WO2012137299A1 - 光受信器 - Google Patents
光受信器 Download PDFInfo
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- WO2012137299A1 WO2012137299A1 PCT/JP2011/058592 JP2011058592W WO2012137299A1 WO 2012137299 A1 WO2012137299 A1 WO 2012137299A1 JP 2011058592 W JP2011058592 W JP 2011058592W WO 2012137299 A1 WO2012137299 A1 WO 2012137299A1
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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
- H04B10/69—Electrical arrangements in the receiver
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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
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
- H04B10/6931—Automatic gain control of the preamplifier
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- 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
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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
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
Definitions
- the present invention relates to an optical receiver, and more particularly to an optical receiver applied to a PON (Passive Optical Network) system, which is one of access optical communication systems.
- PON Passive Optical Network
- a PON (Passive Optical Network) system has been widely used as a method for realizing a public line network using optical fibers.
- the PON system is one of point-to-multipoint access optical communication systems.
- the PON system is composed of one OLT (Optical Line Terminal) and multiple ONUs (Optical Network Unit).
- the OLT is a station side device, and the ONU is a subscriber terminal device.
- the OLT and each ONU are connected via an optical star coupler.
- many ONUs can share the OLT and most of the transmission path (optical fiber).
- economics of operating costs can be expected.
- the optical star coupler is a passive component, no power supply is required. Therefore, the optical star coupler can be easily installed outdoors.
- the optical star coupler is also highly reliable. For these reasons, the PON system has been actively introduced in recent years as a trump card for realizing a broadband network.
- GE-PON Gigabit Ethernet-Passive Optical Network
- the transmission rate is 1.25 Gbit / s according to the standard of IEEE 802.3ah.
- a broadcast communication method using signals in the optical wavelength band of 1480 to 1500 nm is used, and each ONU extracts only the data of the assigned time slot.
- a broadcast communication system using signals in the optical wavelength 1260 to 1360 nm band is used, and a time division multiplex communication system that controls transmission timing so that data of each ONU does not collide is used. Used.
- 10G-EPON will be described.
- the transmission speed is 10.3 Gbit / s according to the standard of IEEE 802.3av.
- a broadcast communication method using signals in the optical wavelength band of 1574 to 1580 nm is used, and each ONU extracts only the data of the assigned time slot.
- a signal in the optical wavelength 1260 to 1280 nm band is used, and a time division multiplex communication system that controls transmission timing so that data of each ONU does not collide is used.
- each ONU In the upstream communication of the PON system as described above, each ONU is located at a different distance from the optical star coupler. Therefore, the reception level (light reception level) of each ONU in the OLT is different for each received packet. Therefore, a wide dynamic range characteristic is required for the burst optical receiver for OLT.
- the wide dynamic range characteristic is a characteristic for reproducing burst signals having different reception levels stably and at high speed. Therefore, in general, an OLT burst optical receiver is provided with an AGC (Automatic Gain Control) circuit.
- the AGC circuit is a circuit for changing the conversion gain to a desired gain according to the reception level.
- Each burst signal is composed of an overhead area and a data area.
- the overhead area has a length equal to or longer than Receiver Settling Time.
- the length of the overhead area is short.
- the AGC circuit operates based on the detection result of the average value of the received signal, the same code continuous time and the time constant have a trade-off relationship. For this reason, it is a challenge to achieve both the continuous resistance to the same sign and high-speed response.
- the same code continuous time is a time during which the same code included in the code string of the received signal is continuous.
- Patent Document 1 the time constant of the AGC circuit is switched from high speed operation to low speed operation within one burst signal. Therefore, it is possible to achieve both high-speed response in the overhead area and continuous resistance to the same sign in the data area.
- Patent Document 1 it is difficult to determine the convergence state when the reception level difference between successive burst signal sequences is small. As a result, there is a problem that the time constant cannot be switched at a desired timing.
