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In-situ power monitor having an extended range to stabilize gain of avalanche photodiodes across temperature variations

A temperature change, avalanche photoelectric technology, applied in discharge tubes, electromagnetic transceivers, photometry, etc., can solve problems such as power monitoring

Inactive Publication Date: 2008-09-03
ALED TELESIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unlike the methods described in Figures 2A and 2B, transimpedance amplifier ("TIA") 312 is used only to amplify the electrical signal representing the data to be transmitted; it is not used for power monitoring

Method used

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  • In-situ power monitor having an extended range to stabilize gain of avalanche photodiodes across temperature variations
  • In-situ power monitor having an extended range to stabilize gain of avalanche photodiodes across temperature variations
  • In-situ power monitor having an extended range to stabilize gain of avalanche photodiodes across temperature variations

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Embodiment Construction

[0027] Fig. 4 is a block diagram of an apparatus for online monitoring of input optical power according to at least one embodiment of the present invention. Device 400 includes an online power monitor 402 for monitoring optical signal 420 . A sense current 408 flowing from a bias source ("bias supply") 406 provides an adjustable bias voltage. In one embodiment, the optical signal detector is APD 418 . Sometimes, resistor 416 and / or capacitor 414 filter current 408 to reduce noise effects, for example. In order to detect and monitor the current 408 , the device 400 also includes a passive element 403 which can replace 416 .

[0028]Note that the current 408 passing through the APD can be expressed by the formula (1): I(APD_current)=Ip×APD(responsitivity)×APD(gain), in the formula (1), Ip represents the luminous flux flowing into the APD 418, and APD(responsitivity) represents The responsivity of the APD 418, APD(gain) represents the gain (or multiplication) of the APD. Note...

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Abstract

Disclosed are an in-line monitoring apparatus with a temperature compensator, an optical receiver and a method for stabilizing gain of an avalanche photodiode (''APD'') over an extended range of input power values and across temperature variations. The apparatus can include one or more power monitoring stages coupled in parallel to the APD for generating one or more measurement signalsin-situ. The apparatus also includes a temperature compensator configured to adjust an operational parameter for the APD as a function of temperature and the measurement signal. The temperature compensator adjusts the bias to maintain a substantially uniform gain across temperature variations to facilitate an increased sensitivity with which to monitor the input power at lower levels than if the temperature compensator did not adjust the bias in response to the temperature. One of the power monitoring stages can be configured to monitor the low-powered optical signals.

Description

field of invention [0001] The present invention relates generally to in-line power monitors and, more particularly, to in-line power monitors for monitoring the input power of optical signal detectors, such as avalanche photodiodes ("APDs"). By monitoring the input power online, the working parameters of the optical signal detector can be determined and controlled in real time. For example, as the temperature of the APD varies, the gain as its operating parameter can be controlled. Background technique [0002] Optical receivers facilitate the transmission of data by detecting optical signals sent over fiber optic cables in optical communication networks. In such networks, optical transmitters modulate optical signals at high frequencies to send them over optical fibers using one or more optical wavelengths. To receive transmitted signals, optical receivers typically use avalanche photodiodes ("APDs") to detect optical signals. As is well known, APDs are photodiodes with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J40/14G01J1/44H04B10/07H04B10/40H04B10/43H04B10/50H04B10/60H04B10/67H04B10/69
CPCG01J1/4257G01J1/44H04B10/66
Inventor S·卡库V·吉洪诺夫
Owner ALED TELESIS
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