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Receiver and method of receiving a multichannel optical signal

A receiver and signal technology, applied in the field of optical communication systems, can solve problems such as the limitation of transmission distance between regenerations and the increase of channel crosstalk, and achieve the effect of improving the system's capabilities

Inactive Publication Date: 2010-01-06
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, crosstalk between channels increases and transmission distance between regenerations is limited

Method used

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  • Receiver and method of receiving a multichannel optical signal
  • Receiver and method of receiving a multichannel optical signal
  • Receiver and method of receiving a multichannel optical signal

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Embodiment approach

[0074] Figure 13 A method for fine-tuning the modulation depth of an optical information signal using receiver-side information according to an embodiment of the present invention is described. The method begins at step 250 in which an optical carrier is modulated at the optical transmitter 200 with the data signal 214 . Next, at step 252 , the resulting optical information signal 24 is transmitted within the WDM signal 26 to the optical receiver 202 .

[0075] Proceeding to step 254 , the data signal 214 is recovered at the optical receiver 204 . In step 256, the FEC decoder 224 determines the bit error rate of the data based on the overhead in SONET. At step 258 , the bit error rate is reported by the controller 226 of the optical receiver 202 to the controller 216 of the optical transmitter 200 through the OSC 230 .

[0076] Next, at decision step 260, controller 216 determines whether the modulation is optimal. In one embodiment, modulation is optimized when the bit e...

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Abstract

A method and system for transmitting information in a wavelength division multiplex (WDM) or other suitable multichannel optical communication system includes receiving a multichannel signal having a symbol rate and comprising a plurality of non-intensity modulated optical information signals. The non-intensity modulated optical information signals have a minimum channel spacing comprising a multiple of the symbol rate within 0.4 to 0.6 of an integer. The non-intensity modulated optical information signals are separated from the multichannel signal and each converted into an intensity modulated optical information signal using an asymmetric interferometer. A data signal is recovered from the intensity modulated optical information signal.

Description

technical field [0001] The present invention relates generally to optical communication systems, and more particularly to receivers and methods for multi-channel optical communication systems. Background technique [0002] Telecommunication systems, cable TV systems, and data communication networks use fiber optic networks to quickly transfer large amounts of information between remote locations. In a fiber optic network, information is transmitted through optical fibers in the form of optical signals. Optical fibers are thin strands of glass fibers capable of transmitting signals over long distances with low loss. [0003] Fiber optic networks often use wavelength division multiplexing (WDM) to increase transmission capacity. In a WDM network, multiple optical channels at different wavelengths are transmitted in each fiber. Network transmission capacity increases as a multiple of the number of wavelengths or channels within each fiber. [0004] The maximum distance a si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/158H04L27/22H04B10/02H04B10/04H04B10/06H04B10/08H04B10/142H04B10/152H04J14/00
CPCH04B10/69H04B10/0779H04J14/02H04B10/67H04J14/0305
Inventor T·霍施达
Owner FUJITSU LTD