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Optical transmission system, optical transmission device, and optical reception device

A technology of optical transmission and optical transmission, which is applied in the field of optical transmission system, can solve problems such as unbalanced and excessive signal quality degradation, and achieve the effect of reducing nonlinear interference and improving transmission quality

Inactive Publication Date: 2016-03-30
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is a problem that the nonlinear interference generated between Ex-Ey cannot be equalized by the linear adaptive equalizer in the receiver, resulting in excessive degradation of signal quality

Method used

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  • Optical transmission system, optical transmission device, and optical reception device
  • Optical transmission system, optical transmission device, and optical reception device
  • Optical transmission system, optical transmission device, and optical reception device

Examples

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Embodiment approach 1

[0040] figure 1 It is a diagram showing a configuration example of an optical transmission system according to Embodiment 1 of the present invention. Such as figure 1 As shown, the optical transmission system of this embodiment includes an optical transmission unit (optical transmission device) 100 , an optical transmission unit 200 , and an optical reception device 1000 . The light receiving device 1000 includes a light receiving unit 300 and a received electrical signal processing unit 400 . The same applies to the optical transmission system described in the following embodiments. The optical signal sent from the optical transmission unit 100 reaches the light reception unit 300 via the optical transmission unit 200 . The received optical signal is converted into an electrical signal by the light receiving unit 300 and then electrically processed by the received electrical signal processing unit 400 .

[0041] The optical transmission unit 100 includes a first electri...

Embodiment approach 2

[0132] In Embodiment 2 of the present invention, a CSRZ (Carrier Suppressed Return to Zero) modulation is used for the pulse modulation in Embodiment 1 described above.

[0133] Figure 13 It is a figure which shows the structural example of the optical transmission system of this embodiment. For those with Embodiment 1 figure 1 The structures with the same functions are attached with the same symbols, and repeated explanations are omitted. The optical transmission system of this embodiment includes an optical transmission unit (optical transmission device) 800 , an optical transmission unit 200 , and an optical reception device 1000 . As shown in the figure, the optical transmission unit 800 includes a first electrical signal source 801, a second electrical signal source 802, electrical amplifiers 803-A, 803-B, 803-C, 803-D, a light source 804, and a Mach-Zehnder modulation device 805. The functions of the light transmitting unit 200 , the light receiving unit 300 , and ...

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Abstract

In an optical transfer system according to the present invention, an optical transmission unit 100 generates an optical signal in which respective polarization components are alternately present on a time axis, a time period during which the respective polarization components are simultaneously present on the time axis is substantially zero, and a symbol repetition cycle of optical signals of the respective polarization components becomes Ts, an optical reception unit 300 causes an interference between local oscillation light and a received optical signal and converts an interfered optical signal to an electric signal, and a received electric-signal processing unit 400 performs analog-digital conversion of an electric signal, elimination of a delay difference of Ts / 2 between the respective polarized signal components, and adaptive equalization of a distortion other than the delay difference.

Description

technical field [0001] The present invention relates to an optical transmission system, an optical transmitting device, and an optical receiving device using a digital coherent method. Background technique [0002] For large-capacity optical transmission such as 40Gbit / s and 100Gbit / s, overcoming the noise power limit of optical signals and high-density wavelength division multiplexing are issues. As a technology to overcome the limit of optical signal to noise power, compared with the conventional on-off keying (On-OffKeying: OOK), known binary phase shift modulation (BinaryPhase-ShiftKeying: BPSK, binary phase shift keying), quaternary phase shift keying The use of PSK (QuaternaryPhase-ShiftKeying: QPSK, Quaternary Phase Shift Keying). In addition, for high-density wavelength division multiplexing, there is known a method of doubling the number of transmission bits per symbol by assigning independent signals to two orthogonal polarization components, such as QPSK. , 16-v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/532H04B10/61H04J14/00H04J14/06H04B10/50
CPCH04B10/5053H04B10/532H04B10/616H04J14/002H04J14/06
Inventor 吉田刚杉原隆嗣石田和行水落隆司
Owner MITSUBISHI ELECTRIC CORP
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