WO2004068705A1 - 前置増幅回路及びクロック切替え回路及びそれを用いた光受信器 - Google Patents
前置増幅回路及びクロック切替え回路及びそれを用いた光受信器 Download PDFInfo
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- WO2004068705A1 WO2004068705A1 PCT/JP2004/000647 JP2004000647W WO2004068705A1 WO 2004068705 A1 WO2004068705 A1 WO 2004068705A1 JP 2004000647 W JP2004000647 W JP 2004000647W WO 2004068705 A1 WO2004068705 A1 WO 2004068705A1
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- signal
- preamplifier
- circuit
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- exclusive
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- 230000003287 optical effect Effects 0.000 title claims abstract description 54
- 230000000630 rising effect Effects 0.000 claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 230000005540 biological transmission Effects 0.000 claims description 38
- 238000001514 detection method Methods 0.000 claims description 18
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims 2
- 101150062708 Uso1 gene Proteins 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 18
- 238000011084 recovery Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3084—Automatic control in amplifiers having semiconductor devices in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/366—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator
- H04L27/367—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion
- H04L27/368—Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator using predistortion adaptive predistortion
Definitions
- the present invention relates to a preamplifier circuit, a switchover circuit, and an optical receiver using the same, and more particularly, to a preamplifier for a photoelectrically converted signal provided in the optical receiver, and to reduce the signal transmission speed.
- the present invention relates to a preamplifier circuit and a clock switch circuit that switch clocks in response to the change, and an optical receiver using the same.
- preamplifier circuit As a preamplifier circuit provided in an optical receiver and preamplifying a signal obtained by photoelectric conversion, for example, Japanese Patent Application Laid-Open No. HEI 3 _ 195 10 07, or Japanese Patent Application Laid-Open No. H. There are those described in.
- FIG. 1 shows a block diagram of an example of a conventional preamplifier circuit.
- an optical detector 1 photoelectrically converts an optical input signal.
- the output signal of the optical detector 1 is amplified by the preamplifier 2.
- a variable resistive element 3 whose bias value changes in resistance.
- the output signal of the preamplifier 2 is supplied to the next-stage circuit and also to the comparison circuits 4 and 5.
- the comparison circuit 4 compares the output signal with the first reference voltage and supplies a comparison result to the control voltage generation circuit 6, and the comparison circuit 5 compares the output signal with a signal lower than the first reference and the second reference and compares the output signal with the second reference voltage. Is supplied to the ® generation circuit 6.
- the control voltage generation circuit 6 obtains an exclusive OR (that is, a rise and fall detection signal) of the above two comparison results, obtains an 'average voltage of the exclusive OR signal, Performs differential amplification with voltage and outputs control voltage. This control voltage is applied to the variable resistance element 3 as a bias, and variably controls the resistance value of the variable resistance element 3.
- variable resistance element 3 controls the amount of feedback that feeds back the output of the preamplifier 2 to the input side, thereby varying the gain and frequency bandwidth of the preamplifier 2 and being optimal for the frequency of the optical input signal. It is in the form.
- the conventional preamplifier circuit requires that the number of rising and falling edges of the input signal within a certain period of time does not fall outside a predetermined range. For this reason, if the number of rises and falls of the optical input signal within a certain period of time becomes smaller than a predetermined range, the control voltage of the variable resistance element 3 cannot be generated correctly, and the band control does not operate properly. Cause problems.
- the signal reliably equalize light ⁇ (R e S haping), retiming (R etiming), it is essential that 3 R function to the reproducing (Re generati ng) operates adaptively.
- FIG. 2 shows a block diagram of an example of a conventional optical receiver.
- the optical detector 1 photoelectrically converts an optical input signal.
- the output signal of the optical detector 1 is amplified by the preamplifier 2.
- a variable resistance element 3 whose resistance value changes with a bias.
- the output signal of the preamplifier 2 is supplied to a clock generator 8 and an identification circuit 9 via an AGC (automatic gain control) amplifier 7.
- the clock generator 8 generates a clock synchronized with a clock component included in the output signal of the AGC amplifier 7 using a PLL or a SAW filter, and supplies the clock to the identification circuit 9.
- the identification circuit 9 reproduces data by sampling the output signal of the AGC amplifier 7 with the clock supplied from the clock generator 8, and outputs this data together with the clock.
