CN1466276A - High-speed optical return-to-zero code non-return-to-zero convertion receiver and receiving method - Google Patents
High-speed optical return-to-zero code non-return-to-zero convertion receiver and receiving method Download PDFInfo
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- CN1466276A CN1466276A CNA021246394A CN02124639A CN1466276A CN 1466276 A CN1466276 A CN 1466276A CN A021246394 A CNA021246394 A CN A021246394A CN 02124639 A CN02124639 A CN 02124639A CN 1466276 A CN1466276 A CN 1466276A
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Abstract
This invention discloses a receiving device and a method for a high speed light coding non-return-to zero conversion including detecting coding light signal by a photo-electric detection device to turn it to electric and input it to a filter which converts it to a mixed electric signal between the coding and non-return-to zero code and send it to limiter amplifier limiting amplitude and amplifying to convert it a non-return-to-zero code signal. This invention utilizes the advantage of a simple filter plan without high speed clock and adds a first level of high sensitive limiting amplifier to convert it to NRZ code to increase its senmsitivity.
Description
Technical field:
The present invention relates to a kind of extra long distance make zero non-return-to-zero (NRZ) the conversion receiving system and method for (RZ) sign indicating number optical transmission system of being applicable to.
Background technology:
In the over distance optical transmission system, optical link sign indicating number type adopts NRZ usually, i.e. the RZ sign indicating number.Typical R Z sign indicating number transmission system such as Fig. 1.
Corresponding with NRZ is nonreturn to zero code, and promptly the NRZ sign indicating number is applied in the electric layer function module.NRZ and nonreturn to zero code difference are referring to Fig. 2, and in a code-element period, the logical one of NRZ has experienced the change procedure of 0-1-0, and nonreturn to zero code then keeps 1 always.
The emphasis that the correlation technique of existing RZ sign indicating number optical transmission system is paid close attention to mainly concentrates on RZ sign indicating number transmitting terminal and the optical transmission section, as inhibition carrier frequency technology about RZ, the prechirp technology of RZ sign indicating number and the optimization of RZ code system etc., and to the receiver module shorter mention of RZ sign indicating number.Its reason is mainly both ways:
The first, the clock and data recovery chip all can correctly be worked under RZ and NRZ sign indicating number type condition in the electric layer function module, and therefore existing other RZ code systems do not carry out particular design to RZ sign indicating number receiver module.Yet, directly deliver to an electricity layer module and handle if in photoelectric conversion process, the RZ sign indicating number is not carried out NRZ conversion, can be because the duty ratio less (comparison diagram 2a and Fig. 2 b) of RZ sign indicating number, and cause certain cost, this is disadvantageous to improving tolerance limit, the especially jitter toleration of whole system.
The second, the technology that existing RZ is converted to NRZ can not directly be applied on the receiver module.As adopt the d type flip flop scheme, and theory diagram is seen Fig. 3, and concerning high-speed optical transmission system, this d type flip flop or very expensive perhaps can't be made because of speed is too high at all, and requisite high-frequency clock also is difficult to obtain in this in addition scheme.Also have a kind of simple relatively conversion plan, be about to the RZ sign indicating number by the Gaussian low pass filter, the filtering radio-frequency component makes it directly be converted to NRZ sign indicating number type.
Figure 4 shows that existing a kind of RZ is converted to the filter of NRZ and the eye pattern of output.The three dB bandwidth of this filter is 3/8 of bit rate, thereby can comparatively successfully recover NRZ sign indicating number type, exactly because but also bandwidth is lower, and make input signal lose the part high-frequency energy, thereby it is very big to cause inserting loss, is unsuitable for the RZ Optical Receivers.
Summary of the invention:
Purpose of the present invention is exactly in order to overcome the above problems, and a kind of high-speed optical return-to-zero code non-return-to-zero conversion receiving system and method are provided, and is easy to realize, can directly apply on the receiver module, and the insertion loss is little, highly sensitive.
For achieving the above object, the present invention proposes a kind of high-speed optical return-to-zero code non-return-to-zero conversion receiving system and method.
