and the light despreader is used to receive the spread spectrum light signal, demodulates light signal according to spectrum-spreading address code, and sending corresponding light pulse sequence to photoelectric conversion module, photoelectric conversion module is used for light pulse sequence is converted to the signal of telecommunication.
Described optical line terminal, wherein: optical receiver is made as the two-dimentional light despreader based on Bragg grating.
A kind of passive optical network (pon) comprises aforesaid optical line terminal, at least one optical distribution network, at least one aforesaid optical network unit, and optical distribution network links to each other with described optical line terminal, described optical network unit respectively.
A kind of passive optical network (pon) transmission method comprises step: aforesaid passive optical network (pon) adopts time-multiplexed broadcast mode transmission data at down direction, adopts the optical code division multiple access mode to transmit data at up direction.
Described passive optical network (pon) transmission method, wherein: at down direction, the data signal modulation that the optical transmitter of described optical line terminal will be finished time division multiplexing and will send to all optical network units sends to optical distribution network to light signal; Write the destination address of sign optical network unit in the data that optical line terminal passes down, optical distribution network is assigned to multifiber with light signal and sends each optical network unit to; The optical pickup apparatus of each optical network unit is converted to the signal of telecommunication with the light signal that the optical line terminal that receives sends to all optical network units, each optical network unit is only handled the data of issuing oneself according to the destination address information that receives in the packet, and other data are dropped.
Described passive optical network (pon) transmission method, wherein: at up direction, the multi wave length illuminating source of described optical network unit is multiple wavelength optical signal with electrical signal conversion and is sent to the light frequency multiplier, the light frequency multiplier is modulated into the spread spectrum light signal according to spectrum-spreading address code with multiple wavelength optical signal, and the spread spectrum light signal is sent to optical distribution network; The spread spectrum light signal of the different optical network units that optical distribution network will be received converges to an optical fiber and is sent to described optical line terminal; The light despreader of described optical line terminal receives the spread spectrum light signal, demodulates light signal according to spectrum-spreading address code, and sends corresponding light pulse sequence to photoelectric conversion module, and photoelectric conversion module is converted to the signal of telecommunication with light pulse sequence.
Adopt technical scheme of the present invention, owing to adopt the OCDMA mode to send data at up direction, make under the different wavelengths of light situation of equal number, the bandwidth that the number of users that system can hold and each user can use increases greatly, and the bandwidth of unique user is unrestricted, and the upstream bandwidth that can allow each user use simultaneously reaches megabit (Giga bit) easily; Because each user's data is modulated by spectrum-spreading address code, have only the same spectrum-spreading address code of use to carry out related operation at receiving terminal and could correctly receive data, and other user's light signal all is considered to noise, so the confidentiality and the fail safe of user data are very good, can under the situation that does not influence other user, carry out online detection simultaneously at the specific user; PON of the present invention system all is superior to traditional TDMA-PON system greatly in fail safe, confidentiality and online context of detection.
Description of drawings
The present invention includes following accompanying drawing:
Fig. 1 is a PON structural representation of the present invention;
Fig. 2 is ONU light sending device of the present invention and upstream data process of transmitting schematic diagram;
Fig. 3 is ONU optical pickup apparatus of the present invention and downlink data receiving course schematic diagram;
Fig. 4 is OLT optical receiver of the present invention and upstream data receiving course schematic diagram;
Fig. 5 is OLT optical transmitter of the present invention and downlink data process of transmitting schematic diagram;
Fig. 6 is the two-dimentional light frequency multiplier schematic diagram that the present invention is based on Bragg grating;
Fig. 7 is the light signal contrast schematic diagram of the present invention before and after light frequency multiplier spread spectrum;
Fig. 8 is the two-dimentional light despreader schematic diagram that the present invention is based on Bragg grating;
Fig. 9 is the light signal contrast schematic diagram of the present invention before and after the despreading of light despreader;
Figure 10 is the contrast schematic diagram of the light signal of different user of the present invention through light despreader despreading front and back.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail:
As shown in Figure 1, PON of the present invention system is made up of three parts: OLT, at least one ODN (Optical Distribute Network, optical distribution network) and at least one ONU, adopt optical fiber to connect between them.In order to narrate conveniently, will to be called down direction to the direction of ONU transmission data from OLT below, otherwise to be called up direction to the direction of OLT transmission data from ONU.
