Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON)

A technology of optical line terminal and wavelength, which is applied in the direction of optical multiplexing system, multiplexing system selection device, wavelength division multiplexing system, etc., and can solve the problems of large-scale application and popularization of WDM-PON system, etc. Achieve the effect of reducing the difficulty of sending and receiving technology, reducing costs, and reducing the difficulty of upgrading

Active Publication Date: 2011-03-16
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are difficulties in the large-scale application and popularization of WDM-PON systems

Method used

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  • Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON)
  • Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON)
  • Passive optical network (PON) system as well as optical line terminal (OLT) and wavelength route unit in passive optical network (PON)

Examples

Experimental program
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Effect test

Embodiment 1

[0032] In the hybrid passive optical network system of this embodiment, the downlink signal adopts the time division multiplexing mode, and the uplink signal adopts the wavelength division multiplexing mode. Including: sequentially connected OLT (Optical Line Terminal), ODN (Optical Distribution Network) and n reflective ONUs (Optical Network Unit), among which:

[0033] The OLT includes: a seed light source module, a high-speed optical transmission module, a first wavelength division multiplexer (WDM), an optical circulator, an arrayed waveguide grating (AWG) and n optical receivers;

[0034]In the downlink direction, the seed light source module outputs seed light containing n wavelengths to the first WDM, and the high-speed optical transmission module outputs a high-speed time-division multiplexing downlink optical signal of a single wavelength to the first WDM, the The first WDM multiplexes the received seed light and the high-speed time-division multiplexed downlink optic...

Embodiment 2

[0050] In the hybrid passive optical network system of this embodiment, the downlink signal adopts the time division multiplexing mode, and the uplink signal adopts the wavelength division multiplexing mode. Including: OLT, ODN and n wavelength tunable ONUs, among which:

[0051] ●The OLT includes: a high-speed optical transmission module, a first WDM, an AWG, and n optical receivers; wherein:

[0052] In the downlink direction, the high-speed optical transmitting module outputs a high-speed time-division multiplexed downlink optical signal of a single wavelength to the first WDM, and the first WDM inputs the received high-speed time-division multiplexed downlink optical signal through the trunk optical fiber to the said ODN;

[0053] In the uplink direction, when the first WDM receives uplink optical signals of n wavelengths input by the trunk fiber, they are input to the AWG, and the AWG performs wavelength demultiplexing on the uplink optical signals, respectively input n...

Embodiment 3

[0063] Because in practical applications, some operators do not want to make any changes to the original optical distribution network when upgrading the WDM-PON system. In this case, the following methods can be used: Figure 4 In the system shown, the ONU uses a wavelength-tunable ONU, and the downlink light is directly split through the optical splitter, and the uplink signals of different wavelengths are combined by the optical splitter, and then incident into the trunk optical fiber for uplink transmission.

[0064] In this embodiment, the structures of the OLT and the ONU are the same as those in Embodiment 2. The difference from Embodiment 2 is that an optical splitter is used instead of the wavelength routing unit in Embodiment 2.

[0065] The ODN includes a trunk optical fiber, an optical splitter, and n branch optical fibers; in the downlink direction, the optical splitter receives a single-wavelength high-speed time-division multiplexed downlink optical signal output...

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Abstract

The invention discloses a passive optical network (PON) system as well as an optical line terminal (OLT) and a wavelength route unit in the PON, which has lower optical line terminal cost and is convenient to realize. The OLT comprises a seed light source module, a high speed optical transmitter module, a first wavelength division multiplex (WDM), an optical circulator (OC), an arrayed waveguide grating (AWG) and n-numbered optical receivers, wherein in the downlink direction, the seed light source module outputs a seed light containing n-numbered wavelengths to the first WDM; the high speed optical transmitter module outputs a high speed time division multiplex downlink optical signal of single wavelength to the first WDM; after carrying out wave combination on the seed light and the high speed time division multiplex downlink optical signal, and then the first WDM inputs the combined wave to the first port of the OC; the OC outputs the high speed time division multiplex downlink optical signal and the seed light through a second port; and in the uplink direction, after the OC receives a multi-wavelength uplink light signal through the second port, the light signal is output to the AWG through the third port of the OC; and wavelength demodulation multiplexing is carried out on the uplink light signal by the AWG, and then light signals with different wavelengths are input into the corresponding optical receiver.

Description

technical field [0001] The invention relates to the field of optical access network communication, in particular to a passive optical network system and an optical line terminal and a wavelength routing unit in the system. Background technique [0002] Passive Optical Network (PON) is a mainstream technology of the current FTTX solution (referring to a series of optical access technologies such as fiber-to-the-home, fiber-to-the-building, and fiber-to-the-curb). The current passive optical network is mainly based on time division multiplexing-passive optical network (Time Division Multiplexing-Passive Optical Network, TDM-PON). TDM-PON adopts a single wavelength for uplink and downlink, and the utilization rate of wavelength bandwidth is very low. With the continuous improvement of people's demand for bandwidth, this form of TDM-PON access network based on a single wavelength will inevitably encounter bottlenecks. [0003] Wavelength Division Multiplexing-Passive Optical N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04J14/02
CPCH04J14/0282H04J14/0232H04J14/0265H04J14/0246H04J14/025H04J2014/0253H04J14/0247
Inventor 苏婕何子安李长垒黄新刚李振刚
Owner ZTE CORP
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