WO2005101702A1 - 光受信装置 - Google Patents
光受信装置 Download PDFInfo
- Publication number
- WO2005101702A1 WO2005101702A1 PCT/JP2004/005374 JP2004005374W WO2005101702A1 WO 2005101702 A1 WO2005101702 A1 WO 2005101702A1 JP 2004005374 W JP2004005374 W JP 2004005374W WO 2005101702 A1 WO2005101702 A1 WO 2005101702A1
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- WO
- WIPO (PCT)
- Prior art keywords
- optical
- circuit
- arithmetic circuit
- error rate
- paths
- Prior art date
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Classifications
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
Definitions
- the present invention relates to an optical receiver, and more particularly, to an optical receiver technology applied to an ultra-high speed / ultra-long distance optical transmission system or the like.
- Patent Document 1 Conventionally, as a technique for improving the reception sensitivity of this kind, there is a disclosure example disclosed in Patent Document 1 below.
- Non-Patent Document 1 k sets (n Xk) of classifiers having different thresholds from each other are defined as a set of a plurality of n classifiers having the same threshold value.
- Non-Patent Document 1 shown below for example, as an application example of the receiving technique shown in Patent Document 1, one optical signal is wavelength-separated in a receiving stage, and a discriminator is provided for each optical signal. The sensitivity of the receiver is improved by adopting data that is more reliable from the classification results of each classifier.
- Non-Patent Document 1 uses a technique of separating the spectrum of an optical signal by an optical filter, so that a separation penalty in the optical filter is likely to occur, and the There was a problem that improvement in sensitivity could not be expected.
- the present invention prevents generation of a separation penalty by the light separation unit. It is an object of the present invention to provide an optical receiver that stops the operation and eliminates the dependence on the modulation method, thereby ensuring ease of mounting. Disclosure of the invention
- an optical separating unit that separates an optical input signal into a plurality of paths; an optical-electrical converting unit that converts the separated optical input signal into an electric signal; A discriminator that outputs a discrimination result obtained by discriminating the electric signal output from the discriminator based on a predetermined threshold value, and an arithmetic circuit that performs a predetermined operation based on the discrimination result output from the discriminator , are provided.
- the optical separation unit separates the optical input signal into a plurality of paths
- the photoelectric conversion unit converts the separated optical input signal into an electric signal
- the discriminator includes the photoelectric conversion unit
- the arithmetic circuit performs a predetermined operation based on the identification result output from the classifier, by outputting an identification result obtained by identifying the electric signal output from the electronic device based on a predetermined threshold value.
- FIG. 1 is a block diagram showing a configuration of an optical receiving device according to a first embodiment of the present invention.
- FIG. 2A is a diagram for explaining a flow of identification results of the optical receiving device shown in FIG.
- FIG. 2B is a diagram showing a truth table of the OR circuit
- FIG. 2C is a diagram showing a truth table of the AND circuit
- FIG. 3 is a threshold diagram.
- FIG. 4 is a diagram showing a bit error rate characteristic with respect to a value change
- FIG. 4 is a block diagram showing a configuration of an optical receiving apparatus according to a second embodiment of the present invention
- FIG. FIG. 6 is a block diagram illustrating a configuration of an optical receiving apparatus according to Embodiment 3 of the present invention.
- FIG. 1 is a block diagram showing a configuration of an optical receiving device according to a first embodiment of the present invention.
- FIG. 2A is a diagram for explaining a flow of identification results of the optical receiving device shown in FIG.
- FIG. 2B is
- FIG. 6 is a block diagram illustrating a configuration of an optical receiving apparatus according to Embodiment 4 of the present invention.
- FIG. 19 is a block diagram showing a configuration of an optical receiving device according to a fifth embodiment of the present invention. '' Best mode for carrying out the invention 2004/005374
- Embodiment 1 Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings. The present invention is not limited by the embodiment. Embodiment 1.
- FIG. 1 is a block diagram showing a configuration of the optical receiver according to the first embodiment of the present invention.
- the optical receiver shown in FIG. 1 includes an optical amplifier 10 for amplifying an optical input signal, an optical separation unit 11 for separating the optical input signal into two paths, path 1 and path 2, and an optical input signal after separation.
- Converters 12a and 12b for converting the analog electric signals into electric signals, and identification based on predetermined thresholds V thl and V th2 of the analog electric signals output from the photoelectric converters 12a and 12b . It comprises: discriminators 13a and 13b for outputting a result (digital data signal); and an operation circuit 14 for performing a logical operation based on the digital signal of each path.