OLT has an optical transmitter, downlink data is modulated to sends to ODN on the light signal, and ODN is being assigned to multifiber from downlink optical signal and being sent on each ONU.Downlink data transmits and adopts broadcast mode, comprises the destination address that identifies ONU in the data that OLT passes down, and ONU only handles the data of issuing oneself according to the destination address information that receives in the packet.Rx is an optical receiver in OLT, and Tx is an optical transmitter; Because optical fiber of use between OLT and ODN, uplink and downlink signals are all therein, so the effect of light distributor is coupled to the light signal of up direction and down direction in this root optical fiber with regard to being.
At up direction, all ONU that belong to an ODN use the light of same group of wavelength to carry out the light band spectrum modulation when sending, simultaneously the spectrum-spreading address code (the ONU address code of up direction) of these ONU is all inequality, and the uplink optical signal of each ONU converges to the optical receiver that sends to OLT behind the optical fiber through ODN.As shown in Figure 2, the up light sending device of ONU comprises two parts: multi wave length illuminating source (for example multiple-wavelength laser or multi-wavelength laser array) and light frequency multiplier.The data-signal that multi wave length illuminating source will need to send is converted to multiple wavelength optical signal, modulation system is OOK (On-off keying, on-off keying) modulation, OOK modulation be exactly data during for " 1 " multi wave length illuminating source luminous, multi wave length illuminating source is not luminous during for " 0 ", and the light frequency multiplier uses fixed spectrum-spreading address code that this multi-wavelength light is carried out band spectrum modulation.As shown in Figure 3, the descending optical pickup apparatus of ONU comprises photodiode (changing light signal into the signal of telecommunication) and clock data recovery circuit (recovering clock signal and data-signal from the signal of telecommunication), at down direction, the light signal that the optical line terminal that receives is sent to all optical network units is converted to the signal of telecommunication, optical network unit is only handled the data of issuing oneself according to the destination address information that receives in the packet, and other data are dropped.
The receiving terminal of OLT is made up of a group of receivers, and wherein each receiver receives the light signal corresponding to a kind of spectrum-spreading address code, and the receiving terminal of OLT must be able to be handled the spread spectrum light signal that all ONU send.As shown in Figure 4, each receiver comprises two parts: light despreader and photoelectric conversion module.The light despreader will adopt the light signal demodulation of certain spectrum-spreading address code modulation to come out to become light pulse sequence and send photoelectric conversion module to, and this photoelectric conversion module is converted to the signal of telecommunication with light pulse sequence.As shown in Figure 5, at down direction, the data-signal in the optical line terminal is at first finished time division multiplexing in electric territory, and the laser in the OLT optical transmitter will have been finished the time-multiplexed signal of telecommunication and be modulated to light signal and send to optical distribution network.
Light frequency multiplier and light despreader among the present invention can have multiple implementation, the two-dimentional OCDMA modulation when a kind of implementation wherein realizes light frequency hopping and expansion for using Bragg fiber grating (FBG).In fact the light despreader of FBG structure is almost completely the same with the light frequency multiplier, is equivalent to the input/output interface transposing with light signal.
Fig. 6 is based on the two-dimentional light frequency multiplier of Bragg grating, the light signal of Bragg grating reflection specific wavelength wherein.Wavelength among Fig. 6 puts in order and the time-delay between them has just constituted two-dimentional light spectrum-spreading address code (the hypothesis spectrum-spreading address code is 132 among Fig. 6).The operation principle of this light frequency multiplier is as follows: after entering grating through the multiple wavelength optical signal after the OOK modulation through circulator, the light of different wave length is through exporting by optical grating reflection and through circulator respectively after the different time-delays, and the bit in the baseband signal " 1 " has just become one group of light pulse signal like this.As can be seen from Figure 7, the light signal of all wavelengths all is modulated to light pulse by base electrical signal before the spread spectrum, they are consistent in time, and through behind the light frequency multiplier, the wavelength light that does not have in the spectrum-spreading address code is absorbed by light absorber, and has been formed a string light pulse by the wavelength light pulse that spectrum-spreading address code is chosen through the time-delay arrangement, compared with the light signal before the spread spectrum, obviously signal has obtained expansion on time domain, therefore Here it is so-called smooth spread spectrum.
Fig. 8 is based on the two-dimentional light despreader of Bragg grating, and the spectrum-spreading address code that it uses is the same with the spectrum-spreading address code among Fig. 4.After the time-delay reflection of spread spectrum light signal through despreader, the light pulse of different wave length stacks up at synchronization, and it is maximum that light intensity reaches, and can be received and be converted to the signal of telecommunication by photoelectric conversion module.Light signal contrast before and after the despreading of light despreader as shown in Figure 9.
And other user's (promptly using the user of other spectrum-spreading address code) light signal equally also can enter the light despreader, will cause interference like this, as can be seen from Figure 10, supposing to have a spectrum-spreading address code is after 425 light signal enters the light despreader, at first the light pulse of wavelength 4 and wavelength 5 is absorbed by light absorber, and have only the light pulse of wavelength 2 to be reflected out, and these two users' light signal can not arrive the light despreader simultaneously, become a light pulse that amplitude is smaller behind therefore final this user's the light signal process light despreader, like this as long as a light intensity threshold value is set in photoelectric conversion module, the light pulse of having only light intensity to surpass this threshold value just is converted into the signal of telecommunication, and the signal that just can successfully eliminate other user disturbs.Certainly when having a plurality of user in the fiber channel, phase mutual interference between the user will be more complicated more and serious than foregoing description far away, we can adopt and improve spectrum-spreading address code sign indicating number type (as increasing code length, adopting bipolar coding), reduce light impulse length, increase light emitting power, adopt balance to receive even adopt technological means such as relevant modulation to overcome interference.
Though pass through with reference to the preferred embodiments of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (10)
1, a kind of optical network unit, comprise light sending device and optical pickup apparatus, it is characterized in that: light sending device comprises multi wave length illuminating source and light frequency multiplier, multi wave length illuminating source links to each other with the light frequency multiplier, multi wave length illuminating source is used for electrical signal conversion to be multiple wavelength optical signal and to be sent to the light frequency multiplier, the light frequency multiplier is used for according to spectrum-spreading address code multiple wavelength optical signal being modulated into the spread spectrum light signal, and sends the spread spectrum light signal.
2, optical network unit according to claim 1 is characterized in that: the light frequency multiplier is made as the two-dimentional light frequency multiplier based on Bragg grating.
3, optical network unit according to claim 2 is characterized in that: multi wave length illuminating source is made as multiple-wavelength laser or multi-wavelength laser array.
4, optical network unit according to claim 3 is characterized in that: the signal modulation system of multi wave length illuminating source is made as the on-off keying modulation system.
5, a kind of optical line terminal, comprise at least one optical receiver, light distributor and optical transmitter, light distributor links to each other with optical receiver, optical transmitter respectively, it is characterized in that: optical receiver comprises light despreader, photoelectric conversion module, the light despreader links to each other with photoelectric conversion module, the light despreader is used to receive the spread spectrum light signal, demodulate light signal according to spectrum-spreading address code, and sending corresponding light pulse sequence to photoelectric conversion module, photoelectric conversion module is used for light pulse sequence is converted to the signal of telecommunication.
6, optical line terminal according to claim 5 is characterized in that, optical receiver is made as the two-dimentional light despreader based on Bragg grating.
7, a kind of passive optical network (pon), it is characterized in that, comprise optical line terminal as claimed in claim 5, at least one optical distribution network, at least one is as the arbitrary described optical network unit of claim 1 to 4, optical distribution network links to each other with described optical line terminal, described optical network unit respectively.
8, a kind of passive optical network (pon) transmission method, it is characterized in that, comprise step: passive optical network (pon) as claimed in claim 7 adopts time-multiplexed broadcast mode transmission data at down direction, adopts the optical code division multiple access mode to transmit data at up direction.
9, passive optical network (pon) transmission method according to claim 8, it is characterized in that: at down direction, the data signal modulation that the optical transmitter of described optical line terminal will be finished time division multiplexing and will send to all optical network units sends to optical distribution network to light signal; Write the destination address of sign optical network unit in the data that optical line terminal passes down, optical distribution network is assigned to multifiber with light signal and sends each optical network unit to; The optical pickup apparatus of each optical network unit is converted to the signal of telecommunication with the light signal that the optical line terminal that receives sends to all optical network units, each optical network unit is only handled the data of issuing oneself according to the destination address information that receives in the packet, and other data are dropped.
