Light receiving device

A technology of optical reception and optical signal, which is applied in electromagnetic receivers, optical fiber transmission, gain control, etc., can solve the problems of large volume, high cost, and limited dynamic range of optical communication systems, and achieve the effect of improving link performance

Pending Publication Date: 2021-12-03
MOLEX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As a result, the existing optical communication system needs to additionally include the adjustable optical attenuator, the optical splitter, and the optical detector in addition to the basic components such as the optical transmitting device, the optical fiber, and the optical receiving device, resulting in the current Optical communication systems have larger volume and higher cost
In addition, the optical receiving device has a relatively limited dynamic range with respect to the input power of the optical signal

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0070] see figure 1 , an embodiment of the optical receiving device 1 of the present invention is suitable for an optical communication system 10 . The optical communication system 10 includes a light emitting device 2 and an optical fiber 3 . The light emitting device 2 is used for emitting a multi-order pulse amplitude modulation (PAM-N) optical signal Ls, and transmits the optical signal Ls to the light receiving device 1 through the optical fiber 3 . The optical signal Ls is an at least fourth-order multi-order pulse amplitude modulation signal. In this embodiment, the optical signal Ls is taken as an example of a fourth-order pulse amplitude modulation signal, but it is not limited to this.

[0071] The light receiving device 1 of this embodiment includes a conversion module 11 , a signal generation module 12 , a control module 13 , and a multi-order pulse amplitude demodulator 14 .

[0072]The conversion module 11 is used for receiving the optical signal Ls from the o...

no. 2 example

[0090] see Figure 7 , the second embodiment of the optical receiving device 1 of the present invention is similar to the first embodiment, the difference between the two is that in the second embodiment: (1) a conversion module 11a is used to replace the first embodiment. The conversion module 11 (see figure 1), the conversion module 11a includes a photoelectric converter 114 and a bias voltage generator 115; and (2) the power detector 121 is electrically connected to the photoelectric converter 114 rather than the photodetector 113 (see figure 1 ).

[0091] The photoelectric converter 114 receives a bias voltage Vb and is used to receive the optical signal Ls from the optical fiber 3 . The photoelectric converter 114 adjusts a gain of itself according to the bias voltage Vb (for example, when the bias voltage Vb increases, the gain of the photoelectric converter 114 increases accordingly), and performs photoelectric conversion on the optical signal Ls and amplification to...

no. 3 example

[0095] see Figure 8 , the third embodiment of the optical receiving device 1 of the present invention is used in another optical communication system, and the other optical communication system is a wavelength division multiplexing (Wavelength Division Multiplexing, WDM) transmission system. The third embodiment is similar to the first embodiment, except that in the third embodiment: (1) the optical signal Ls has a plurality of multi-order pulse amplitude modulation signals each of which is at least a fourth order (In this embodiment, it is assumed that each multi-level pulse amplitude modulation signal is a fourth-order pulse amplitude modulation signal, but it is not limited to this); (2) a plurality of photocurrent parts Pc1-Pcn constitute the photocurrent Pc ( See figure 1 ), multiple gain signal parts Gs1~Gsn form the gain signal Gs (see figure 1 ), a plurality of measurement signal parts Ms1-Msn form the measurement signal Ms, and a plurality of voltage signal parts V...

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Abstract

A light receiving device comprises a conversion module, a signal generation module and a control module. The conversion module performs photoelectric conversion and amplification on an optical signal to generate a light current, and the signal generation module provides a gain signal and performs resistance conversion and amplification on the light current according to an input signal indicating a predetermined output voltage swing to generate a voltage signal. The signal generation module also receives the light current and generates a measurement signal indicating an average light power related to the light signal according to the light current. The control module outputs a variable control signal to adjust a gain of the conversion module, so that a dynamic range of the conversion module is changed along with the change of the gain of the conversion module.

Description

technical field [0001] The present invention relates to a device, in particular to a light receiving device. Background technique [0002] The existing optical communication system includes a light emitting device, an optical fiber, a light receiving device, an adjustable optical attenuator, a light splitter, and a light detector. [0003] The optical emitting device is used for emitting a multi-order pulse amplitude modulated optical signal, and transmits the optical signal to the optical splitter through the optical fiber and the adjustable optical attenuator in sequence. The optical splitter divides the received optical signal into a first optical signal and a second optical signal, and transmits the first and second optical signals to the light detector and the light receiving device respectively. The light receiving device performs photoelectric conversion, amplification and demodulation on the received second light signal, so as to generate a digital data output for u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25H04B10/50H04B10/60
CPCH04B10/50H04B10/60H04B10/693H04B10/673H03G3/3084H04B10/69H04B10/0795H04B10/671H04B10/6931
Inventor 蔡坤廷梁耀文庄荣敏陈威宏
Owner MOLEX INC
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