Digital Coherence Enhancement Enabling 6-GBd DP-64QAM Using a 1.4-MHz Linewidth Laser

作者：Lavery Domanic^*; Maher Robert; Paskov Milen; Thomsen Benn C; Bayvel Polina; Savory Seb J

来源：IEEE Photonics Technology Letters, 2013, 25(22): 2213-2216.

DOI：10.1109/LPT.2013.2283744

• Coherent receivers
• quadrature amplitude modulation (QAM)
• laser linewidth
• optical communications

This letter demonstrates the possibility of using digital coherence enhancement-a means of estimating and digitally compensating local oscillator laser phase noise using a secondary, low speed coherent receiver-to enable the reception of high order quadrature amplitude modulation (QAM) using a monolithically integrated tunable semiconductor laser as local oscillator. We show that this coherence enhancement technique compensates both the Lorentzian and non-Lorentzian distributed phase noise of this laser, enabling reception of DP-64QAM without differential decoding, and with a record (linewidth) x(symbol duration) product of 2.3 x 10(-4).

• 出版日期2013-11-15