- the transmission speed is 622 Mb / s, 2.48 Gb / S , 1 OGb / A dedicated optical receiver is used for each s.
- the preamplifier 2 and the AGC amplifier 7 that perform equalization amplification support the transmission speed of 2.48 Gb / s, the transmission speed 1 OGb / faster than the equalization band (2.48 Gb / s)
- the received signal (10 Gb / S ) is band-limited at the equalizing bandwidth, the waveform is distorted, and the reception characteristics are degraded.
- the high-frequency noise component is increased by the preamplifier 2, and the reception characteristics are poor.
- the bandwidth can be automatically adjusted without being affected by the input signal pattern, and the clock can be automatically switched according to the transmission speed of the input signal, thereby reducing the cost. It is a general object to provide a preamplifier circuit and a clock switching circuit and an optical receiver using the same.
- a preamplifier circuit comprises: a preamplifier for setting a bandwidth for performing amplification by varying a feedback resistance according to a control signal; and an output signal of the preamplifier.
- Control signal generation means for detecting the band of the control signal to generate the control signal
- correction signal generation means for generating a correction signal of the control signal, wherein the control signal is corrected by the correction signal and the feedback resistance is adjusted. It is configured to perform variable adjustment of the value.
- FIG. 1 is a block diagram of an example of a conventional preamplifier circuit.
- FIG. 2 is a block diagram of an example of a conventional optical receiver.
- FIG. 3 is a block diagram of one embodiment of the preamplifier circuit of the present invention and an optical receiver using the same.
- FIG. 4 is a detailed schematic diagram of an embodiment of the preamplifier circuit and the optical receiver using the same according to the present invention.
- FIG. 5 is a diagram illustrating characteristics of the preamplifier according to the resistance value of the variable resistance element.
- FIG. 6 is a signal waveform diagram for explaining the present invention.
- FIG. 1 is a block diagram of an embodiment of a front-end width circuit and a mouthpiece switching circuit and an optical receiver using the same according to the present invention.
- FIG. 8 is a detailed block diagram of an embodiment of the preamplifier circuit and the circuit switching circuit of the present invention and an optical receiver using the same.
- FIG. 9 is a diagram for explaining the relationship between the transmission speed of the optical input signal and the level of the control voltage.
- FIG. 10 is a waveform diagram of an exclusive OR signal at a transmission speed different from the reference clock.
- FIG. 11 is a circuit configuration diagram of one embodiment of the transmission rate detecting section and the frequency dividing section.
- FIG. 3 is a block diagram of one embodiment of the preamplifier circuit of the present invention and an optical receiver using the same
- FIG. 4 is a detailed block diagram thereof.
- the photodetector 10 is constituted by, for example, a photodiode and photoelectrically converts an optical input signal.
- the output signal of the optical detector 10 is amplified by the preamplifier 12.
- a variable resistance element 13 whose resistance changes with a bias voltage is provided in parallel with the preamplifier 12.
- the signal amplified by the preamplifier 12 is gain-controlled by the AGC amplifier 14 so that the output level is constant, and supplied to the clock and data recovery circuit 16 and comparators 20 and 22 Is done.
- the preamplifier 12 that performs feedback with the variable resistor 13 has a narrow frequency bandwidth and a large gain when the bias voltage is high, the resistance of the variable resistor 13 is large, and the amount of feedback is small.
- 5 has the characteristic shown by the dashed line, and has the characteristic shown by the two-dot dashed line when the resistance is small and the feedback amount is large and the gain is small.
- the resistance value of 3 is medium and the amount of feedback is medium, it has the characteristics shown by the solid line with a medium frequency bandwidth and medium gain.
- the preamplifier 12 of the optical detector 10 is optimal when the frequency fi of the optical input signal is fi 0.8 fc with respect to the cut-off frequency fc in the above characteristics, and fi 0.8 fc It is required to variably control the resistance value of the variable resistance element 13 so that
- the clock and data recovery circuit 16 is composed of a clock generator 17 and a discriminator 18 as shown in Fig. 4.
- the discriminator 18 generates the clock of the output signal of the AGC amplifier 14.
- the data is sampled and identified using the clock supplied from the device 17, and data obtained as a result of the identification is output from the terminal 19.
- Comparator 20 compares the output signal of AGC amplifier 14 with a first reference voltage
- comparator 22 compares the output signal of AGC amplifier 14 with a second reference voltage lower than the first reference voltage.
- the output signals of the comparators 20 and 22 are subjected to an exclusive OR operation by an exclusive OR circuit 24.
- the exclusive OR signal obtained here that is, the rising and falling detection signals are obtained by the average value detection circuit 26 and The signal is supplied to the correction signal generation circuit 28.
- the average value detection circuit 26 detects the average value ⁇ ] ⁇ of the exclusive OR signal and supplies it to the inverting input terminal of the differential amplifier 32.
- the correction signal generation circuit 28 includes a D-type flip-flop 29 and an integrator 30.
- the D-type flip-flop 29 samples the exclusive OR signal by using the data identification clock supplied from the clock generator 17 to obtain the exclusive OR signal.
- the pulse width is supplied to the integrator 30 at least as long as the clock cycle.
- the integrator 30 integrates the exclusive OR signal having a fixed pulse width and supplies the integrated voltage to the non-inverting input terminal of the differential amplifier 32.
- the differential amplifier 32 performs a differential amplification of the integrated voltage and the average voltage to generate a control voltage.
- the control B is applied to the variable resistance element 13 as a bias, and the resistance value of the variable resistance element 13 is variably controlled.
- the variable resistance element 13 feeds back the output of the preamplifier 1 2 to the input side, and variably controls the resistance value of the variable resistance element 13 to vary the gain and frequency bandwidth of the preamplifier 12, The form is optimal for the frequency of the optical input signal.
- the pass band of the preamplifier 12 is narrow.
- the output signal waveform of the AGC amplifier 14 becomes as shown in FIG. This waveform shows a “1” continuous pattern with a small number of rises and falls.
- the first and second reference voltages of the comparators 20 and 22 are indicated by a and b, respectively.
- the waveform of the exclusive OR signal output from the exclusive OR circuit 24 has a narrow pulse width as shown in FIG. 6 (B).
- the pulse width of the exclusive OR signal is at least the clock cycle shown in FIG. 6C, so that the exclusive logic output from the D-type flip-flop 29
- the waveform of the sum signal is as shown in FIG. 6D, and the integrated voltage output by the integrator 30 is relatively higher than the average voltage output by the average detection circuit 26.
- Figures 6 (E) and 6 (F) show the average voltage and the integral voltage, respectively, by broken lines. The solid line is the voltage of the state where the pulse of the exclusive OR signal is not present.
- the control voltage that is, the bias of the variable resistance element 13 is increased, and the pass band of the preamplifier 12 can be narrowed.
- the pass band of the preamplifier 12 becomes narrower, the pulse width of the exclusive OR signal output from the exclusive OR circuit 24 becomes wider than the waveform shown in FIG.
- the control voltage stabilizes when it reaches the level shown in (D).
- FIG. 7 is a block diagram of an embodiment of a preamplifier circuit and a switching circuit of the present invention and an optical receiver using the same
- FIG. 8 is a detailed block diagram thereof.
- the photodetector 40 is composed of, for example, a photodiode and photoelectrically converts an optical input signal.
- the optical input signals have different transmission speeds of 62 2 Mb / s, 2.48 Gb / s, and 10 Gb / s.
- the output signal of the optical detector 40 is amplified by the preamplifier 42.
- a variable resistance element 43 whose resistance changes with a bias voltage is provided in the column.
- the signal amplified by the preamplifier 42 is gain-controlled by the AGC amplifier 44 so that the output level becomes constant, and is controlled by the control «] £ generation circuit 45, the clock switching circuit 46, and the identification circuit 48. Supplied. That is, the preamplifier 42 and the AGC amplifier 44 perform equal width.
- the preamplifier 42 that performs feedback with the variable resistance element 4 3 has a narrow frequency bandwidth and a large gain when the bias voltage is high, the resistance value of the variable resistance element 43 is large, and the feedback amount is small.
- the resistance value of the variable resistor 43 when the bias voltage is low, the resistance value of the variable resistor 43 is small, and the feedback amount is large, the frequency bandwidth is wide and the gain is small.
- the resistance value of the element 43 is medium and the feedback amount is medium, it has the characteristic shown by the solid line with the medium frequency bandwidth and the medium gain.
- the control voltage generation circuit 45 includes comparators 50, 52, an exclusive OR circuit 54, an average value detection circuit 56, a correction signal generation circuit 58, and a differential amplifier 62. Have been.
