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Optical homodyne coherent receiver and method for receiving a multichannel optical signal

An optical receiver and multi-channel technology, applied in the field of receivers, can solve problems such as difficult recovery of optical spectrum

Active Publication Date: 2014-08-20
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in analog electronics, only real signals can be manipulated, therefore, it is not easy to recover the entire optical spectrum

Method used

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  • Optical homodyne coherent receiver and method for receiving a multichannel optical signal
  • Optical homodyne coherent receiver and method for receiving a multichannel optical signal
  • Optical homodyne coherent receiver and method for receiving a multichannel optical signal

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Embodiment Construction

[0022] figure 2 According to an embodiment of the present solution, an example of receiving an example multi-channel optical signal OB is shown Optical homodyne receiver 200 . The optical receiver 200 is preferably a coherent receiver. The optical receiver 200 is preferably a polarization diversity receiver.

[0023] as in figure 2 As can be seen in , the exemplary received optical signal OB includes a main optical carrier signal at frequency fLO and a plurality of optical channels (e.g., first optical channel A, second optical channel B, third optical channel C, third optical channel Four optical channels D), each channel comprising a set of information carried by eg optical subcarriers fLO-f2, fLO-f1, fLO+f1, fLO+f2, respectively. Each subcarrier has preferably been modulated with a signal comprising said information set. The modulating signal may be, for example, an electrical RF signal. As is well known to those skilled in the art, the multi-channel optical sign...

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Abstract

This disclosure relates to an optical receiver arrangement (500) and a method for receiving a multichannel optical signal OB in an optical receiver arrangement (500), wherein the optical signal OB comprises a number of optical channels A, B, C, D equally distributed around an optical carrier frequency fLO and wherein the optical receiver arrangement (500) comprises an optical homodyne receiver (200) and a multichannel recovery unit (300). The method comprises the actions of: receiving and detecting the multichannel optical signal OB so as to provide at least one electrical quadrature signal IQV comprising at least one folded channel A+D, wherein each folded channel A+D correspond to a set of two optical channels A, D collapsed onto each other; and up converting said at least one electrical quadrature signal IQV so as to provide at least one up converted quadrature signal IQV-UP comprising at least one pair of two separated unfolded channels A, D, wherein each pair correspond to the two optical channels A, D of an unique folded channel A+D; and demodulating said at least one up converted quadrature signal IQV-UP so as to provide one baseband quadrature signal IQA, IQD for each un folded channel A, D such that each baseband quadrature signal IQA, IQD corresponds to one unique optical channel A, D.

Description

technical field [0001] The present disclosure relates to fiber optic communications, and in particular, to methods for receiving optical multi-channel signals and receivers for performing the methods. Background technique [0002] Today, high-capacity communications via optical fibers are commonly used, and optical networks using optical fibers have become widely used since they are suitable for handling rapidly increasing communications for various multimedia services or similar services requiring high bandwidth. In conclusion, it is fair to say that there is growing interest in the transmission of large amounts of information with high spectral efficiency in the optical domain. [0003] Today's optical transmission systems therefore use advanced modulation formats such as Quadrature Phase Shift Keying (QPSK) and 16-Quadrature Amplitude Modulation (16-QAM) and similar formats. Here, the information is carried in the amplitude and phase of the light field rather than in the...

Claims

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Application Information

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IPC IPC(8): H04B10/61H04B10/63
CPCH04B10/613H04B10/616H04B10/63
Inventor B-E.奥尔森
Owner TELEFON AB LM ERICSSON (PUBL)
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