Described high-speed optical return-to-zero code non-return-to-zero conversion receiving system comprises the photoelectric detection system that input links to each other with nrz optical signal, it is characterized in that: also comprise the filter, the limiting amplifier that link to each other successively, the output of the input termination photoelectric detection system of described filter, the output of limiting amplifier is the output of resulting nonreturn to zero code.
Described high-speed optical return-to-zero code non-return-to-zero conversion method of reseptance comprises the steps: it to be become the signal of telecommunication be input to filter by the nrz optical signal on the photoelectric detection system detection line; Filter is the mixing signal of telecommunication between NRZ and nonreturn to zero code with conversion of signals, sends into limiting amplifier; Limiting amplifier carries out amplitude limit to signal and amplifies, and becomes the nonreturn to zero code signal.
Owing to adopted above scheme, utilize the advantage that the filter scheme is simple, easily realize, do not need high-frequency clock, increasing the judgement of one-level high sensitivity limiting amplifier simultaneously amplifies, be converted to standard NRZ sign indicating number type, overcome existing filters solutions and inserted the big shortcoming of loss, improve sensitivity, made fine being applied in the high speed RZ sign indicating number extra long distance optical transmission system of this RZ sign indicating number NRZ conversion reception technique energy, improved the shake timing tolerance limit of system.
Description of drawings:
Fig. 1 is a RZ sign indicating number optical transmission system schematic diagram.
Fig. 2 a, 2b are respectively RZ sign indicating number type and NRZ sign indicating number type schematic diagram.
Fig. 3 is a kind of scheme schematic diagram that the RZ sign indicating number is converted to the NRZ sign indicating number in the prior art.
Fig. 4 a, 4b are respectively the circuit and the eye pattern schematic diagrames of the RZ sign indicating number another kind of scheme that is converted to the NRZ sign indicating number.
Fig. 5 is the present invention program's schematic diagram.
Fig. 6 a, 6b, 6c are respectively the embodiment of the invention at the waveform schematic diagram of 3 of a, b, c.
Embodiment:
Also the present invention is described in further detail in conjunction with the accompanying drawings below by specific embodiment.
General diagram of the present invention as shown in Figure 5.RZ sign indicating number NRZ conversion reception technique of the present invention is to utilize low-pass filtering that the non-linear enlarging function of time domain waveform distortion function and limiting amplifier is realized.As shown in Figure 5, by RZ light signal on Photoelectric Detection pipe (as the PIN pipe) 1 detection line, it is become current signal be input to trans-impedance amplifier 2 (abbreviation TIA, it is equivalent to a filter, in fact, and from wide significance, any one device with certain bandwidth all has the effect of filter), behind trans-impedance amplifier 2, signal becomes the blended voltage signals between RZ and NRZ, delivers in the limiting amplifier (being called for short LA) 3 again and is converted to standard N RZ signal.
The signal waveform that a, b among Fig. 5, c are 3 is respectively shown in Fig. 6 a, 6b, 6c.
Below in conjunction with Fig. 6 principle of the present invention is described.We know by RZ signal behind the low pass filter can for the NRZ signal, after it is by the device of bandwidth less than 1.5 times of bit rates, all can show the feature of certain non-return-to-zero in shape because the high fdrequency component loss becomes the NRZ signal.As the employing bandwidth of speaking of previously is that the Gaussian filter of 3/8 bit rate (be equal on the filter bandwidht numerical value supplied with digital signal bit rate 3/8) is changed the NRZ signal that can obtain to test usefulness to the RZ sign indicating number.But input RZ signal high frequency loss can be brought the insertion loss to system, influences receiver sensitivity, so the filter bandwidht consideration of must being traded off.
This compromise needs are taken all factors into consideration bandwidth, insert loss, group delay, are removed ability of making zero and existing device, show that through our experiment the bandwidth of selecting for use equals the device of 3/4 bit rate can obtain effect preferably.Also can select bandwidth under the prerequisite that satisfies limiting amplifier sensitivity is the device of 60%-120% bit rate.
