Analysis of OSNR requirements  for higher modulation schemes for various local  oscillator powers

Amaresh Kumar Sahu

doi:10.1117/12.2182809

15 June 2015 Analysis of OSNR requirements for higher modulation schemes for various local oscillator powers

Amaresh Kumar Sahu

Proceedings Volume 9654, International Conference on Optics and Photonics 2015; 96542B (2015) https://doi.org/10.1117/12.2182809
Event: International Conference on Optics and Photonics 2015, 2015, Kolkata, India

Abstract

To meet the growing demands of data traffic in long haul communication, it is necessary to efficiently use the low-loss region(C-band) of the optical spectrum, by increasing the no. of optical channels and increasing the bit rate on each channel .But narrow pulses occupy higher spectral bandwidth. To circumvent this problem, higher order modulation schemes such as QPSK and QAM can be used to modulate the bits, which increases the spectral efficiency without demanding any extra spectral bandwidth. On the receiver side, to meet a satisfy, a given BER, the received optical signal requires to have minimum OSNR. In our study in this paper, we analyses for different modulation schemes, the OSNR required with and without preamplifier. The theoretical limit of OSNR requirement for a modulation scheme is compared for a given link length by varying the local oscillator (LO) power. Our analysis shows that as we increase the local oscillator (LO) power, the OSNR requirement decreases for a given BER. Also a combination of preamplifier and local oscillator (LO) gives the OSNR closest to theoretical limit.

Citation Download Citation

Amaresh Kumar Sahu "Analysis of OSNR requirements for higher modulation schemes for various local oscillator powers", Proc. SPIE 9654, International Conference on Optics and Photonics 2015, 96542B (15 June 2015); https://doi.org/10.1117/12.2182809

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KEYWORDS

Modulation

Oscillators

Signal to noise ratio

Digital signal processing

Polarization

Receivers

Signal detection

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