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We present a method to achieve vector modulation in an electroabsorption modulator with help of a directly modulated laser. We discuss the challenges involved and demonstrate the combined phase and amplitude modulation theoretically and experimentally using a commercial electroabsorption modulator integrated laser.
We investigate the feasibility of an electroabsorption modulator integrated laser as a digital coherent transmitter. The laser and EAM sections are used as phase and amplitude modulators respectively. We discuss the challenges involved and demonstrate the combined phase and amplitude modulation on a commercial device.
Broadband frequency-chirped multi-cycle terahertz wave (THz) pulses have been generated from periodically poled lithium niobates (PPLNs). Up- and down-chirped THz pulses with temporal frequency shifts from 1 to 1.7 THz and 2 to 1 THz, respectively, were measured. In the waveforms of the both chirped THz pulses, large fluctuation of THz electric field amplitude was observed. Since the fluctuation disturbs...
We demonstrate that our recently proposed chirp measurement technique can be applied to the measurement and visualization of the small-signal dynamic chirp characteristics of modulators in vector space for the first time. Both discrete modulators and those integrated in externally modulated laser modules can be characterized by this method. The results agree with existing method to the first order...
We propose an extinction-ratio and chirp tunable modulator in single-drive operation. Using the modulator, we demonstrated precise amplitude modulation without parasitic phase modulation. Extinction-ratio was larger than 52.2 dB, with low chirp (<|0.007|) operation.
We propose a novel method to measure chirp of an electro-absorption modulator at any frequency using optical homodyne quadrature demodulation technique. Chirp parameters are directly obtained in the small-signal vector space, enabling practical chirp assessment for advanced modulation optical transmission.
A method is proposed for measuring total chirp of integrated parallel Mach-Zehnder-type modulators by analyzing optical spectrum components. It can be applied to characterize the integrated modulators with finite extinction ratio and permit to evaluate the chirp parameter at a specific frequency. An experiment measurement is then conducted to demonstrate the proposed method for an optical FSK modulator...
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