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Avalanche photodiode optical receiver

A photodetector and optical signal technology, applied in circuits, electrical components, semiconductor devices, etc., can solve the problems of expensive and bulky optical band-pass filters

Inactive Publication Date: 2003-10-15
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, optical bandpass filters themselves should not be expensive and bulky

Method used

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  • Avalanche photodiode optical receiver
  • Avalanche photodiode optical receiver
  • Avalanche photodiode optical receiver

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Embodiment Construction

[0023] by reference Figure 1 to Figure 8 We can best understand the preferred embodiment of the invention and its advantages by referring to the drawings.

[0024] figure 1 A block diagram illustrating a prior art embodiment of an avalanche photodiode circuit for converting optical signals to electrical signals. exist figure 1 1 , a block 10 includes an avalanche photodiode 12 , an optical signal input 14 , and a DC bias wire 16 . Block 10 provides an output signal on line 17 to a filter block 18 . The filtered signal is output to a signal amplifier 20 . Amplifier 20 outputs the amplified signal to another filter 22 which outputs an electrical signal output on conductor 24 . The two filters 18 and 22 can be low-pass, high-pass, band-pass filters or matching circuits, as astute design practice will allow. We should note that when filters 18 and 22 such as figure 1 As shown, not all applications require them, so they are optional. For example, from figure 1 The filter ...

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Abstract

A photodetector circuit comprising an avalanche photodiode having a signal input for receiving an input optical signal to be converted to an electrical signal. The photodetector circuit further includes biasing circuitry, coupled to the avalanche photodiode, for applying a bias voltage to the avalanche diode. The bias circuitry includes: (1) a dc bias circuit for providing a dc component to the bias voltage for maintaining the avalanche diode in a stable avalanche gain condition when receiving the input optical signal; and (2) a modulating circuit for providing a high frequency modulating component to the bias voltage for modulating the bias voltage in a manner that enhances the operational characteristics of the avalanche photodiode. In particular, the modulating component to the bias voltage decreases the noise of the signal output of the avalanche photodiode for a given average gain, and increases the bandwidth of the signal output of the avalanche photodiode for a given average gain.

Description

technical field [0001] The present invention relates to avalanche photodiode devices, and more particularly to an avalanche photodiode device biased with a modulated power signal. Background technique [0002] After transmitting an optical signal through some transmitting medium, such as an optical fiber, the optical signal is typically converted to an electrical signal by a photodetector. One type of photodetector is an avalanche photodiode. Typically, the optical signal is applied to an avalanche photodiode in a circuit with a DC bias applied across the terminals of the avalanche photodiode. The signal currents associated with the incident optical signal generated by the avalanche photodiode pass through an amplifier. To reduce noise an electrical filter can be used before and / or after the amplifier. Such an application of an avalanche photodiode leads to limitations on sensitivity characteristics related to the characteristics of the avalanche photodiode and the signal...

Claims

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Application Information

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IPC IPC(8): H01L31/02
Inventor 阿里斯特・约翰・普里斯
Owner ALCATEL LUCENT SAS