Modulator-free quadrature amplitude modulation signal synthesis

Coherent synthesis of a complex modulated signal is achieved by simultaneously injection locking two directly-modulated semiconductor lasers. Better modulation linearity and comparable performance to LiNbO3 I-Q modulator is demonstrated.

[1]  Anthony E. Siegman,et al.  MODULATION AND DIRECT DEMODULATION OF COHERENT AND INCOHERENT LIGHT AT A MICROWAVE FREQUENCY , 1962 .

[2]  R. Lang,et al.  Injection locking properties of a semiconductor laser , 1982 .

[3]  Andrew J. Viterbi,et al.  Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission , 1983, IEEE Trans. Inf. Theory.

[4]  G. Jacobsen,et al.  Locking conditions and stability properties for a semiconductor laser with external light injection , 1985 .

[5]  Philippe Gallion,et al.  Locking bandwidth and relaxation oscillations of an injection-locked semiconductor laser , 1986 .

[6]  B. W. Hakki,et al.  Evaluation of transmission characteristics of chirped DFB lasers in dispersive optical fiber , 1992 .

[7]  S. Mohrdiek,et al.  Chirp reduction of directly modulated semiconductor lasers at 10 Gb/s by strong CW light injection , 1994 .

[8]  K. Kawashima,et al.  Cavity resonance shift and bandwidth enhancement in semiconductor lasers with strong light injection , 2003 .

[9]  S Chandrasekhar,et al.  A hybrid electroabsorption modulator device for generation of high spectral-efficiency optical modulation formats. , 2008, Optics express.

[10]  I. Morita,et al.  Coherent Optical 25.8-Gb/s OFDM Transmission Over 4160-km SSMF , 2008, Journal of Lightwave Technology.

[11]  Ming C. Wu,et al.  Strong optical injection-locked semiconductor lasers demonstrating > 100-GHz resonance frequencies and 80-GHz intrinsic bandwidths. , 2008, Optics express.

[12]  M. Seimetz.  High-Order Modulation for Optical Fiber Transmission , 2009 .

[13]  R. Noe,et al.  Hardware-Efficient Coherent Digital Receiver Concept With Feedforward Carrier Recovery for $M$ -QAM Constellations , 2009, Journal of Lightwave Technology.

[14]  S. Savory.  Digital Coherent Optical Receivers: Algorithms and Subsystems , 2010, IEEE Journal of Selected Topics in Quantum Electronics.

[15]  M. Magarini,et al.  Spectrally Efficient Long-Haul Optical Networking Using 112-Gb/s Polarization-Multiplexed 16-QAM , 2010, Journal of Lightwave Technology.

[16]  T. Sakamoto,et al.  16-level quadrature amplitude modulation by monolithic quad-parallel Mach-Zehnder optical modulator , 2010 .

[17]  David S. Wu,et al.  Direct Selection and Amplification of Individual Narrowly Spaced Optical Comb Modes Via Injection Locking: Design and Characterization , 2013, Journal of Lightwave Technology.

[18]  S. Chandrasekhar,et al.  Monolithic Silicon Photonic Integrated Circuits for Compact 100 $^{+}$Gb/s Coherent Optical Receivers and Transmitters , 2014, IEEE Journal of Selected Topics in Quantum Electronics.

[19]  Shiva Kumar,et al.  Fiber Optic Communications: Fundamentals and Applications , 2014 .

[20]  S. Chandrasekhar,et al.  Compact All-InP Laser-Vector-Modulator for Generation and Transmission of 100-Gb/s PDM-QPSK and 200-Gb/s PDM-16-QAM , 2014, Journal of Lightwave Technology.

[21]  P. Zakynthinos,et al.  Monolithic GaAs Electro-Optic IQ Modulator Demonstrated at 150 Gbit/s With 64QAM , 2014, Journal of Lightwave Technology.

[22]  G. Islan,et al.  Design and characterization , 2016 .