- the comparator 50 compares the output signal of the AGC amplifier 44 with a first reference voltage
- the comparator 52 compares the output signal of the AGC amplifier 44 with a second reference voltage lower than the first reference voltage.
- the output signals of the comparators 50 and 52 are subjected to an exclusive OR operation by an exclusive OR circuit 54.
- the exclusive OR signals obtained, that is, the rising and falling detection signals are obtained by an average value detection circuit 56 and It is supplied to the correction signal generation circuit 58.
- the average value detection circuit 56 detects the average value voltage of the exclusive OR signal and supplies it to the inverting input terminal of the differential amplifier 62.
- the correction signal generation circuit 58 includes a D-type flip-flop 59 and an integrator 60.
- the D-type flip-flop 59 samples the exclusive-OR signal using the reference clock supplied from the clock switching circuit 46, thereby reducing the pulse width of the exclusive-OR signal at least to the reference clock. The period is supplied to the integrator 60.
- the integrator 60 integrates the exclusive OR signal having a fixed pulse width, and supplies the integrated voltage to the non-inverting input terminal of the differential amplifier 62.
- the reference clock identifies the data of the optical input signal with the highest transmission speed of 1 OGb / s. Clock.
- the differential amplifier 62 generates a control voltage by performing differential amplification between the integral voltage and the average voltage. This control is applied as a bias to the variable resistance element 43 and is also supplied to the quick switching circuit 46, and the resistance value of the variable resistance element 43 is variably controlled according to the control.
- the variable resistance element 43 feeds back the output of the preamplifier 42 to the input side.By variably controlling the resistance value of the variable resistance element 43, the gain and frequency bandwidth of the preamplifier 42 are changed, and the optical input signal It is the form that is most suitable for this frequency.
- the pulse width of the exclusive OR signal becomes narrow because the rising and falling edges of the exclusive OR signal are sharp, and the preamplifier 12 If the pass band of the exclusive OR signal is narrow, the rising and falling edges of the exclusive OR signal become gentler, so the pulse width of the exclusive OR signal becomes wider, and the rising and falling of the optical input signal within a certain time
- the control voltage can be generated correctly, the bandwidth can be controlled normally, and the bandwidth can be automatically adjusted without being affected by the input signal pattern. As described above.
- the clock switching circuit 46 includes a clock generator 64, a transmission speed detector 66, and a frequency divider 68.
- the clock generator 64 generates a reference clock synchronized with the clock component included in the output signal of the AGC amplifier 44 using a PLL or SAW filter, and supplies the reference clock to the frequency divider 68 and the D-type flip-flop 59. If the transmission speed of the optical input signal is an integral multiple of 622 Mb / s, 2.48 Gb / s, and 10 Gb / s, the reference clock frequency is However, it is 10 GHz, which corresponds to the optical input signal with the highest transmission speed.
- the transmission rate detector 66 compares the control voltage supplied from the differential amplifier 62 with each of the thresholds VH, VM, and VL to detect the transmission rate of the optical input signal.
- the reference clock is divided according to the detection result of the transmission speed.
- the transmission speed of the optical input signal is 10 bZs in the period T1, 2.48 Gb / s in the period T2, and 6 2 2 in the period T3.
- the level of the control unit changes as shown in FIG. 9 ( ⁇ ).
- Fig. 9 ( ⁇ ⁇ ) shows the thresholds VH, VM, and VL together with the control «J £».
- Figure 10 (A) shows the waveform of the reference clock (1 OGHz), and Figures 10 (B), (C), and (D) show that the transmission speed is 10 Gb / s, 2.4
- the waveform (1 pulse) of the exclusive OR signal output by the D-type flip-flop 59 in each of 8 Gb / s and 62 2 Mb / s is shown.
- FIG. 11 is a circuit configuration diagram of an embodiment of the transmission rate detecting section 66 and the frequency dividing section 68.
- resistors R1, R2, and R3 connected in series divide the power supply voltage Vcc to generate thresholds VH, VM, and VL and supply them to the inverting input terminals of comparators 71, 72, and 73 I do.
- the control voltage from the differential amplifier 62 is input to the terminal 70, and the comparator 71,
- the comparator 71 outputs a low level when the control voltage is lower than the threshold VH, and outputs a high level when the control voltage exceeds the threshold VH.
- the comparator 72 outputs a low-level output when the control is below the threshold VM, and outputs a high-level output when the control exceeds the threshold VM.
