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A circuit that detects the average optical power at the pina end

An average optical power and circuit technology, applied in the field of optical communication, can solve the problems of increasing the equivalent input noise of the TIA signal channel, affecting the bandwidth of the TIA, low noise characteristics, and sensitivity degradation, etc., to improve the detection range, improve the detection accuracy, and reduce The effect of power consumption

Active Publication Date: 2017-07-11
XIAMEN UX HIGH SPEED IC
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Problems solved by technology

[0005] Furthermore, the problem of monitoring loss: the rear stage of the photodiode needs to be connected to a TIA (transimpedance amplifier). Since the TIA is a high-speed, low-noise circuit, the photocurrent monitoring device introduced cannot affect the bandwidth and low-noise characteristics of the TIA. Good enough isolation state, which is also one of the difficulties in monitoring circuit design
The input terminal of the operational amplifier is directly connected to the input terminal of the TIA, which will form a capacitive load, thereby increasing the equivalent input noise of the TIA signal channel, and reducing the bandwidth, thereby degrading the sensitivity

Method used

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  • A circuit that detects the average optical power at the pina end
  • A circuit that detects the average optical power at the pina end
  • A circuit that detects the average optical power at the pina end

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Embodiment 2

[0054] refer to figure 2 , the difference between this embodiment and embodiment 1 is: the first resistor R f ' and transimpedance R f Both ends of the fourth MOS transistor Mf' and the third MOS transistor Mf are respectively connected in parallel, and the third MOS transistor Mf and the fourth MOS transistor Mf' have the same width-to-length ratio. Guaranteed V OUT with V PINA It has a small distortion, which ensures the detection accuracy and improves the detection range.

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Abstract

The invention provides a circuit for detecting average optical power at the PINA end, comprising: a transimpedance front-end amplifier circuit and a negative feedback network whose input end is a gate; Current I PD converted to a voltage signal V OUT output, and a voltage signal V is generated at the PINK terminal PINA ; The negative feedback network includes the first operational amplifier I0 and the second operational amplifier I1; the voltage signal V OUT Input the negative input terminal of the second operational amplifier I1; the voltage signal V PINA Input the positive input terminal of the first operational amplifier I0; the first resistor R is connected between the negative input terminal of the first operational amplifier I0 and the positive input terminal of the second operational amplifier I1 f ', its resistance and transresistance R f same. The invention provides a circuit for detecting average optical power at the PINA end, which has low power consumption and high detection precision.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a circuit for detecting average optical power. Background technique [0002] In modern optical fiber communication applications, real-time monitoring of optical pulse power transmitted by optical fibers is required to realize intelligent diagnosis of communication faults. To realize the monitoring of the received optical power, the photocurrent of the photodiode can be monitored, and then the optical power can be deduced and converted backwards. In this field, monitoring the photocurrent of the photodiode in the receiving component has the following difficulties: [0003] First, the monitoring photocurrent is small: accurate monitoring of the received optical power usually requires a circuit with high sensitivity. Taking the 1.25Gbps application as an example, such a transmission rate needs to monitor the optical power below -30dBm, which is converted into a photocurrent of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/075
Inventor 陈伟
Owner XIAMEN UX HIGH SPEED IC
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