- Patent Document 2 As in Patent Document 1, since the time constant of the AGC circuit is switched from high speed operation to low speed operation within one burst signal, the high speed response in the overhead area and the same sign in the data area are continuous. Both yield strength can be achieved. However, the time constant is switched at a fixed time with the reset signal as a reference. Therefore, in the above-mentioned patent document 2, when the reception timing of the burst signal and the reception timing of the reset signal fluctuate relatively like the GE-PON system (asynchronous PON system) and the 10G-EPON system described above. Has a problem that the time constant cannot be switched at a desired timing.
- the present invention has been made to solve such a problem, and provides an optical receiver having a wide dynamic range characteristic, a high-speed response, and the same code continuity tolerance, and realizing a high throughput characteristic. For the purpose.
- the present invention detects a light receiving element that converts a light receiving signal into a current signal, a preamplifier that converts a current signal output from the light receiving element into a voltage signal, and an average voltage of the voltage signal from the preamplifier.
- a gain control means for controlling the conversion gain of the preamplifier to a desired gain according to the reception level of the received light signal, and determining whether the gain control means is in a transient state or a steady state
- the gain control means For receiving a reset signal inserted between the convergence determination means and the light reception signal, and for switching the time constant of the gain control means based on one of the output from the convergence determination means and the reset signal Switching signal output means for generating a time constant switching signal, and the gain control means has a first time constant and detects an average voltage of the voltage signal from the preamplifier.
- a first average voltage detector that has a second time constant longer than the first time constant and detects an average voltage of a voltage signal from the preamplifier
- a switching unit for switching to either the first average voltage detection unit or the second average voltage detection unit based on a time constant switching signal, and the reset signal is input to the time constant switching signal
- the first average voltage detection unit is selected, and the convergence determination circuit selects the second average voltage detection unit when it is determined that the gain control circuit has shifted from a transient state to a steady state. It is an optical receiver characterized by being the signal for this.
- the present invention detects a light receiving element that converts a light receiving signal into a current signal, a preamplifier that converts a current signal output from the light receiving element into a voltage signal, and an average voltage of the voltage signal from the preamplifier.
- a gain control means for controlling the conversion gain of the preamplifier to a desired gain according to the reception level of the received light signal, and determining whether the gain control means is in a transient state or a steady state
- the gain control means For receiving a reset signal inserted between the convergence determination means and the light reception signal, and for switching the time constant of the gain control means based on one of the output from the convergence determination means and the reset signal Switching signal output means for generating a time constant switching signal, and the gain control means has a first time constant and detects an average voltage of the voltage signal from the preamplifier.
- a first average voltage detector that has a second time constant longer than the first time constant and detects an average voltage of a voltage signal from the preamplifier
- a switching unit for switching to either the first average voltage detection unit or the second average voltage detection unit based on a time constant switching signal, and the reset signal is input to the time constant switching signal
- the first average voltage detection unit is selected, and the convergence determination circuit selects the second average voltage detection unit when it is determined that the gain control circuit has shifted from a transient state to a steady state. Therefore, the optical receiver is characterized by having a wide dynamic range characteristic, a high-speed response, and the same code continuity tolerance, and can realize a high throughput characteristic.
- FIG. 3 It is a block diagram which shows the structure of the optical receiver which concerns on Embodiment 1 of this invention.
- 3 is a timing chart showing signal waveforms at various parts in the optical receiver according to the first embodiment of the present invention. It is explanatory drawing which shows the receivable range with respect to a reception level, the operation range of a gain control circuit, and the determination possible range of a convergence determination circuit in the optical receiver which concerns on Embodiment 2 of this invention.
- FIG. 1 is a diagram showing a configuration of an optical receiver according to Embodiment 1 of the present invention.
- reference numeral 1 denotes a light receiving element that converts a received light reception signal 13 (burst signal string) into a current signal.
- the light reception signal 13 is a burst signal sequence composed of a plurality of continuous burst signals.
- a preamplifier 2 converts the current signal into a voltage signal.
