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Submitted on: 20 January 2010.
Revised on: 15 March 2010.
Accepted on: 05 May 2010.
___________________IEEE PHOTONICS TECHNOLOGY LETTERS
Submitted on: 02 September 2021.
Revised on: 12 December 2021.
Accepted on: 09 February 2022.
___________________IEEE PHOTONICS TECHNOLOGY LETTERS