Low noise optical multi-carrier generation using optical-FIR filter for ASE noise suppression in re-circulating frequency shifter loop.

In this paper, an improved multi-carrier generation scheme based on single-side-band recirculating frequency shifter with optical finite impulse response (FIR) filter for amplified spontaneous emission (ASE) noise suppression is proposed and experimentally demonstrated. The carrier-to-noise-ratio (CNR) instead of tone-to-noise-ratio (TNR) is introduced to more reasonably and exactly evaluate the signal-to-noise-ratio of a multi-carrier source with non-flat noise floor. We have experimentally attain the worst case CNR of 22.5dB and 19.1dB for generated 50 and 69 flat low noise carriers, which has shown significant improvement than the previous cited works based on recirculating frequency shifter.

[1]  B Zhu,et al.  1.12-Tb/s 32-QAM-OFDM superchannel with 8.6-b/s/Hz intrachannel spectral efficiency and space-division multiplexed transmission with 60-b/s/Hz aggregate spectral efficiency. , 2011, Optics express.

[2]  Bo Huang,et al.  Generation of coherent and frequency-lock multi-carriers using cascaded phase modulators and recirculating frequency shifter for Tb/s optical communication. , 2011, Optics express.

[3]  M. A. Mirza,et al.  Multiwavelength Operation of Erbium-Doped Fiber Lasers by Periodic Filtering and Phase Modulation , 2009, Journal of Lightwave Technology.

[4]  Nan Chi,et al.  Stable Optical Frequency-Locked Multicarriers Generation by Double Recirculating Frequency Shifter Loops for Tb/s Communication , 2012, Journal of Lightwave Technology.

[5]  P. Petropoulos,et al.  Single-laser 32.5 Tbit/s Nyquist-WDM , 2012, 2012 International Conference on Photonics in Switching (PS).

[6]  Lixia Xi,et al.  Generation of 50 Stable Frequency-Locked Optical Carriers for Tb/s Multicarrier Optical Transmission Using a Recirculating Frequency Shifter , 2011, Journal of Lightwave Technology.

[7]  Feng Tian,et al.  Experiment of 2.56-Tb/s, polarization division multiplexing return-to-zero 16-ary quadrature amplitude modulation, 25 GHz grid coherent optical wavelength division multiplexing, 800 km transmission based on optical comb in standard single-mode fiber , 2013 .

[8]  B. Nebendahl,et al.  Single-laser 32.5 Tbit/s Nyquist WDM transmission , 2012, IEEE/OSA Journal of Optical Communications and Networking.

[9]  B. Zhu,et al.  Transmission of a 1.2-Tb/s 24-carrier no-guard-interval coherent OFDM superchannel over 7200-km of ultra-large-area fiber , 2009, 2009 35th European Conference on Optical Communication.

[10]  Xiaoping Zheng,et al.  Generation of broadband optical frequency comb with rectangular envelope using cascaded intensity and dual-parallel modulators , 2014 .

[11]  W. Shieh,et al.  1-Tb/s single-channel coherent optical OFDM transmission over 600-km SSMF fiber with subwavelength bandwidth access. , 2009, Optics express.

[12]  Changyuan Yu,et al.  Complementary frequency shifter based on polarization modulator used for generation of a high-quality frequency-locked multicarrier. , 2014, Optics letters.

[13]  Lixia Xi,et al.  Theoretical and experimental study on generation of stable and high-quality multi-carrier source based on re-circulating frequency shifter used for Tb/s optical transmission. , 2011, Optics express.

[14]  P. Poggiolini,et al.  On the Performance of Nyquist-WDM Terabit Superchannels Based on PM-BPSK, PM-QPSK, PM-8QAM or PM-16QAM Subcarriers , 2011, Journal of Lightwave Technology.

[15]  Jianjun Yu,et al.  Flattened comb generation using only phase modulators driven by fundamental frequency sinusoidal sources with small frequency offset. , 2013, Optics letters.

[16]  Jianjun Yu,et al.  Theoretical and Experimental Study on Improved Frequency-Locked Multicarrier Generation by Using Recirculating Loop Based on Multifrequency Shifting Single-Sideband Modulation , 2012, IEEE Photonics Journal.

[17]  N. K. Fontaine,et al.  Spectrally-sliced coherent receivers for THz bandwidth optical communications , 2012, 2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel.

[18]  Zhaohui Li,et al.  Frequency-locked multicarrier generator based on a complementary frequency shifter with double recirculating frequency-shifting loops. , 2013, Optics letters.