- a gain control circuit 9 performs gain control (AGC) of the preamplifier 2.
- AGC gain control
- the gain control circuit 9 detects the average voltage of the voltage signal from the preamplifier 2 and controls the conversion gain of the preamplifier 2 to be a desired gain according to the reception level of the light reception signal 13 based on the average voltage. To do.
- a convergence determination circuit 10 controls the time constant of the gain control circuit 9. The convergence determination circuit 10 detects whether the gain control circuit 9 is in a transient state or a steady state, and outputs a time constant switching signal 14 for switching the time constant of the gain control circuit 9 based on the detection result or the reset signal 12. To do.
- the light receiving element 1 When the light receiving element 1 receives the light receiving signal 13, it linearly converts the light receiving signal 13 into a current signal.
- the current signal is converted into an optimum voltage signal in the preamplifier 2 under the control of the gain control circuit 9.
- the gain control circuit 9 operates to respond with an optimal time constant based on the time constant switching signal from the convergence determination circuit 10.
- the gain control circuit 9 includes a time constant selection type average value detection circuit 3 and a level conversion circuit 8.
- the level conversion circuit 8 converts the output of the time constant selection type average value detection circuit 3 into a desired voltage.
- the time constant selection type average value detection circuit 3 includes a high-speed time constant unit 31, a low-speed time constant unit 32, and a changeover switch 33.
- the high-speed time constant unit 31 has a short time constant (first time constant) and detects the average voltage of the voltage signal from the preamplifier 2 (first average voltage detection unit).
- the low-speed time constant unit 32 has a time constant (second time constant) longer than the first time constant, and detects the average voltage of the voltage signal from the preamplifier 2 (second average voltage detection unit).
- the changeover switch 33 selects one of the high-speed time constant unit 31 and the low-speed time constant unit 32 in accordance with the time constant switching signal 14 and inputs the average voltage detected by the selected one to the level conversion circuit 8.
- the time constant selection type average value detection circuit 3 responds at high speed, while when the low-speed time constant unit 32 is selected by the changeover switch 33
- the time constant selection type average value detection circuit 3 responds at a low speed.
- the convergence determination circuit 10 includes a time constant selection type average value detection circuit 4, a difference voltage amplification circuit 5, a comparison circuit 6, a logic circuit 7, and the time constant selection type average value detection circuit 3. Yes.
- the time constant selection type average value detection circuit 3 is shared by the gain control circuit 9 and the convergence determination circuit 10.
- the time constant selection type average value detection circuit 4 includes a high speed time constant unit 41, a low speed time constant unit 42, and a changeover switch 43.
- the high-speed time constant unit 41 has a time constant (third time constant) that is longer than the first time constant and shorter than the second time constant, and detects the average voltage of the voltage signal from the preamplifier 2 ( Third average voltage detection unit).
- the low-speed time constant unit 42 has a time constant (fourth time constant) equivalent to the second time constant, and detects the average voltage of the voltage signal from the preamplifier 2 (fourth average voltage detection unit).
- the changeover switch 43 selects one of the high-speed time constant unit 41 and the low-speed time constant unit 42 and inputs the average voltage detected by the selected one to the differential voltage amplification circuit 5.
- the time constant selection type average value detection circuit 4 responds at high speed, while when the low-speed time constant unit 42 is selected by the changeover switch 43.
- the time constant selection type average value detection circuit 4 responds at a low speed.
- the difference voltage amplifier circuit 5 is a circuit for detecting a difference voltage between the output of the time constant selection type average value detection circuit 3 and the output of the time constant selection type average value detection circuit 4, and amplifies the detected difference voltage. Output.
- the comparison circuit 6 compares the output level of the differential voltage amplification circuit 5 with a predetermined threshold voltage 11 set in advance.
- the logic circuit 7 generates a time constant switching signal based on at least one of the output signal from the comparison circuit 6 and the reset signal 12 input from the outside, and inputs the time constant switching signal to the changeover switches 33 and 43.
- the first time constant of the high-speed time constant unit 31 and the second time constant of the low-speed time constant unit 32 in the time constant selection type average value detection circuit 3 and the high-speed time of the time constant selection type average value detection circuit 4 are as follows.
- the third time constant of the constant part 41 and the fourth time constant of the low speed time constant part 42 have the following relationship.
- the first time constant of the high-speed time constant unit 31 is the shortest.
- the third time constant of the high speed time constant unit 41 is longer than the first time constant of the high speed time constant unit 31.
- the second and fourth time constants of the low speed time constant units 32 and 42 are longer than the third time constant of the high speed time constant unit 41. Note that the second time constant of the low speed time constant 32 is the same as the fourth time constant of the low speed time constant unit 42.
- FIG. 2 is a timing chart showing signal waveforms at various parts in FIG.
- the light reception signal 13 is composed of a continuous burst signal sequence. However, in FIG. 2, only one burst signal 13a is shown. Each burst signal 13 a is transmitted so as not to collide with each other by time division multiplexing, and is received by the light receiving element 1.
- a reset signal 12 issued from a PON-MAC that controls timing is inserted between the burst signals 13a. Using the rising edge of the reset signal 12 as a trigger, the logic circuit 7 outputs the time constant switching signal 14 so that the time constants of the time constant selection type average value detection circuit 3 and the time constant selection type average value detection circuit 4 become high speed. To do.
- the selector switches 33 and 43 select the high-speed time constant units 31 and 41, respectively, based on the time constant switching signal 14.
- the high side is represented as a high speed time constant
- the low side is represented as a low speed time constant.
- the convergence determination circuit 10 determines that the gain control circuit 9 is in a transient state by the input of the reset signal 12 to the logic circuit 7, and selects a high-speed time constant.
- the time constants of the time constant selection type average value detection circuit 3 and the time constant selection type average value detection circuit 4 are on the high speed side. Gain control is performed at high speed so as to obtain an optimum gain for the reception level 13a.
- the third time constant of the high-speed time constant unit 41 of the time constant selection type average value detection circuit 4 is more than the first time constant of the high-speed time constant unit 31 of the time constant selection type average value detection circuit 3. Is set to be slow. Thereby, the output of the high speed time constant unit 41 of the time constant selection type average value detection circuit 4 responds later than the output of the high speed time constant unit 31 of the time constant selection type average value detection circuit 3.
- a potential difference is generated between the output of the time constant selection type average value detection circuit 3 and the output of the time constant selection type average value detection circuit 4.
- the potential difference is detected by the difference voltage amplifier circuit 5, amplified to a desired potential difference, and output.
- the output from the differential voltage amplification circuit 5 is input to the comparison circuit 6.
- the comparison circuit 6 compares the output from the differential voltage amplification circuit 5 with a preset threshold voltage 11.
- the comparison circuit 6 outputs a high-side signal at the timing when the output from the differential voltage amplification circuit 5 becomes equal to or higher than the threshold voltage 11 in the comparison.
- the conversion gain of the preamplifier 2 is controlled by the gain control circuit 9, and the output of the time constant selection type average value detection circuit 4, which is slower than the time constant selection type average value detection circuit 3, becomes closer to the steady state from the transient state. Therefore, the potential difference between the output of the time constant selection type average value detection circuit 3 and the output of the time constant selection type average value detection circuit 4 becomes small.
- the comparison circuit 6 outputs a low-side signal at a timing when the output from the differential voltage amplification circuit 5 falls below the threshold voltage 11. That is, the comparison circuit 6 outputs a high-side signal with respect to the received burst signal when the gain control operation is not completed (transient state), and is low when the gain control operation is completed (steady state). It operates to output the signal.
- the logic circuit 7 uses the falling edge of the output signal of the comparison circuit 6 as a trigger, the logic circuit 7 causes the time constant switching signal so that the time constants of the time constant selection type average value detection circuit 3 and the time constant selection type average value detection circuit 4 become low speed. 14 is output.
- the change-over switches 33 and 43 select the low-speed time constant units 32 and 42, respectively, based on the time constant switching signal 14.
- the convergence determination circuit 10 determines that the gain control circuit 9 has shifted from the transient state to the steady state at the timing when the output from the differential voltage amplifier circuit 5 becomes less than the threshold voltage 11, and has a low time constant. Select.
- the time constants of the time constant selection type average value detection circuit 3 and the time constant selection type average value detection circuit 4 continue to hold the low speed side until the end of one burst signal 13a.
- the time constant switching signal 14 for increasing the time constant is output again, and the time constant selection type average value detection circuit 3 and the time constant are output.
- the time constant of the selective average value detection circuit 4 is switched to the high speed side to prepare for the next burst signal 13a.
- high-speed response is realized by performing high-speed gain control near the head of the burst signal with respect to the received burst signal, and further, after gain control is completed.
- gain control is completed.
- the preamplifier 2 capable of changing the conversion gain according to the reception level of the received burst signal, and the time constant are switched between high speed and low speed.
- a convergence determination circuit 10 that outputs a time constant switching signal 14 according to the state (transient state or steady state) of the gain control circuit 9 and a reset signal between burst signals, The time constant of the gain control circuit 9 can be switched at an appropriate timing.
- FIG. FIG. 3 is a diagram illustrating a range 50 in which the gain control circuit 9 operates and a range 51 in which the convergence determination circuit 10 can determine, with respect to the reception level, in the optical receiver according to Embodiment 2 of the present invention.
- the value of the threshold voltage 11 is appropriately set so that the range 50 of the gain control circuit 9 falls within the range 51 of the convergence determination circuit 10.
- the threshold voltage 11 is input to the comparison circuit 6 as shown in FIG. Thereby, the convergence determination circuit 10 can always determine the reception level at which the gain control circuit 9 operates.
- gain control is generally not performed near the minimum reception sensitivity in order to increase sensitivity. That is, it operates at the maximum gain in the vicinity of the minimum reception sensitivity, and operates so that the gain decreases when the reception level is large in order to suppress waveform distortion and avoid circuit saturation.
- the maximum output amplitude of the differential voltage amplifier circuit 5 in FIG. 1 is less than the threshold voltage 11 will be described.
- the output voltage of the comparison circuit 6 keeps the low side from the beginning to the end of one burst signal. Therefore, the time constant selection type average value detection circuit 3 always operates at a high speed.
- the time constant selection type average value detection circuit 3 determines whether the time constant selection type average value is obtained when the same sign continues. Since the output of the detection circuit 3 follows at high speed, a large gain fluctuation occurs and it is difficult to stably reproduce the burst signal.
- the threshold voltage input to the comparison circuit 6 is appropriately set so that the convergence determination circuit 10 can always make a determination in the range 50 in which the gain control circuit 9 operates.
- the threshold voltage 11 of the comparison circuit 6 is smaller than the difference voltage between the time constant selection type average value detection circuit 3 and the time constant selection type average value detection circuit 4.
- the value of the threshold voltage 11 may be set in advance based on the design value in the design stage, or may be appropriately changed based on the output from the differential voltage amplifier circuit 5.
- the threshold voltage 11 is set to an appropriate value so that the convergence determination circuit 10 can always determine within the range 50 in which the gain control circuit 9 operates.
- the burst optical receiver according to the second embodiment has a wide dynamic range characteristic for stably reproducing burst signals of different reception levels, and has both high-speed response and continuous strength of the same sign. Therefore, it is possible to realize a burst optical receiver excellent in high throughput characteristics.
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Abstract
Description
図1は、本発明の実施の形態1に係る光受信器の構成を示す図である。本実施の形態1においては、光受信器として、PONシステムに適用されるバースト信号に対応可能な光受信器を、例に挙げて説明する。図1において、1は、受信した受光信号13(バースト信号列)を電流信号に変換する受光素子である。受光信号13は、複数の連続するバースト信号から構成されたバースト信号列である。2は、当該電流信号を電圧信号に変換するプリアンプである。9は、プリアンプ2の利得制御(AGC)を行う利得制御回路である。利得制御回路9は、プリアンプ2からの電圧信号の平均電圧を検出し、当該平均電圧に基づいて、プリアンプ2の変換利得を、受光信号13の受信レベルに応じた所望の利得になるように制御する。10は、利得制御回路9の時定数を制御する収束判定回路である。収束判定回路10は、利得制御回路9が過渡状態か定常状態かを検出して、当該検出結果またはリセット信号12に基づいて利得制御回路9の時定数を切り替えるための時定数切替信号14を出力する。
受光素子1は受光信号13を受信すると、受光信号13を電流信号に線形変換する。当該電流信号は、利得制御回路9の制御に従って、プリアンプ2において、最適な電圧信号に変換される。利得制御回路9は、収束判定回路10からの時定数切替信号に基づいて、最適な時定数で応答するよう動作する。
図3は、本発明の実施の形態2に係る光受信器における、受信レベルに対する、利得制御回路9が動作する範囲50と、収束判定回路10が判定可能な範囲51とを示す図である。本実施の形態2においては、図3に示すように、利得制御回路9の範囲50が、収束判定回路10の範囲51の範囲内になるように、閾値電圧11の値を適切に設定する。なお、閾値電圧11は、図1に示すように、比較回路6に入力されるものである。これにより、利得制御回路9が動作する受信レベルでは、必ず、収束判定回路10が判定可能となる。
Claims (3)
- 受光信号を電流信号に変換する受光素子と、
前記受光素子から出力される電流信号を電圧信号に変換するプリアンプと、
前記プリアンプからの電圧信号の平均電圧を検出し、検出した前記平均電圧を用いて、前記プリアンプの変換利得を、前記受光信号の受信レベルに応じた所望の利得になるように制御する利得制御手段と、
前記利得制御手段が過渡状態か定常状態かを判定する収束判定手段と、
前記受光信号間に挿入されたリセット信号を受けて、前記収束判定手段からの出力および前記リセット信号のいずれか1つに基づいて、前記利得制御手段の時定数を切り替えるための時定数切替信号を生成する切替信号出力手段と
を備え、
前記利得制御手段は、
第1の時定数を有し、前記プリアンプからの電圧信号の平均電圧を検出する第1の平均電圧検出部と、
前記第1の時定数よりも長い第2の時定数を有し、前記プリアンプからの電圧信号の平均電圧を検出する第2の平均電圧検出部と、
前記時定数切替信号に基づいて、前記第1の平均電圧検出部か前記第2の平均電圧検出部のいずれかに切り替える切替部と
を備え、
前記時定数切替信号は、
前記リセット信号が入力された場合に、前記第1の平均電圧検出部を選択し、
前記収束判定回路が前記利得制御回路が過渡状態から定常状態に移行したと判定した場合に、前記第2の平均電圧検出部を選択する
ための信号である
ことを特徴とする光受信器。 - 前記収束判定手段は、
前記第1の平均電圧検出部の第1の時定数よりも長く、かつ、前記第2の平均電圧検出部の第2の時定数よりも短い第3の時定数を有し、前記プリアンプからの電圧信号の平均電圧を検出する第3の平均電圧検出部と、
前記第2の平均電圧検出部と同等の第4の時定数を有し、前記プリアンプからの電圧信号の平均電圧を検出する第4の平均電圧検出部と
前記第1の平均電圧検出部で検出した平均電圧と前記第3の平均電圧検出部で検出した平均電圧との差電圧を求める差電圧検出部と、
前記差電圧と所定の閾値電圧とを比較し、比較結果に基づいて、前記利得制御回路が過渡状態か定常状態かを検出する比較部と
を備え、
前記時定数切替信号は前記収束判定手段の時定数も切り替えるものであって、
前記時定数切替信号は、
前記リセット信号が入力された場合に、前記第3の平均電圧検出部を選択し、
前記収束判定回路が前記利得制御回路が過渡状態から定常状態に移行したと判定した場合に、前記第4の平均電圧検出部を選択する
ための信号である
ことを特徴とする請求項1に記載の光受信器。 - 前記利得制御回路が動作する受信レベル範囲において、前記比較部の閾値電圧が、前記第1の平均電圧検出部と前記第3の平均電圧検出部との差電圧より小さい値であることを特徴とする請求項1または2に記載の光受信器。
Priority Applications (6)
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PCT/JP2011/058592 WO2012137299A1 (ja) | 2011-04-05 | 2011-04-05 | 光受信器 |
CN201180057707.0A CN103229435B (zh) | 2011-04-05 | 2011-04-05 | 光接收器 |
JP2012532798A JP5279956B2 (ja) | 2011-04-05 | 2011-04-05 | 光受信器 |
US14/003,139 US9094134B2 (en) | 2011-04-05 | 2011-04-05 | Optical receiver |
EP11863096.1A EP2696519B1 (en) | 2011-04-05 | 2011-04-05 | Optical receiver |
KR1020137025913A KR101519443B1 (ko) | 2011-04-05 | 2011-04-05 | 광 수신기 |
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PCT/JP2011/058592 WO2012137299A1 (ja) | 2011-04-05 | 2011-04-05 | 光受信器 |
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WO2012137299A1 true WO2012137299A1 (ja) | 2012-10-11 |
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US (1) | US9094134B2 (ja) |
EP (1) | EP2696519B1 (ja) |
JP (1) | JP5279956B2 (ja) |
KR (1) | KR101519443B1 (ja) |
CN (1) | CN103229435B (ja) |
WO (1) | WO2012137299A1 (ja) |
Cited By (2)
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US9628194B2 (en) * | 2014-06-05 | 2017-04-18 | Mitsubishi Electric Corporation | Burst-signal reception circuit |
JPWO2016035374A1 (ja) * | 2014-09-03 | 2017-04-27 | 三菱電機株式会社 | 光受信器、光終端装置および光通信システム |
Families Citing this family (5)
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US9374172B2 (en) * | 2010-04-21 | 2016-06-21 | Nec Corporation | Optical receiver, optical reception device, and correction method for optical received intensity |
CN103477575A (zh) * | 2011-04-20 | 2013-12-25 | 富士通光器件株式会社 | 检测装置、光接收装置、检测方法以及光接收方法 |
JP5811955B2 (ja) * | 2012-06-05 | 2015-11-11 | 住友電気工業株式会社 | バースト信号の受信装置及び方法、ponの局側装置、ponシステム |
KR101854054B1 (ko) * | 2013-08-07 | 2018-05-02 | 미쓰비시덴키 가부시키가이샤 | 전류 전압 변환 회로, 광 수신기 및 광 종단 장치 |
JP6524255B2 (ja) * | 2015-11-27 | 2019-06-05 | 三菱電機株式会社 | 光受信器、光通信装置および制御方法 |
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- 2011-04-05 CN CN201180057707.0A patent/CN103229435B/zh active Active
- 2011-04-05 US US14/003,139 patent/US9094134B2/en active Active
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EP2696519B1 (en) | 2018-07-04 |
CN103229435A (zh) | 2013-07-31 |
KR101519443B1 (ko) | 2015-05-12 |
EP2696519A1 (en) | 2014-02-12 |
KR20130130854A (ko) | 2013-12-02 |
JPWO2012137299A1 (ja) | 2014-07-28 |
CN103229435B (zh) | 2015-05-06 |
EP2696519A4 (en) | 2014-09-24 |
US20130343769A1 (en) | 2013-12-26 |
US9094134B2 (en) | 2015-07-28 |
JP5279956B2 (ja) | 2013-09-04 |
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