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Homodyne OFDM with optical injection locking for carrier recovery

Homodyne OFDM with optical injection locking for carrier recovery
Homodyne OFDM with optical injection locking for carrier recovery
Homodyne detection provides the simplest digital signal processing (DSP) solution to optical coherent detection and minimizes the receiver bandwidth requirements. These features make it promising for high spectrally-efficient formats such as Optical Orthogonal Frequency Domain Multiplexing (OFDM), which has a flat optical spectrum and which is thus inherently sensitive to high frequency distortions, e.g., due to limited detector bandwidth. The key to homodyne detection is recovery of the carrier from the received signal all optically (as opposed to frequency offset compensation via digital signal processing. Herein we use optical injection locking (OIL) in conjunction with carrier tone-assisted OFDM to achieve this. In contrast to previous reports, we show that OIL carrier recovery with subsequent homodyne detection can operate without the need for any optical pre-filtering. First, we evaluate the performance as a function of the carrier tone guardband bandwidth. Further, we improve the robustness of this technique using a slow phase lock loop that compensates for drift in the laser’s temperature/current control electronics. Using this improved setup, we compare our all-optical-carrier-recovered homodyne and the ‘traditional’ DSP-assisted intradyne detection for the case of OFDM-16QAM signals. Finally, we compare the computing complexity necessary for both approaches and estimate the intradyne performance limitations due to the carrier-local oscillator frequency offset
0733-8724
34-41
Liu, Zhixin
01f60f1d-54b7-4c19-b3f3-9550f9d77733
Kim, Joon-Young
1bc7ecfa-8ec3-4b25-bd56-4d98009defcb
Wu, David S.
073959ab-6a4c-49af-a3c0-18437706e72e
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Liu, Zhixin
01f60f1d-54b7-4c19-b3f3-9550f9d77733
Kim, Joon-Young
1bc7ecfa-8ec3-4b25-bd56-4d98009defcb
Wu, David S.
073959ab-6a4c-49af-a3c0-18437706e72e
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d

Liu, Zhixin, Kim, Joon-Young, Wu, David S., Richardson, David J. and Slavík, Radan (2015) Homodyne OFDM with optical injection locking for carrier recovery. IEEE Journal of Lightwave Technology, 33 (1), 34-41. (doi:10.1109/JLT.2014.2369994).

Record type: Article

Abstract

Homodyne detection provides the simplest digital signal processing (DSP) solution to optical coherent detection and minimizes the receiver bandwidth requirements. These features make it promising for high spectrally-efficient formats such as Optical Orthogonal Frequency Domain Multiplexing (OFDM), which has a flat optical spectrum and which is thus inherently sensitive to high frequency distortions, e.g., due to limited detector bandwidth. The key to homodyne detection is recovery of the carrier from the received signal all optically (as opposed to frequency offset compensation via digital signal processing. Herein we use optical injection locking (OIL) in conjunction with carrier tone-assisted OFDM to achieve this. In contrast to previous reports, we show that OIL carrier recovery with subsequent homodyne detection can operate without the need for any optical pre-filtering. First, we evaluate the performance as a function of the carrier tone guardband bandwidth. Further, we improve the robustness of this technique using a slow phase lock loop that compensates for drift in the laser’s temperature/current control electronics. Using this improved setup, we compare our all-optical-carrier-recovered homodyne and the ‘traditional’ DSP-assisted intradyne detection for the case of OFDM-16QAM signals. Finally, we compare the computing complexity necessary for both approaches and estimate the intradyne performance limitations due to the carrier-local oscillator frequency offset

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More information

Accepted/In Press date: 10 November 2014
Published date: 2015
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 374537
URI: https://eprints.soton.ac.uk/id/eprint/374537
ISSN: 0733-8724
PURE UUID: 692fb8a6-8d7f-4df9-b2c0-a5a61b2df453
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262

Catalogue record

Date deposited: 20 Feb 2015 11:39
Last modified: 20 Jul 2019 01:24

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