- the arithmetic circuit 14 can be composed of, for example, a logical sum (OR) circuit or a logical product (AND) circuit.
- an optical signal transmitted from an optical transmitter or the like is input to the optical receiver.
- the received optical input signal is amplified by an optical amplifier 10 and then separated by an optical separation unit 11 into two paths, a path 1 and a path 2.
- the optical input signals separated into the two paths are converted into electric signals by the photoelectric conversion units 12a and 12b and output to the discriminators 13a and 13b.
- the discriminators 13a and 13b output a discrimination result (digital data signal) obtained by discriminating the analog electric signal based on a predetermined threshold value Vth or Vth2 to the arithmetic circuit 14.
- the arithmetic circuit 14 outputs a processing result obtained by performing a predetermined processing.
- the probability that the result is erroneous is determined by assuming that the Gaussian noise contained in the optical signal of each path is uncorrelated with each other so that the independence between the classifiers 13a and 13b is maintained. .
- the arithmetic circuit 14 is configured by a logical sum (OR) circuit.
- FIG. 2A is a diagram for explaining the flow of the identification result of the optical receiver shown in FIG. 1, and FIG. 2B is a diagram showing a truth table of the OR circuit.
- (1/0) shown at the output end of the discriminator 13a is a probability that the discrimination result is mistaken for a logic "1" when a logic "0" is input to the discriminator 13a.
- (0/1) is the probability that if the logic "1" is input to the discriminator 13a, the discrimination result will be mistaken for a logic "0".
- ⁇ ⁇ (1/0) mistakes the discrimination result as a logical "1" when a logic “0” is input to the discriminator 13b.
- P 2 (0/1) is a probability that the identification result is mistaken for a logic “0” when a logic “1” is input to the discriminator 13 b.
- P. ut (1/0) is the classification result of the processing performed by the arithmetic circuit 14 based on the classification results of the classifiers 13a and 13b.
- the probability is that the identification result is mistaken for logic "1" when logic "0" is input to the input end of the optical receiver.
- P. ut (0/1) is the probability that the arithmetic circuit 14 will mistake the identification result as logic "1” when logic "1” is input to the input end of the optical receiver.
- Equation (1) can be simplified to the following equation.
- FIG. 2C shows a truth table of the AND circuit.
- the conditions such as the mark ratio, threshold, and value level are the same as those of the OR circuit.
- FIG. 3 is a diagram showing a bit error rate characteristic with respect to a change in threshold value. More specifically, the signal amplitude of the electric signal input to the discriminators 13a and 13b is set to "1", and the standard deviation of the logic “0" and the logic “1" (corresponding to a noise component) is added.
- the bit error rate takes a minimum value when the threshold value is a standard value (0.5).
- arithmetic circuit 1 When an OR circuit is used for 4, the minimum value is obtained when the threshold value is higher than the standard value (around 0.6 in the figure), and the minimum value is determined by a single classifier. is smaller in 1 0 one 2 orders in comparison with the case of using, it is clear that the sensitivity of the identification is improved.
- This sensitivity improvement effect is achieved by setting the threshold of discrimination higher than the standard value, that is, by reducing P (1/0), which is the probability that a logical "0" will be a logical "1" error. Is done.
- the threshold value takes a minimum value at a value higher than the standard value (near 0.4 in the figure), and the value of the minimum value is a single value.
- the classifiers are summer small to 1 0 one 2 orders compared with the case of using the sensitivity of the identification is improved.
- the characteristic "I" raw shown in Fig. 3 is an example of the calculation result. If the noise distribution is different from the calculation result in Fig. 3, or the noise distribution is asymmetric. for ( ⁇ . ⁇ ⁇ ⁇ ) even in such, more choosing V th l and V th2 to a predetermined value, the reception as compared with the case of performing the normal light reception using the single discriminator Sensitivity can be improved.
- the optical input signal is separated into a plurality of paths, the separated optical input signal is converted into an electrical signal, and the electrical signal output from the photoelectric conversion unit is converted into an electrical signal.
- a predetermined operation of a logic circuit or a logical product circuit is performed based on a predetermined threshold, a value, and a recognition result based on the identified result, thereby improving the reception sensitivity of the optical receiver. be able to.
- FIG. 4 is a block diagram showing a configuration of the optical receiver according to the second embodiment of the present invention.
- the optical receiving device shown in the figure has the configuration of the optical receiving device shown in FIG. 1 and additionally compensates for a decrease in optical level between the optical separating unit 11 and the photoelectric converting units 12a and 12b.