- 7 3 is a low level output when the control voltage is less than the threshold value VL, and a high level output when the control voltage exceeds the value VL.
- the output of the comparator 71 is supplied to the inverters 74 and 76 and also to the AND circuit 77.
- the output of the comparator 72 is supplied to the inverter 75, Both are supplied to the AND circuit 78.
- the output of the comparator 73 is supplied to an AND circuit 79.
- the AND circuit 77 When the control voltage exceeds the threshold value VH, the AND circuit 77 outputs a high-level signal and puts the frequency divider 82 into an enable state.
- the frequency divider 82 is supplied from the clock generator 64 via the terminal 81 at a frequency of 10 GHz. Generates a 622 MHz clock by dividing the reference clock by 1/16.
- the AND circuit 78 When the control circuit ⁇ 1 £ is in the range from the threshold value VM to the threshold value VH, the AND circuit 78 outputs a high-level output to enable the frequency divider 83, and the frequency divider 83 divides the reference clock having a frequency of 10 GHz by 1Z4. To generate a clock with a frequency of 2.48 GHz.
- the AND circuit 79 When the control voltage is in the range from the threshold value VL to the threshold value VM, the AND circuit 79 outputs a high-level output to enable the frequency divider 84, and the frequency divider 84 divides the reference clock having a frequency of 10 GHz by 1/1. To generate a clock with a frequency of 10 GHz. Since the frequency divider 84 does not substantially perform frequency division, a transmission gate or the like may be used. The clock output from any of the frequency dividers 82, 83, 84 is supplied to an identification circuit 48 through an OR circuit 85.
- the transmission rate detector 66 compares the control ⁇ with the thresholds VH, VM, and VL, the control voltage is compared with the thresholds VH, VM, and the division ratio is set to 1/16, 1/4, or 1 / It is also possible to determine which one to use, and it is not limited to the above embodiment.
- the discrimination circuit 48 includes a discriminator 48a and a D-type flip-flop 48b.
- the discriminator 48a discriminates the output signal of the AGC amplifier 44, and the D-type flip-flop 48b supplies the signal from the frequency divider 68. Sampling is performed using a clock, and data obtained as a result of identification is output from a terminal 49a, and the clock is output from a terminal 49b.
- clock switching can be performed automatically according to the transmission speed of the input signal, and signal light with different transmission speeds of 622 Mb / s, 2.48 GbZs, and 1 OGb / s can be transmitted by a single optical receiver. Reception can be performed, the circuit scale can be reduced, and the cost can be reduced.
- the average value detection circuit 26, the differential amplifier 32, the comparators 20 and 22 and the exclusive OR circuit 24 correspond to the control signal generation means described in the claims, and the correction signal generation circuit 28 corresponds to the correction signal generation circuit.
- Comparator 20 corresponds to the first comparator
- comparator 22 corresponds to the second comparator
- AGC amplifier 14 corresponds to the AGC means
- data recovery circuit 16 corresponds to the signal generation means.
- the transmission speed detector 66 corresponds to the transmission speed detector
- the clock generator 64 corresponds to the clock generator
- the frequency divider 68 corresponds to the frequency divider.
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- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Optical Communication System (AREA)
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005504696A JP4137120B2 (ja) | 2003-01-27 | 2004-01-26 | 前置増幅回路及びクロック切替え回路及びそれを用いた光受信器 |
US11/043,078 US7389056B2 (en) | 2003-01-27 | 2005-01-27 | Preamplifier circuit, clock switching circuit, and optical receiver |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JPPCT/JP03/00734 | 2003-01-27 | ||
PCT/JP2003/000734 WO2004068702A1 (ja) | 2003-01-27 | 2003-01-27 | 前置増幅回路及びそれを用いた光受信器 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/043,078 Continuation US7389056B2 (en) | 2003-01-27 | 2005-01-27 | Preamplifier circuit, clock switching circuit, and optical receiver |
Publications (2)
Publication Number | Publication Date |
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WO2004068705A1 true WO2004068705A1 (ja) | 2004-08-12 |
WO2004068705A8 WO2004068705A8 (ja) | 2005-01-20 |
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PCT/JP2003/000734 WO2004068702A1 (ja) | 2003-01-27 | 2003-01-27 | 前置増幅回路及びそれを用いた光受信器 |
PCT/JP2004/000647 WO2004068705A1 (ja) | 2003-01-27 | 2004-01-26 | 前置増幅回路及びクロック切替え回路及びそれを用いた光受信器 |
Family Applications Before (1)
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PCT/JP2003/000734 WO2004068702A1 (ja) | 2003-01-27 | 2003-01-27 | 前置増幅回路及びそれを用いた光受信器 |
Country Status (3)
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US (1) | US7389056B2 (ja) |
JP (1) | JP4137120B2 (ja) |
WO (2) | WO2004068702A1 (ja) |
Families Citing this family (4)
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KR100601048B1 (ko) * | 2004-04-22 | 2006-07-14 | 한국전자통신연구원 | 버스트 모드 패킷의 수신기 및 그 패킷의 수신 방법 |
US20060087378A1 (en) * | 2004-10-26 | 2006-04-27 | Hiroshi Hayakawa | Preamplifier circuit having a variable feedback resistance |
US7692486B2 (en) * | 2007-10-05 | 2010-04-06 | Qualcomm, Incorporated | Configurable feedback for an amplifier |
US8369713B2 (en) * | 2010-03-18 | 2013-02-05 | Nippon Telegraph And Telephone Corporation | Bit-rate discrimination method and its apparatus |
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WO2001067597A1 (fr) * | 2000-03-06 | 2001-09-13 | Fujitsu Limited | Preamplificateur |
JP2003023398A (ja) * | 2001-03-26 | 2003-01-24 | Agilent Technol Inc | 光ファイバ受信機 |
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JP2685476B2 (ja) * | 1988-03-07 | 1997-12-03 | 旭化成工業株式会社 | 受信モジュール |
JPH01253305A (ja) * | 1988-04-01 | 1989-10-09 | Toshiba Corp | 光受信器 |
JPH03195107A (ja) | 1989-12-22 | 1991-08-26 | Fujitsu Ltd | 自動帰還抵抗調整機能付き前置増幅器 |
JPH03270308A (ja) | 1990-03-19 | 1991-12-02 | Fujitsu Ltd | 自動利得制御回路 |
JP3257033B2 (ja) | 1992-06-03 | 2002-02-18 | 松下電器産業株式会社 | 自動利得制御増幅装置 |
JPH08223228A (ja) * | 1994-03-17 | 1996-08-30 | Fujitsu Ltd | 等化増幅器及びこれを用いた受信機並びにプリアンプ |
JP3436631B2 (ja) * | 1996-02-22 | 2003-08-11 | 富士通株式会社 | 光送受信回路 |
JP2861996B1 (ja) | 1998-01-30 | 1999-02-24 | 日立電線株式会社 | 光波長合分波器 |
JPH11275030A (ja) * | 1998-03-19 | 1999-10-08 | Fujitsu Ltd | 光受信装置 |
JP2000131541A (ja) | 1998-10-27 | 2000-05-12 | Hitachi Cable Ltd | 光波長合分波器 |
JP2001211035A (ja) * | 2000-01-26 | 2001-08-03 | Mitsubishi Electric Corp | プリアンプおよび光受信器 |
JP2002135214A (ja) * | 2000-10-19 | 2002-05-10 | Mitsubishi Electric Corp | 光受信器 |
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2003
- 2003-01-27 WO PCT/JP2003/000734 patent/WO2004068702A1/ja not_active Application Discontinuation
-
2004
- 2004-01-26 WO PCT/JP2004/000647 patent/WO2004068705A1/ja active Application Filing
- 2004-01-26 JP JP2005504696A patent/JP4137120B2/ja not_active Expired - Fee Related
-
2005
- 2005-01-27 US US11/043,078 patent/US7389056B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03270504A (ja) * | 1990-03-20 | 1991-12-02 | Fujitsu Ltd | 光受信器の等価増幅回路 |
WO2001067597A1 (fr) * | 2000-03-06 | 2001-09-13 | Fujitsu Limited | Preamplificateur |
JP2003023398A (ja) * | 2001-03-26 | 2003-01-24 | Agilent Technol Inc | 光ファイバ受信機 |
Also Published As
Publication number | Publication date |
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US7389056B2 (en) | 2008-06-17 |
WO2004068702A1 (ja) | 2004-08-12 |
US20050128007A1 (en) | 2005-06-16 |
JPWO2004068705A1 (ja) | 2006-05-25 |
JP4137120B2 (ja) | 2008-08-20 |
WO2004068705A8 (ja) | 2005-01-20 |
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