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A transceiver for an optical network unit of a twdm‑pon system

A TWDM-PON, optical network unit technology, applied in wavelength division multiplexing systems, transmission systems, electromagnetic transceivers, etc., can solve the problems of limited power budget, high nonlinear crosstalk, ONU wavelength rogue characteristics, etc. Cost, fast wavelength tuning, effect of improving transmission range

Active Publication Date: 2017-09-01
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If both components need to be tuned, the ONU cost of TWDM-PON will increase significantly
[0007] 2) In TWDM-PON, due to the limitation of the output power of the transmitter and the sensitivity of the receiver, the power budget of the downlink and uplink is quite limited
[0008] 3) Another key problem in the TWDM-PON system is the rogue characteristic of the ONU wavelength
However, this will introduce high non-linear crosstalk or make the ODN an active system

Method used

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  • A transceiver for an optical network unit of a twdm‑pon system
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  • A transceiver for an optical network unit of a twdm‑pon system

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Embodiment Construction

[0030] figure 1 A schematic diagram of an adjustable ONU transceiver according to an embodiment of the present invention is shown. This adjustable ONU transceiver 1 includes an optical coupler 10, a bidirectional amplifier 11 (such as SOA), a comb filter 12, two optical circulators (the first optical circulator 13 and the second optical circulator 14), a light source 15 And downlink receiver 16. Preferably, FP-LD or RSOA can be used as the light source. In one embodiment of the invention, the optocouplers are arranged 80:20. It should be understood that in practice, the above ratios can be changed to other values ​​(eg 90:10 etc.) depending on the parameters in the construction.

[0031] In this scheme, the tunable ONU transmitter and receiver are interrelated by sharing the same bidirectional amplifier 11 and comb filter 12, and thus greatly saves the cost of the ONU. The uplink wavelength is generated through a feedback loop, which includes an optical coupler 10 , a bidi...

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Abstract

The invention provides an optical network unit transceiver for a TWDM-PON (Time and Wavelength Division Multiplexed Passive Optical Network) system. The transceiver comprises an optical coupler, a comb filter coupled with the optical coupler, a first optical circulator coupled with the comb filter, an downlink receiver coupled with the first optical circulator, a second optical circulator coupled with the optical coupler and the first optical circulator respectively, and an optical source configured to modulate uplink data into uplink optical signals and output the uplink optical signals.

Description

technical field [0001] The present invention relates to a passive optical network (PON), and more particularly, to a transceiver for an optical network unit of a TWDM-PON system. Background technique [0002] Time and Wavelength Division Multiplexed Passive Optical Network (TWDM-PON) has recently been selected by the Full Service Access Network (FSAN) and the International Telecommunication Union Standardization Sector (ITU-T) Q2 Group As the main architecture of the next generation passive optical network (NGPON2). Compared with other candidate solutions such as OFDM-PON and pure WDM-PON, TWDM-PON technology is more interesting due to its increased system capacity, flexible bandwidth allocation, higher efficiency. TWDM-PON is also compatible with existing optical distribution network (ODN) and can be easily migrated from XGPON. [0003] In TWDM-PON, multiple wavelength pairs are stacked together to increase capacity. For example, 40Gb / s TWDM-PON includes four pairs of wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/40H04B10/572
Inventor 高震森
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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