- -Optical amplifiers 40a and 40b are provided.
- the other configuration is the same as or equivalent to that of the first embodiment, and these parts are denoted by the same reference characters T.
- an optical signal transmitted from an optical transmitter or the like is input to the optical receiver.
- the received optical input signal is amplified by an optical amplifier 10 and then separated by an optical separation unit 11 into two paths, a path 1 and a path 2.
- the optical signals split into two paths are amplified by the optical amplifiers 40a and 40b, respectively.
- the optical SNR Signal 1 to Noise Ratio
- the optical amplifiers 40a and 40b for compensating for the decrease in the level of the optical signal separated into the two paths are present between the optical separation unit 11 and the photoelectric conversion units 12a and 12b. Even in this case, the receiving sensitivity of the optical receiving device can be improved by the photoelectric conversion units 12a and 12b, the discriminators 13a and 13b, and the arithmetic circuit 14, as in the first embodiment.
- optical amplifiers 10, 40a, and 40b any optical amplifier such as a rare earth-doped fiber amplifier or a semiconductor amplifier (SOA: emic on ductor optical amplifier) may be used. .
- SOA semiconductor amplifier
- the optical input signal is separated into two paths by the optical separation unit, but is not limited to two, and may be separated into three or more arbitrary paths. Are the same as in the first embodiment.
- FIG. 5 is a block diagram showing a configuration of an optical receiving device according to a third embodiment of the present invention.
- the optical receiving device shown in the figure is different from the configuration of the optical receiving device shown in FIG. 1 in that an arithmetic circuit 50 having a function different from that of the arithmetic circuit 14 is provided, and a bit error rate monitoring unit for monitoring the output of the arithmetic circuit 50.
- a discrimination threshold for the discriminators 13a and 13b, a discrimination threshold for controlling a value, and a value control circuit 52 are provided.
- the other configuration is the same as or similar to that of the first embodiment, and these portions are denoted by the same reference numerals.
- an optical signal transmitted from an optical transmitter (not shown) or the like is input to the optical receiver.
- the received optical input signal is amplified by the optical amplifier 10 and then separated by the optical separation unit 11 into two paths, path 1 and path 2.
- the optical input signal separated into the two paths is converted into an electric signal by the photoelectric conversion units 12a and 12b and output to the discriminators 13a and 13b.
- the discriminators 13 a and 13 b output a discrimination result (digital data signal) obtained by discriminating the analog electric signal based on a predetermined threshold value V th or V th2 to the arithmetic circuit 50.
- the arithmetic circuit 50 outputs an arithmetic result obtained by performing a predetermined arithmetic operation based on the identification results of the identifiers 13a and 13b.
- the bit error rate monitor 51 monitors the bit error rate based on the output of the arithmetic circuit 50, and outputs the monitoring result to the bit error rate monitor 51.
- the discrimination threshold control circuit 5.2 controls the discrimination thresholds of the discriminators 13a and 13b so that the bit error rate is reduced.
- the threshold value given to the discriminators 13a and 13b depends on whether the arithmetic circuit 14 is a logical AND circuit as an OR circuit as described above. Had been decided.
- the threshold value to be given to the identifiers 13a and 13b is determined based on the bit error rate. In other words, the thresholds to be applied to the discriminators 13a and 13 are determined first, and the arithmetic circuit 50 performs the optimal arithmetic processing based on the determined thresholds.
- the thresholds given to the discriminators 13a and 13b are standard. If the value is set smaller than the value, the function of the arithmetic circuit 50 may be switched to the function of the AND circuit. On the other hand, when the threshold values assigned to the discriminators 13a and 13b are set to be larger than the standard values, the function of the arithmetic circuit 50 may be switched to the function of the OR circuit.
- a method may be used in which the identification threshold is swept by a number of points to determine a point at which the error rate is minimized.
- the identification threshold may be swept on a trial basis.
- the thresholds given to the classifiers 13a and 13b do not necessarily have to be equal.
- the arithmetic circuit based on the error rate information of the output result of the monitored arithmetic circuit and the variable threshold value of the discriminator. Function is switched to, for example, a logical product circuit or a logical product circuit, so that a predetermined reception sensitivity is maintained even when the input condition of the optical signal is changed. can do.
- the optical input signal is separated into two paths by the optical separation unit.
- the present invention is not limited to the two paths and may be separated into three or more arbitrary paths. Is the same as in the other embodiments.
- FIG. 6 is a block diagram showing a configuration of an optical receiver according to Embodiment 4 of the present invention.
- the optical receiving device shown in FIG. 2 includes an optical polarization separating unit 61 instead of the optical separating unit 11 in the configuration of the optical receiving device shown in FIG.
- An optical polarization control unit 60 for controlling the polarization plane of the optical signal is provided between the optical amplifier and the amplifier 10, and each path between the optical polarization separation unit 61 and the photoelectric conversion units 12a and 12b is provided.
- Power monitoring units 63a and 63b for monitoring the optical power of the optical signal through the provided optical power plugs 62a and 62b are provided.
- the other configuration is the same as or equivalent to that of the first embodiment, and these portions are denoted by the same reference numerals.
- an optical signal transmitted from an optical transmitter or the like is input to the optical receiver.
- the received optical input signal is amplified by the optical amplifier 10, it is subjected to polarization control by the optical polarization control unit 69, and is divided into two paths, path 1 and path 2, by the optical polarization separation unit 61. Separated.
- optical polarization control unit 69 the optical polarization separation unit 61, and the optical power plugs 6 2a, 6
- the receiving sensitivity is improved by the photoelectric conversion units 12a, 12b, the discriminators 13a, 13b, and the arithmetic circuit 14.
- the effect is the same as in the first embodiment.
- the optical polarization controller is controlled so that the output values of the optical signal powers on the plurality of paths monitored by the optical monitor become substantially equal. Therefore, optical signals on a plurality of paths can be received stably.
- the optical input signal is separated into two paths by the optical separation unit.
- the present invention is not limited to two paths, and may be separated into three or more arbitrary paths. 'Is the same as in the other embodiments.
- FIG. 7 is a block diagram showing a configuration of an optical receiving device according to a fifth embodiment of the present invention.
- the optical receiver shown in the figure has the same configuration as the optical receiver shown in FIG. 5, except that soft discriminators 70a and 70b are provided in place of the discriminators 13a and 13b.
- a plurality of arithmetic circuits 7 1-1, 7 1-2, ⁇ ⁇ ⁇ , 7 1-n are provided corresponding to the threshold levels of A monitor 72 is provided.
- a new path selector 73 is provided for selecting an optimum identification result from the output results of the plurality of arithmetic circuits 71-1, 71-2,..., 71-n.
- the other configuration is the same as or similar to that of the third embodiment, and these portions are denoted by the same reference numerals.
- the classifier 1 The classifier 1
- an optical signal transmitted from an optical transmitter (not shown) or the like is input to the optical receiver.
- the received optical input signal is amplified by the optical amplifier 10 and then separated by the optical separation unit 11 into two paths, path 1 and path 2.
- the optical input signals separated into two paths are converted into electric signals by opto-electric conversion units 12a and 12b, and output to soft decision discriminators 70a and 70b.
- Soft decision discriminator 70 a, 7 O b is an analog electrical signal a predetermined threshold V th have V thl, ⁇ ⁇ ⁇ , identification result of the identification on the basis of the V th2 (digital data signal) to the arithmetic circuit 71- Output to 1, 7 1–2, ⁇ , 71–n.
- Each of the arithmetic circuits 71-1, 71-2,..., 71-n outputs an arithmetic result obtained by performing a predetermined arithmetic operation based on the identification result of the soft decision identifier 70a, 70b.
- the bit error rate monitoring unit 72 monitors the bit error rate based on the outputs of the arithmetic circuits 71-1, 71-2,..., 71-n, and outputs the monitoring result to the path selection unit 73. .
- the path selection unit 73 selects and outputs the operation circuit output with the smaller bit error rate.
- a soft decision classifier is used as a classifier, and an optimal classification result is selected from the outputs of a plurality of arithmetic circuits.
- the bit error rate can be further reduced while improving the reception sensitivity. .
- the identification is performed using the soft decision identification means, and the output result with the low error rate is selected based on the bit error rate monitor information.
- the bit error rate can be further reduced while improving the receiving sensitivity.
- the optical input signal is separated into two paths by the optical separation unit.
- the present invention is not limited to the two paths and may be separated into three or more arbitrary paths. Is the same as in the other embodiments. Industrial applicability
- the optical receiving device according to the present invention is useful as an optical receiving device applicable to an ultra-high speed / ultra-long distance optical transmission system, particularly when it is desired to improve the receiving sensitivity of these systems. Suitable for.
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/589,349 US7903982B2 (en) | 2004-04-15 | 2004-04-15 | Optical receiver |
JP2006512226A JP4842122B2 (ja) | 2004-04-15 | 2004-04-15 | 光受信装置 |
PCT/JP2004/005374 WO2005101702A1 (ja) | 2004-04-15 | 2004-04-15 | 光受信装置 |
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PCT/JP2004/005374 WO2005101702A1 (ja) | 2004-04-15 | 2004-04-15 | 光受信装置 |
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WO2005101702A1 true WO2005101702A1 (ja) | 2005-10-27 |
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PCT/JP2004/005374 WO2005101702A1 (ja) | 2004-04-15 | 2004-04-15 | 光受信装置 |
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US (1) | US7903982B2 (ja) |
JP (1) | JP4842122B2 (ja) |
WO (1) | WO2005101702A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US7606498B1 (en) * | 2005-10-21 | 2009-10-20 | Nortel Networks Limited | Carrier recovery in a coherent optical receiver |
JP2009218837A (ja) * | 2008-03-10 | 2009-09-24 | Fujitsu Ltd | 光受信装置および光受信方法 |
JP2014230043A (ja) * | 2013-05-21 | 2014-12-08 | 富士通オプティカルコンポーネンツ株式会社 | 光受信器および識別レベル制御方法 |
JP6608747B2 (ja) * | 2016-03-25 | 2019-11-20 | 富士通株式会社 | 波長多重光受信装置及びその駆動方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0430634A (ja) * | 1990-05-24 | 1992-02-03 | Nippon Telegr & Teleph Corp <Ntt> | 信号通信方式 |
JPH09294141A (ja) * | 1996-04-26 | 1997-11-11 | Japan Aviation Electron Ind Ltd | デジタル光信号受信回路 |
JP2003163637A (ja) * | 2001-09-13 | 2003-06-06 | Mitsubishi Electric Corp | 光受信装置 |
JP2003234699A (ja) * | 2001-12-05 | 2003-08-22 | Nippon Telegr & Teleph Corp <Ntt> | ディジタル伝送システム |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0734080B2 (ja) * | 1988-10-20 | 1995-04-12 | 富士通株式会社 | コヒーレント光通信用ヘテロダイン検波受信装置 |
JP2776124B2 (ja) * | 1992-03-23 | 1998-07-16 | 日本電気株式会社 | 直接検波光受信装置 |
JP4019555B2 (ja) | 1999-05-25 | 2007-12-12 | Kddi株式会社 | 光受信装置及び方法 |
JP3498839B2 (ja) * | 1999-12-21 | 2004-02-23 | 日本電気株式会社 | 光通信用受信器 |
DE10147871B4 (de) * | 2001-09-28 | 2004-01-15 | Siemens Ag | Verfahren zur Übertragung von mindestens einem ersten und zweiten Datensignal im Polarisationsmultiplex in einem optischen Übertragungssystem |
US8639127B2 (en) * | 2002-03-06 | 2014-01-28 | Alcatel Lucent | Method and apparatus for improved jitter tolerance |
US7209671B1 (en) * | 2002-04-22 | 2007-04-24 | Tyco Telecommunications (Us) Inc. | Multiple detector decision receiver |
US7643761B2 (en) * | 2004-02-19 | 2010-01-05 | Alcatel-Lucent Usa Inc. | Method and apparatus for processing optical duobinary signals |
-
2004
- 2004-04-15 JP JP2006512226A patent/JP4842122B2/ja not_active Expired - Fee Related
- 2004-04-15 WO PCT/JP2004/005374 patent/WO2005101702A1/ja active Application Filing
- 2004-04-15 US US10/589,349 patent/US7903982B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0430634A (ja) * | 1990-05-24 | 1992-02-03 | Nippon Telegr & Teleph Corp <Ntt> | 信号通信方式 |
JPH09294141A (ja) * | 1996-04-26 | 1997-11-11 | Japan Aviation Electron Ind Ltd | デジタル光信号受信回路 |
JP2003163637A (ja) * | 2001-09-13 | 2003-06-06 | Mitsubishi Electric Corp | 光受信装置 |
JP2003234699A (ja) * | 2001-12-05 | 2003-08-22 | Nippon Telegr & Teleph Corp <Ntt> | ディジタル伝送システム |
Also Published As
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JPWO2005101702A1 (ja) | 2008-03-06 |
US7903982B2 (en) | 2011-03-08 |
JP4842122B2 (ja) | 2011-12-21 |
US20070177885A1 (en) | 2007-08-02 |
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