Submitted on: 05 March 2010.
Revised on: 24 June 2010.
Accepted on: 24 July 2010.
___________________Frontiers of Optoelectronics---HIGHER EDUCATION PRESS
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Submitted on: 27 August 2016.
Revised on: 06 December 2016.
Accepted on: 01 February 2017.
___________________Frontiers of Optoelectronics---HIGHER EDUCATION PRESS
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Submitted on: 26 April 2010.
Revised on: 19 August 2010.
Accepted on: 05 September 2010.
___________________Frontiers of Optoelectronics---HIGHER EDUCATION PRESS
Submitted on: 11 January 2014.
Revised on: 08 February 2014.
Accepted on: 24 February 2014.
___________________Frontiers of Optoelectronics---HIGHER EDUCATION PRESS