10, passive optical network (pon) transmission method according to claim 9, it is characterized in that: at up direction, the multi wave length illuminating source of described optical network unit is multiple wavelength optical signal with electrical signal conversion and is sent to the light frequency multiplier, the light frequency multiplier is modulated into the spread spectrum light signal according to spectrum-spreading address code with multiple wavelength optical signal, and the spread spectrum light signal is sent to optical distribution network; The spread spectrum light signal of the different optical network units that optical distribution network will be received converges to an optical fiber and is sent to described optical line terminal; The light despreader of described optical line terminal receives the spread spectrum light signal, demodulates light signal according to spectrum-spreading address code, and sends corresponding light pulse sequence to photoelectric conversion module, and photoelectric conversion module is converted to the signal of telecommunication with light pulse sequence.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100340297A CN101030822B (en) | 2006-02-27 | 2006-02-27 | Optical network unit, optical line terminal, passive fiber-optic access network and its transmission |
| PCT/CN2006/003483 WO2007095813A1 (en) | 2006-02-27 | 2006-12-19 | An optical network unit, an optical line terminal and a passive optical network with its transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100340297A CN101030822B (en) | 2006-02-27 | 2006-02-27 | Optical network unit, optical line terminal, passive fiber-optic access network and its transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101030822A true CN101030822A (en) | 2007-09-05 |
| CN101030822B CN101030822B (en) | 2012-02-01 |
Family
ID=38436928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100340297A Active CN101030822B (en) | 2006-02-27 | 2006-02-27 | Optical network unit, optical line terminal, passive fiber-optic access network and its transmission |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101030822B (en) |
| WO (1) | WO2007095813A1 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143413A (en) * | 2011-03-28 | 2011-08-03 | 上海交通大学 | Time division multiplexing (TDM) passive optical network (PON) upgrade system and transmission method thereof |
| CN101820352B (en) * | 2009-11-03 | 2012-05-23 | 上海大学 | System and method of wavelength division multiplexing passive optical network for realizing broadcast functions |
| CN103188578A (en) * | 2011-12-30 | 2013-07-03 | 北京同步科技有限公司 | Exchange board, optical communication device, and data communication method |
| CN103257114A (en) * | 2013-05-08 | 2013-08-21 | 安徽理工大学 | Underground gas detecting method based on optical fiber Bragg grating sensor network |
| CN105320876A (en) * | 2014-07-29 | 2016-02-10 | 王王道 | Photoelectric conversion authentication system |
| CN105450575A (en) * | 2015-10-05 | 2016-03-30 | 上海大学 | Energy-saving transmission method of downlink data of OFDM-PON |
| CN105634643A (en) * | 2016-01-27 | 2016-06-01 | 中国人民解放军国防科学技术大学 | Fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging |
| WO2018068205A1 (en) * | 2016-10-11 | 2018-04-19 | 华为技术有限公司 | Demultiplexing method and apparatus for code division multiplexing |
| CN108418632A (en) * | 2017-02-10 | 2018-08-17 | 上海诺基亚贝尔股份有限公司 | Device and method for integrating passive optical local area network business and wireless indoor business |
| CN112261515A (en) * | 2020-10-24 | 2021-01-22 | 青岛鼎信通讯股份有限公司 | Optical fiber breakpoint splicing method based on medium-voltage carrier |
| CN113037678A (en) * | 2021-02-26 | 2021-06-25 | 江苏科大亨芯半导体技术有限公司 | Method for marking optical fiber wavelength |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008301153A (en) * | 2007-05-31 | 2008-12-11 | Oki Electric Ind Co Ltd | Passive optical network communication method and system |
| CN101820339B (en) * | 2010-04-02 | 2012-11-28 | 南昌航空大学 | Method for extracting all-optical bit clock of domain OCDMA (Optical Code Division Multiple Access) system under multi-user environment |
| CN105790851A (en) * | 2015-11-27 | 2016-07-20 | 深圳大学 | Optical network broadband access system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867290A (en) * | 1996-11-19 | 1999-02-02 | Rdl Commercial Technologies Corporation | High capacity spread spectrum optical communications system |
| EP1099319A1 (en) * | 1999-05-17 | 2001-05-16 | Codestream Technologies Corporation | Photonic integrated circuit for optical cdma |
| CN1133289C (en) * | 2001-11-15 | 2003-12-31 | 上海交通大学 | Code overlapped fast hopping optical CDMA access system |
| KR100628295B1 (en) * | 2003-11-11 | 2006-09-27 | 한국전자통신연구원 | Two-dimensional wavelength/time optical CDMA system adopting balanced-modified pseudo random noise matrix codes |
| CN1725721A (en) * | 2005-07-19 | 2006-01-25 | 电子科技大学 | Passive optical network based on optical CDMA multitechnology |
-
2006
- 2006-02-27 CN CN2006100340297A patent/CN101030822B/en active Active
