CN104113375A - Optical communication transmitting end, receiving end, system and data transmitting and receiving method - Google Patents
Optical communication transmitting end, receiving end, system and data transmitting and receiving method Download PDFInfo
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- CN104113375A CN104113375A CN201410275504.4A CN201410275504A CN104113375A CN 104113375 A CN104113375 A CN 104113375A CN 201410275504 A CN201410275504 A CN 201410275504A CN 104113375 A CN104113375 A CN 104113375A
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Abstract
The invention relates to the field of optical communication and discloses an optical communication transmitting end, a receiving end, a system and a data transmitting and receiving method. In the optical communication transmitting end or the receiving end, an optical filter is adopted for carrying out asymmetric filtering on signals of a user. Compared with the prior art, the transmission performance of the system can be improved when an optical filter group is located at the transmitting end or the receiving end, and the prior communication system structure is not changed, the cost is low, and realization is easy.
Description
Technical field
The present invention relates to optical communication field, particularly the transmitting terminal of optical communication, receiving terminal, system and data input and data output method thereof.
Background technology
At present, in order to realize the short-range signal transmission of high speed, promote single channel transmission rate, the transmitting terminal of communication system adopts no-load wave amplitude to modulate mutually (Carrierless Amplitude/phase Modulation conventionally, abbreviation CAP) transmitter transmits, and exports receiving terminal to by optical fiber.Wherein, no-load wave amplitude phase modulation transmitter comprises encoder for each user's signal is encoded and for being modulated to the directly modulated lasers of the light signal of generation through signal coding, user.
Yet, due to the impact that directly modulated lasers is warbled with optical fiber dispersion, seriously limited the speed of telecommunication transmission system.
Summary of the invention
The object of the present invention is to provide a kind of transmitting terminal, receiving terminal, system and data input and data output method thereof of optical communication, can improve transmission performance and the speed of system, and cost is low, be easy to realize.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of transmitting terminal of optical communication, comprise: CAP transmitter and optical filter; Transmitting of described CAP transmitter sends to receiving terminal after described optical filter carries out asymmetric filtering.
Embodiments of the present invention also provide a kind of receiving terminal of optical communication, comprise: optical filter, photo-detector and decoding demodulator;
The signal of described optical filter spontaneous emission in the future end carries out direct detection by described photo-detector to filtered light signal, and is converted to the signal of telecommunication after carrying out asymmetric filtering; Described decoding demodulator is to the demodulation of decoding of the described signal of telecommunication.
Embodiments of the present invention also provide a kind of optical communication system, comprise: the transmitting terminal of above-mentioned optical communication;
Or, the receiving terminal of above-mentioned optical communication.
Embodiments of the present invention also provide a kind of data transmission method for uplink of optical communication, comprise following steps:
By transmitting terminal, the signal of transmitting is carried out sending after asymmetric filtering.
Embodiments of the present invention also provide a kind of data receive method of optical communication, comprise following steps:
Signal transmitting terminal being sent by receiving terminal carries out asymmetric filtering;
Asymmetric filtered signal is carried out to direct detection, and be converted to the signal of telecommunication;
To the demodulation of decoding of the described signal of telecommunication.
Embodiment of the present invention in terms of existing technologies, no matter optical filter is positioned at transmitting terminal or the receiving terminal of optical communication, can suppress the frequency of warbling that the built-in directly modulated lasers of CAP transmitter in transmitting terminal produces, increase the eye opening of modulation signal, thereby improve the transmission performance of system; And, owing to suppressing the frequency of warbling of directly modulated lasers generation, the filter effect of optical filter is not symmetrical for the double-sideband signal producing because of light up-conversion, destroyed the symmetry of double-sideband signal, thereby the distortion that in the time of can weakening direct detection, dispersion is introduced, realizes the communication of system higher rate; Meanwhile, do not change existing communication system configuration, directly at transmitting terminal or receiving terminal, introduce optical filter group, cost is low, is easy to realize.
In addition, described optical filter can be band pass filter, can be also band stop filter.Like this, guaranteed the flexibility of embodiment of the present invention.
Accompanying drawing explanation
Fig. 1 is the transmitting terminal structural representation according to the optical communication of first embodiment of the invention;
Fig. 2 is the schematic diagram that affects on systematic function according to the parameter of the optical filter in first embodiment of the invention;
Fig. 3 is the receiving terminal structural representation according to the optical communication of second embodiment of the invention;
Fig. 4 is the optical communication system structural representation according to third embodiment of the invention;
Fig. 5 is the optical communication system structural representation according to four embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.Yet, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, in order to make reader understand the application better, many ins and outs have been proposed.But, even without these ins and outs and the many variations based on following execution mode and modification, also can realize each claim of the application technical scheme required for protection.
The first execution mode of the present invention relates to a kind of transmitting terminal of optical communication, comprises: CAP transmitter and optical filter; Transmitting of CAP transmitter sends to receiving terminal after optical filter carries out asymmetric filtering.
In the present embodiment, the transmitting terminal of optical communication, specifically as shown in Figure 1, comprise: N user's CAP transmitter, optical filter group 101 and wavelength division multiplexer 102, wherein, N is natural number, and optical filter group 101 comprises N optical filter 1011, and one end of each optical filter 1011 is connected correspondingly with user's CAP transmitter, and the other end is all connected with wavelength division multiplexer 102.
Specifically, each user's CAP transmitter carries out to the signal of respective user that no-load wave amplitude is modulated mutually and multistage coding, and wherein, user's signal is the light signal that carries user profile.Each user's signal is carried out to multistage coding, and the no-load wave amplitude carrying out based on direct modulator (not shown) modulates mutually, to improve the bit rate of transmission.Such as, in present embodiment, the CAP transmitter that transmitting terminal comprises N user, be user 1 CAP transmitter, user 2 CAP transmitter ..., user N CAP transmitter, user 1 CAP transmitter is modulated and multistage coding mutually to user 1 signal no-load wave amplitude, user 2 CAP transmitter is modulated and multistage coding mutually to user 2 signal no-load wave amplitude ..., the CAP transmitter of user N is modulated and multistage coding mutually to the signal no-load wave amplitude of user N.
The signal of 101 pairs of receptions of optical filter group carries out asymmetric filtering.Specifically, be that each optical filter 1011 in optical filter group 101 carries out asymmetric filtering to the received signal, and the signal after asymmetric filtering is processed all export wavelength division multiplexer 102 to.
In the present embodiment, optical filter 1011 can be band pass filter.Band pass filter (band-pass filter) only allows the signal of special frequency channel to pass through, and shields the signal of other frequency ranges simultaneously.Such as, with user 1 the corresponding connected band pass filter of CAP transmitter, the signal of characteristic frequency that only allows to carry user 1 information passes through, and shields the signal of other frequencies, like this, can eliminate interference, improves the performance of signal transmission.
Because the carrier concentration of the built-in DFB-LD of CAP transmitter (distributed feedback laser) is subject to the impact of drive current, when DFB-LD is carried out to intensity modulated, inevitably introduced and warbled, thereby make straight tonal signal except being subject to amplitude modulation(PAM), follow in addition frequency modulation(FM), cause output spectrum broadening.When direct intensity modulation, due to the existence of adiabatic chirp, the transient state output wavelength during with 1 yard is different at 0 yard to make laser.When modulation signal is 0 yard, laser output wavelength is positioned at long wavelength's one side; When modulation signal is 1 yard, laser output wavelength blue shift.Under direct modulation condition, the output spectrum of distributed feedback laser is two peak structure, and linewidth enhancement factor, adiabatic chirp coefficient and the external drive size of current of the decisions such as the material of distributed feedback laser own depended in its wavelength interval.Because the spectrum widening of directly modulated lasers, causes user's signal generation distortion, and user's signal is through after Optical Fiber Transmission, and the impact that is subject to optical fiber dispersion is larger.Asymmetric filtering technique is utilizes 1011 couples of users' of general optical filter signal spectrum to carry out shaping.Due to the existence of the frequency displacement of warbling, the centre wavelength of optical filter 1011 and signal wavelength have certain skew, thereby are called asymmetric.
Because 101 pairs of signals of optical filter group carry out asymmetric filtering, can suppress the frequency of warbling that the built-in directly modulated lasers of the CAP transmitter of N user in transmitting terminal produces, increase the eye opening of modulation signal, thereby improve the transmission performance of system; And, owing to suppressing the frequency of warbling of directly modulated lasers (not shown) generation, the filter effect of optical filter 1011 is not symmetrical for the double-sideband signal producing because of light up-conversion, destroyed the symmetry of double-sideband signal, thereby can weaken the receiving terminal distortion that dispersion is introduced when adopting direct detection mode, realize the communication of system higher rate; Meanwhile, owing to not changing the structure of existing communication system, directly at transmitting terminal, introduce optical filter group 101, cost is low, is easy to realize.
After merging, 102 couples of N of wavelength division multiplexer asymmetric filtered signals export receiving terminal to by optical fiber 103.In the present embodiment, wavelength division multiplexer 102 merges together filtered signal N kind different wave length, asymmetric (being optical carrier), and is coupled in optical fiber 103 and transmits.Wavelength division multiplexer 102 is devices of existing maturation, does not repeat them here.
Further, in order to improve the transmission rate of system, conventionally can adopt high order modulation.Due to asymmetric filtering technique only filtering the frequency of warbling, can't bring damage to user's signal spectrum, thereby in the present invention, transmitting terminal is transparent to order of modulation, namely, all applicable to various order of modulation, practical.
In addition, optical filter can also be band stop filter.Band stop filter can allow the ripple of specific frequency components to pass through, but by the wave attenuation of other frequency components to extremely low-level, can reduce the interference to useful signal, improve the transmission performance of signal, guaranteed the flexibility of embodiment of the present invention.
Wherein, the parameter of band pass filter and band stop filter on the impact of systematic function as shown in Figure 2.Wherein, transverse axis is frequency shift (FS), unit is gigahertz (GHZ) (GHz), the longitudinal axis is the error rate, 201 transmission back-to-back (BTB) that are band pass filter, 202 transmission back-to-back (BTB) that are band stop filter, 203 is the transmission of band pass filter after 15km, 204 is the transmission of band stop filter after 15km, wherein, transmits without Transmission Fibers back-to-back.In addition, as shown in Figure 2, the performance of band pass filter and band stop filter is close, can not be subject to the impact of transmission link.
Compared with prior art, optical filter can suppress the frequency of warbling that in transmitting terminal, the built-in directly modulated lasers of CAP transmitter produces, and increases the eye opening of modulation signal, thereby improves the transmission performance of system; And, can realize the communication of system higher rate; Meanwhile, do not change existing communication system configuration, cost is low, is easy to realize.
The second execution mode of the present invention relates to a kind of receiving terminal of optical communication, comprises: optical filter, photo-detector and decoding demodulator; The signal of optical filter spontaneous emission in the future end carries out direct detection by photo-detector to filtered light signal, and is converted to the signal of telecommunication after carrying out asymmetric filtering; Decoding demodulator is to the signal of telecommunication demodulation of decoding.
In the present embodiment, the receiving terminal of optical communication, specifically as shown in Figure 3, comprise: demodulation multiplexer 301, optical filter group 101, a N photo-detector and N decoding demodulator, optical filter group 101 comprises N optical filter 1011, and wherein, optical filter 1011, photo-detector and decoding demodulator are corresponding one by one, and one end of each optical filter 1011 is all connected with demodulation multiplexer 301, the other end is connected correspondingly with photo-detector.The optical carrier of the N kind wavelength of 1011 pairs of demodulation multiplexers of each optical filter, 301 outputs carries out asymmetric filtering, and exports corresponding photo-detector to.
In the present embodiment, optical filter 1011 can be band pass filter.Band pass filter only allows the signal of special frequency channel to pass through, and shields the signal of other frequency ranges simultaneously.Like this, can eliminate interference, improve the performance of signal transmission.
In addition, optical filter can also be band stop filter.Band stop filter can allow the ripple of specific frequency components to pass through, but by the wave attenuation of other frequency components to extremely low-level, can reduce the interference to useful signal, improve the transmission performance of signal, guaranteed the flexibility of embodiment of the present invention.
Compared with prior art, optical filter group 101 is carried out asymmetric filtering at receiving terminal to signal, can suppress equally the frequency of warbling that in transmitting terminal, the built-in directly modulated lasers of CAP transmitter produces, increase the eye opening of modulation signal, thereby improve the transmission performance of system; And, owing to having suppressed the frequency of warbling that directly modulated lasers (not shown) produces, the filter effect of optical filter 1011 is not symmetrical for the double-sideband signal producing because of light up-conversion, destroyed equally the symmetry of double-sideband signal, thereby can weaken the receiving terminal distortion that dispersion is introduced when adopting direct detection mode, realize the communication of system higher rate; Meanwhile, also do not change the structure of existing communication system, can directly at receiving terminal, introduce optical filter group 101, cost is low, is easy to realize.
It should be noted that, no matter optical filter group is positioned at transmitting terminal or receiving terminal, can suppress the frequency of warbling that in transmitting terminal, the built-in directly modulated lasers of CAP transmitter produces, and increases the eye opening of modulation signal, thereby improves the transmission performance of system; And, can realize the communication of system higher rate; Meanwhile, do not change existing communication system configuration, cost is low, is easy to realize.
The 3rd execution mode of the present invention relates to a kind of optical communication system, specifically as shown in Figure 4, comprises: the receiving terminal of CAP communication and the transmitting terminal of the optical communication in the first execution mode.
Be not difficult to find, present embodiment is the system embodiment corresponding with the first execution mode, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
Four embodiment of the invention relates to a kind of optical communication system, as shown in Figure 5, comprises: the transmitting terminal of CAP communication and the receiving terminal of the optical communication in the second execution mode.
Be not difficult to find, present embodiment is the system embodiment corresponding with the second execution mode, present embodiment can with the enforcement of working in coordination of the second execution mode.The correlation technique details of mentioning in the second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the second execution mode.
The 5th execution mode of the present invention relates to a kind of data transmission method for uplink of optical communication, comprises following steps: by transmitting terminal, the signal of transmitting is carried out sending after asymmetric filtering.
Be not difficult to find, present embodiment is the embodiment of the method corresponding with the first execution mode, present embodiment can with the enforcement of working in coordination of the first execution mode.The correlation technique details of mentioning in the first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the first execution mode.
The 6th execution mode of the present invention relates to a kind of data receive method of optical communication, comprises following steps:
Step 601, signal transmitting terminal being sent by receiving terminal carries out asymmetric filtering.
Step 602, carries out direct detection to asymmetric filtered signal, and is converted to the signal of telecommunication.
Step 603, to the signal of telecommunication demodulation of decoding.
Be not difficult to find, present embodiment is the embodiment of the method corresponding with the second execution mode, present embodiment can with the enforcement of working in coordination of the second execution mode.The correlation technique details of mentioning in the second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in present embodiment also can be applicable in the second execution mode.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above are to realize specific embodiments of the invention, and in actual applications, can to it, do various changes in the form and details, and without departing from the spirit and scope of the present invention.
Claims (9)
1. a transmitting terminal for optical communication, is characterized in that, comprises: CAP transmitter and optical filter; Transmitting of described CAP transmitter sends to receiving terminal after described optical filter carries out asymmetric filtering.
2. the transmitting terminal of optical communication according to claim 1, is characterized in that, the number of described CAP transmitter and described optical filter is N, and described N is natural number; Described CAP transmitter and described optical filter are corresponding one by one;
Described transmitting terminal also comprises wavelength division multiplexer;
Described in each, CAP transmitter carries out to the signal of respective user that no-load wave amplitude is modulated mutually and multistage coding; After optical filter carries out asymmetric filtering to transmitting of corresponding CAP transmitter described in each, be sent to described wavelength division multiplexer; Described wavelength division multiplexer merges N filtered signal, and sends to receiving terminal by optical fiber.
3. the transmitting terminal of optical communication according to claim 1, is characterized in that, described optical filter is band pass filter or band stop filter.
4. a receiving terminal for optical communication, is characterized in that, comprises: optical filter, photo-detector and decoding demodulator;
The signal of described optical filter spontaneous emission in the future end carries out direct detection by described photo-detector to filtered light signal, and is converted to the signal of telecommunication after carrying out asymmetric filtering; Described decoding demodulator is to the demodulation of decoding of the described signal of telecommunication.
5. the receiving terminal of optical communication according to claim 4, is characterized in that, the number of described optical filter, described photo-detector and described decoding demodulator is N, and described N is natural number; Described optical filter, described photo-detector and described decoding demodulator are corresponding one by one;
Described receiving terminal also comprises: demodulation multiplexer;
Described demodulation multiplexer carries out demultiplexing to the combined signal receiving; After optical filter carries out asymmetric filtering to described demultiplexed signal described in each, be sent to corresponding photo-detector.
6. the receiving terminal of optical communication according to claim 4, is characterized in that, described optical filter is band pass filter or band stop filter.
7. an optical communication system, is characterized in that, comprises: the transmitting terminal of the optical communication as described in claims 1 to 3;
Or, the receiving terminal of the optical communication as described in claim 4 to 5.
8. a data transmission method for uplink for optical communication, is characterized in that, comprises following steps:
By transmitting terminal, the signal of transmitting is carried out sending after asymmetric filtering.
9. a data receive method for optical communication, is characterized in that, comprises following steps:
Signal transmitting terminal being sent by receiving terminal carries out asymmetric filtering;
Asymmetric filtered signal is carried out to direct detection, and be converted to the signal of telecommunication;
To the demodulation of decoding of the described signal of telecommunication.
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