Therefore present embodiment adopts TIA to have the electric bandwidth (than used 3/8 wide of prior art) of 3/4 bit rate, has obtained the signal near NRZ sign indicating number type under the less prerequisite of light signal energy loss, shown in Fig. 6 b.And then this signal is sent in the high sensitivity limiting amplifier 3, by choosing suitable threshold V1, V2, make it near the signal eye diagram crosspoint.Referring to Fig. 6 b, be to connect " 1 " the lowest point point above the crosspoint, the below as long as make V1, V2 at the lowest point point and between even put " 0 ", just can make output signal correctly be changed for connecting " 0 ".The principle that selected threshold that Here it is will satisfy also is the limiting amplifier sensitivity of satisfying mentioned above.
Shown in Fig. 6 b, company's one voltage of the fluctuating more than threshold value V1 all is limited and is enlarged into the Leve11 shown in Fig. 6 c, the following no-voltage of V2 also is amplified to the Leve10 shown in Fig. 6 c, Leve11 and Leve10 have same pressure reduction apart from the crosspoint, and the RZ sign indicating number just is converted into standard N RZ signal like this.The limiting amplifier output peak-to-peak value that the present invention selects for use can reach 500mV, can finely satisfy the requirement that system docking is received module, is convenient to the processing of back stages of digital chip.
In general, the present invention has utilized the prior art filters solutions to be simple and easy to not needing to realize the advantage of high-frequency clock, adopt and suitably increase the Gaussian filter bandwidht, increase the judgement of one-level high sensitivity limiting amplifier and amplify the standard NRZ sign indicating number type that is converted to, overcome scheme two and inserted the big shortcoming of loss, make fine being applied in the high speed RZ sign indicating number extra long distance optical transmission system of this RZ sign indicating number NRZ conversion reception technique energy, improved the shake timing tolerance limit of system.Compared with prior art, the present invention is easy to realize receiving sensitivity height, the waveform standard after the conversion.
The emulation of the present invention's process, simulation, and on probation in an experiment optical transmission system, confirm reliably feasible through practice.
Claims (10)
1, a kind of high-speed optical return-to-zero code non-return-to-zero conversion receiving system, comprise the photoelectric detection system (1) that input links to each other with nrz optical signal, it is characterized in that: also comprise the filter (2), the limiting amplifier (3) that link to each other successively, the output of the input termination photoelectric detection system (1) of described filter (2), the output of limiting amplifier (3) is the output of resulting nonreturn to zero code.
2, high-speed optical return-to-zero code non-return-to-zero conversion receiving system as claimed in claim 1, it is characterized in that: described photoelectric detection system (1) is a PIN Photoelectric Detection pipe, and filter (2) is a trans-impedance amplifier.
3, high-speed optical return-to-zero code non-return-to-zero conversion receiving system as claimed in claim 1 or 2, it is characterized in that: described filter (2) bandwidth is numerically equal to the 60%-120% of bit rate numerical value.
4, high-speed optical return-to-zero code non-return-to-zero conversion receiving system as claimed in claim 1 or 2, it is characterized in that: described filter (2) bandwidth is numerically equal to 3/4 of bit rate numerical value.
5, high-speed optical return-to-zero code non-return-to-zero conversion receiving system as claimed in claim 1 or 2, it is characterized in that: two threshold values (V1, V2) of limiting amplifier (3) are respectively in both sides, signal eye diagram crosspoint, company " 1 " signal voltage of the fluctuating more than first threshold (V1) all is limited and is amplified to first level (Leve11), the following no-voltage of second threshold value (V2) also is amplified to second level (Leve10), and first and second level (Leve11, Leve10) has same pressure reduction apart from the crosspoint.
6, a kind of high-speed optical return-to-zero code non-return-to-zero conversion method of reseptance is characterized in that comprising the steps:
By the nrz optical signal on photoelectric detection system (1) detection line, it is become the signal of telecommunication be input to filter (2);
Filter (2) is the mixing signal of telecommunication between NRZ and nonreturn to zero code with conversion of signals, sends into limiting amplifier (3);
Limiting amplifier (3) carries out amplitude limit to signal and amplifies, and becomes the nonreturn to zero code signal.