- 2006-12-19 WO PCT/CN2006/003483 patent/WO2007095813A1/en active Application Filing
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820352B (en) * | 2009-11-03 | 2012-05-23 | 上海大学 | System and method of wavelength division multiplexing passive optical network for realizing broadcast functions |
| CN102143413A (en) * | 2011-03-28 | 2011-08-03 | 上海交通大学 | Time division multiplexing (TDM) passive optical network (PON) upgrade system and transmission method thereof |
| CN103188578B (en) * | 2011-12-30 | 2016-06-01 | 北京同步科技有限公司 | Switch, optical communication equipment and data communication method |
| CN103188578A (en) * | 2011-12-30 | 2013-07-03 | 北京同步科技有限公司 | Exchange board, optical communication device, and data communication method |
| CN103257114A (en) * | 2013-05-08 | 2013-08-21 | 安徽理工大学 | Underground gas detecting method based on optical fiber Bragg grating sensor network |
| CN105320876A (en) * | 2014-07-29 | 2016-02-10 | 王王道 | Photoelectric conversion authentication system |
| CN105450575A (en) * | 2015-10-05 | 2016-03-30 | 上海大学 | Energy-saving transmission method of downlink data of OFDM-PON |
| CN105450575B (en) * | 2015-10-05 | 2019-08-20 | 上海大学 | A kind of OFDM-PON downlink data power save transmission method |
| CN105634643A (en) * | 2016-01-27 | 2016-06-01 | 中国人民解放军国防科学技术大学 | Fiber time and frequency transfer method, device and system based on bidirectional spread spectrum ranging |
| CN105634643B (en) * | 2016-01-27 | 2018-02-02 | 中国人民解放军国防科学技术大学 | A kind of optical fiber time Frequency Transfer method, apparatus and system based on two-way spread spectrum ranging |
| WO2018068205A1 (en) * | 2016-10-11 | 2018-04-19 | 华为技术有限公司 | Demultiplexing method and apparatus for code division multiplexing |
| CN108418632A (en) * | 2017-02-10 | 2018-08-17 | 上海诺基亚贝尔股份有限公司 | Device and method for integrating passive optical local area network business and wireless indoor business |
| CN112261515A (en) * | 2020-10-24 | 2021-01-22 | 青岛鼎信通讯股份有限公司 | Optical fiber breakpoint splicing method based on medium-voltage carrier |
| CN113037678A (en) * | 2021-02-26 | 2021-06-25 | 江苏科大亨芯半导体技术有限公司 | Method for marking optical fiber wavelength |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2007095813A1 (en) | 2007-08-30 |
| CN101030822B (en) | 2012-02-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101030822B (en) | Optical network unit, optical line terminal, passive fiber-optic access network and its transmission | |
| EP1458214B1 (en) | Passive optical network employing code division multiple acces | |
| Yin et al. | Optical code division multiple access communication networks | |
| US5760941A (en) | System and method for performing optical code division multiple access communication using bipolar codes | |
| CN103840882A (en) | Transmitting system, receiving system and communication system of optical fiber network, and signal modulation method | |
| US7200342B2 (en) | Direct-sequence spread-spectrum optical-frequency-shift-keying code-division-multiple-access communication system | |
| US7272318B2 (en) | Passive optical network employing multi-carrier code division multiple access | |
| CN101902666A (en) | Optical code-division multiple-access (OCDMA) passive optical network system, optical distribution network device and optical line terminal | |
| WO2013015859A2 (en) | Optical receiver configurable to accommodate a variety of modulation formats | |
| Ahn et al. | A symmetric-structure CDMA-PON system and its implementation | |
| AU1680899A (en) | Concatenated codes for spread spectrum communication | |
| Kwong et al. | Ultrafast all-optical code-division multiple-access (CDMA) fiber-optic networks | |
| CN104363532B (en) | The method and system of colourless unglazed optical network unit is used in Optical Access Network | |
| CN115189715B (en) | Optical transmission device and method based on direct spread spectrum time division multiplexing | |
| Blinowski et al. | LuxSteg: First practical implementation of steganography in VLC | |
| US20020126349A1 (en) | Multiplexing information on multiple wavelengths in optical systems | |
| US20100124420A1 (en) | Communication device and communication method | |
| CN114944868B (en) | Top adjusting system of passive optical network | |
| CN1129870A (en) | Improved subcarrier multiple access passive optical network | |
| Karbassian et al. | Frequency‐shift keying optical code‐division multiple‐access system with novel interference cancellation | |
| Jin et al. | Experimental demonstration of hybrid OFDM-digital filter multiple access PONs for 5G and beyond networks | |
| Bakarman et al. | Simulation of MQC code for optical CDMA PON system | |
| Kai-Sheng | Wavelength reuse for two-direction transmissions of optical CDMA signals on radio-over-fiber application | |
| Runser | Optical CDMA Network Architectures and Applications | |
| Elfadel et al. | Reducing the Hardware Complexity and Processing Time of Optical Parallel Interference Cancellation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |