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Submitted on: 31 October 2007.
Revised on: 22 February 2008.
Accepted on: 09 April 2008.
___________________IET Optoelectronics---WILEY
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Submitted on: 31 July 2002.
Revised on: 30 September 2002.
Accepted on: 16 October 2002.
___________________IET Optoelectronics---WILEY
Submitted on: 22 December 2002.
Revised on: 12 January 2003.
Accepted on: 25 January 2003.
___________________IET Optoelectronics---WILEY
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Submitted on: 10 September 2020.
Revised on: 13 December 2020.
Accepted on: 26 December 2020.
___________________IET Optoelectronics---WILEY