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Optical transmitter

An optical transmitter and light wave technology, applied in the field of optical access network, can solve the problems of increasing system cost, high implementation cost, and difficult integration of equipment, and achieve the effect of system cost saving and easy implementation

Active Publication Date: 2014-01-15
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. If this method is applied to the ONU side, at each ONU, the external injection locking mode requires an additional light source, thereby increasing the system cost;
[0008] 2. In the existing system, the external injection light source is regarded as an independent device, therefore, the device is not easy to be integrated into the ONU module unit;
[0009] 3. The external seed light source is an active device, and its on / off state needs to be controlled
[0015] However, tunable lasers are very expensive devices
In particular, NG-PON2 needs to support a splitting ratio greater than or equal to 1:64, which means that at least 64 tunable lasers are required in the ONU transmitter, which will lead to a huge implementation cost, thus inevitably limiting the TWDM- Large-scale deployment of PON system

Method used

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no. 1 example

[0043] According to an embodiment of the present invention, a TDM optical transmitter 4 structure is proposed. The structure consists of three parts, as shown in Figure 4(a),

[0044] 1) The commercial FP-LD 40 is the original light source, which has multi-longitudinal-mode output (Multi-Longitudinal-Mode, MLM);

[0045] 2) 1-to-2 optical coupler 41, its light splitting ratio is 5%:95%, the part with the ratio of 95% is used as the output port, and the part with 5% is used to feed into the FBG. The optical coupler is only the splitting and combining of optical power, the content of the signal is exactly the same, but the magnitude of the optical power is different. The optical power splitting ratio in the present invention is 5%:95%. Of course, the above-mentioned ratio of 5%:95% is only an example, and those skilled in the art can adjust it according to actual needs.

[0046] 3) The FBG 42 is used as an optical filtering device and a light reflecting device at the same tim...

no. 2 example

[0061] Below, referring to Figure 6 and Figure 7 , to describe another embodiment of the present invention.

[0062] According to another embodiment of the present invention, the structure of the TWDM optical transmitter 6 is proposed. The structure 6 includes three parts, as shown in Figure 6(a),

[0063] 1) The commercial FP-LD 60 is the original light source, which has multi-longitudinal-mode output (Multi-Longitudinal-Mode, MLM);

[0064] 2) 1-to-2 optical coupler 61, its light splitting ratio is 5%:95%, the part with the ratio of 95% is used as the output port, and the part with 5% is used to feed into the FBG. The optical coupler is only the splitting and combining of optical power, the content of the signal is exactly the same, but the magnitude of the optical power is different. The optical power splitting ratio in the present invention is 5%:95%. Of course, the above-mentioned ratio of 5%:95% is only an example, and those skilled in the art can adjust it accordin...

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Abstract

The invention provides an optical transmitter. The optical transmitter includes the following components that: a Fabry-Perot laser diode which can generate multi-longitudinal-mode optical waves and can be driven by electric signals, and can modulate the electric signals to the multi-longitudinal-mode optical waves and output modulated multi-longitudinal-mode optical waves; and an optical coupler which is coupled with the Fabry-Perot laser diode and is used for feeding the modulated multi-longitudinal-mode optical waves from the Fabry-Perot laser diode into a fiber bragg grating. The fiber bragg grating filters received multi-longitudinal-mode optical waves according to predetermined parameters, and feeds back optical signals which are generated through filtering to the optical coupler. The optical coupler splits the optical signals, so that the optical signals can be oscillated between the Fabry-Perot laser diode and the fiber bragg grating, and therefore, an oscillation cavity can be formed, and single-mode optical waves with stable wavelength and power can be outputted.

Description

technical field [0001] The present invention relates to an optical access network, in particular to an optical transmitter in the field of optical access network. Background technique [0002] In the current TDM-PON system, FP-LD (Fibry-Perot Laser Diode, Fabry-Perot laser diode, also known as Fabry-Perot semiconductor laser) is because of its low cost, easy operation and simple manufacturing process. And it is widely used as the transmitter of optical network unit (ONU), such as figure 1 shown. figure 1 shows an optical line terminal 11 (Optical Line Terminal, OLT, which is a central office device), a remote node 12 (Remote Node, RN) and an optical network unit 13 (Optical Network Unit, which is a terminal device). Wherein, the optical line terminal 11 includes a downlink transmitter 111 , an uplink receiver 113 , and an arrayed waveguide grating (Arrayed Waveguide Grating, AWG) 112 . The remote node includes an optical splitter 121 . The ONU 33 includes an arrayed wave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50
CPCH01S5/141H04B10/506H04B10/572H01S3/1055H01S5/06216H01S5/0654H04B10/516H04J14/08
Inventor 昌庆江高震森
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD