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Polarization multiplexing direct detection system and method

A polarization multiplexing and detection system technology, applied in the field of optical communication, can solve problems such as complex system structure, high cost, and application limitations

Active Publication Date: 2016-01-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a polarization multiplexing direct detection system and method to solve the existing problems of complex system structure, high cost, or application limitations in the prior art

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  • Polarization multiplexing direct detection system and method
  • Polarization multiplexing direct detection system and method

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Embodiment 1

[0087] A polarization multiplexing direct detection system provided by an embodiment of the present invention includes: a laser, a first polarization beam splitter, a first intensity modulator and a second intensity modulator, a polarization beam combiner, a polarization maintaining coupler, a 45° Polarization rotator, second polarization beam splitter, third polarization beam splitter, 4 photodetectors and processor;

[0088] The first polarization beam splitter is used to split the light beam emitted by a laser into two orthogonal polarization states;

[0089] The first intensity modulator and the second intensity modulator are used to respectively perform intensity modulation of two analog electrical signals on two orthogonal polarization states;

[0090] The polarization beam combiner is used to synthesize the intensity-modulated two analog signals into a polarization multiplexing signal;

[0091] The polarization maintaining coupler is used to receive the synthesized pol...

Embodiment 2

[0163] The present invention also provides a specific implementation of a polarization multiplexing direct detection method. Since the polarization multiplexing direct detection method provided by the present invention corresponds to the specific implementation of the aforementioned polarization multiplexing direct detection device, the polarization multiplexing direct detection method The purpose of the present invention can be achieved by executing the process steps in the specific implementation of the above method, so the explanations in the specific implementation of the polarization multiplexing direct detection device above are also applicable to the specific implementation of the polarization multiplexing direct detection method provided by the present invention Embodiments will not be repeated in the following specific embodiments of the present invention.

[0164] like figure 2 As shown, the embodiment of the present invention also provides a polarization multiplexi...

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Abstract

The invention provides a polarization multiplexing direct detection system and a method. The transmission capacity of the system can be doubled. The system comprises a first polarization beam splitter used for dividing a light beam emitted by a laser into two orthogonal states of polarization, first and second intensity modulators used for modulating the intensity of two analog electrical signals on the two orthogonal states of polarization respectively, a polarization beam combiner used for synthesizing the signals after intensity modulation into a polarization multiplexing signal, a polarization maintaining coupler used for dividing the polarization multiplexing signal into two SOPs with a fixed angle therebetween under the cooperation of a 45-degree polarization rotator, second and third polarization beam splitters used for dividing each of the two SOPs into two orthogonal state-of-polarization signals, four photoelectric detectors used for converting the received four state-of-polarization signals into electrical signals, ad a digital signal processor used for estimating the polarization angles of the two SOPs, eliminating mixed polarization flap interference and carrying out polarization de-multiplexing and signal recovery. The system and the method of the invention are applicable to the technical field of optical communication.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a polarization multiplexing direct detection system and method. Background technique [0002] The rapid growth of network traffic continuously drives the demand for optical network bandwidth. Based on the use of powerful digital signal processing (DSP) and coherent detection technology, long-distance optical transmission has experienced a rapid increase in capacity in recent years. However, unlike long-distance transmission networks, short-distance transmission is more sensitive to the cost of transceivers. Compared with the more costly coherent detection, the low-cost intensity-modulated direct detection technique is more attractive for short-distance transmission systems. In order to use bandwidth-limited low-cost optical devices to increase the single-wavelength optical transmission rate, a series of advanced modulation formats combined with intensity modulation...

Claims

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Application Information

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IPC IPC(8): H04J14/06H04B10/54H04B10/532H04B10/66
Inventor 周娴闫凯丽霍佳皓刘伟隆克平
Owner UNIV OF SCI & TECH BEIJING
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