7, high-speed optical return-to-zero code non-return-to-zero conversion method of reseptance as claimed in claim 6, it is characterized in that: the photoelectric detection system (1) that uses in the described Photoelectric Detection process is a PIN Photoelectric Detection pipe, and the filter (2) that described filtering transfer process is to use is a trans-impedance amplifier.
8, as claim 6 or 7 described high-speed optical return-to-zero code non-return-to-zero conversion method of reseptances, it is characterized in that: described filter (2) bandwidth is numerically equal to the 60%-120% of bit rate numerical value.
9, as claim 6 or 7 described high-speed optical return-to-zero code non-return-to-zero conversion method of reseptances, it is characterized in that: described filter (2) bandwidth is numerically equal to 3/4 of bit rate numerical value.
10, as claim 6 or 7 described high-speed optical return-to-zero code non-return-to-zero conversion method of reseptances, it is characterized in that: two threshold values (V1, V2) of limiting amplifier (3) are respectively in both sides, signal eye diagram crosspoint, company " 1 " signal voltage of the fluctuating more than first threshold (V1) all is limited and is amplified to first level (Leve11), the following no-voltage of second threshold value (V2) also is amplified to second level (Leve10), and first and second level (Leve11, Leve10) has same pressure reduction apart from the crosspoint.
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| CNB021246394A CN1214557C (en) | 2002-06-19 | 2002-06-19 | High-speed optical return-to-zero code non-return-to-zero convertion receiver and receiving method |
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| CNB021246394A CN1214557C (en) | 2002-06-19 | 2002-06-19 | High-speed optical return-to-zero code non-return-to-zero convertion receiver and receiving method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006058459A1 (en) * | 2004-12-01 | 2006-06-08 | Zte Corporation | Adaptive optical receiving device and the method thereof |
| CN103109477A (en) * | 2010-09-24 | 2013-05-15 | 英特尔公司 | Jitter reduction of electrical signals from limiting optical modules |
| CN104992953A (en) * | 2015-07-13 | 2015-10-21 | 成都嘉石科技有限公司 | GaAs-based optoelectronic integrated device and preparation method thereof |
| CN110351000A (en) * | 2019-08-15 | 2019-10-18 | 中国科学院半导体研究所 | Full light serioparallel exchange system based on wavelength-division multiplex technique |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442136C (en) * | 2006-12-28 | 2008-12-10 | 华中科技大学 | Non-return-to-zero code to return-to-zero code all-optical code type conversion device |
-
2002
- 2002-06-19 CN CNB021246394A patent/CN1214557C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006058459A1 (en) * | 2004-12-01 | 2006-06-08 | Zte Corporation | Adaptive optical receiving device and the method thereof |
| CN101027859B (en) * | 2004-12-01 | 2011-02-02 | 中兴通讯股份有限公司 | Adaptive light receiving device and its adaptive light receiving method |
| CN103109477A (en) * | 2010-09-24 | 2013-05-15 | 英特尔公司 | Jitter reduction of electrical signals from limiting optical modules |
| CN103109477B (en) * | 2010-09-24 | 2016-08-24 | 英特尔公司 | Shake from the signal of telecommunication of restricted optical module reduces |
| CN104992953A (en) * | 2015-07-13 | 2015-10-21 | 成都嘉石科技有限公司 | GaAs-based optoelectronic integrated device and preparation method thereof |
| CN104992953B (en) * | 2015-07-13 | 2018-02-09 | 成都海威华芯科技有限公司 | Integrated optoelectronic device based on GaAs and preparation method thereof |
| CN110351000A (en) * | 2019-08-15 | 2019-10-18 | 中国科学院半导体研究所 | Full light serioparallel exchange system based on wavelength-division multiplex technique |
| CN110351000B (en) * | 2019-08-15 | 2020-09-15 | 中国科学院半导体研究所 | All-optical serial-parallel conversion system based on wavelength division multiplexing technology |
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| CN1214557C (en) | 2005-08-10 |
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