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We experimentally demonstrate an instantaneous frequency measurement system based on a 65 μm-long integrated Bragg grating filter. An amplitude comparison function based on its transmission and reflection responses allows identification of unknown RF frequencies above 30 GHz.
We demonstrate a novel scheme using a single dual-drive Mach-Zehnder modulator to generate versatile waveforms from a continuous light with a sinusoidal RF signal. A comprehensive mathematic model is derived and the algorithm to decide the variables for generating various waveforms is developed. The theoretical predictions agree with our experimental results. This reveals a new mechanism for arbitrary...
A novel spectral phase encoding scheme by using ±π/2 phase shift in the en/decoding is proposed. The scheme can submerge the code information in the encoded signals well, improving the security against code extraction from the encoded signals. Furthermore, based on the theoretical analysis, the coding performance of the proposed scheme is guaranteed.
We demonstrate a novel scheme using a single dual-drive Mach-Zehnder modulator to generate versatile waveforms from a continuous light with a sinusoidal RF signal. A comprehensive mathematic model is derived and the algorithm to decide the variables for generating various waveforms is developed. The theoretical predictions agree with our experimental results. This reveals a new mechanism for arbitrary...
In this paper we propose a scheme to compare any two encoded optical signals by using differential detection and identify optical code sequence in the encoded data stream. Furthermore, we propose an algorithm to recover the original data from the derived optical code sequence. This scheme can be used to analyze the security performance of multi-optical-code based secure optical communication systems...
We propose and demonstrate an all-optical modulation format conversion from RZ-DQPSK to RZ-OOK. We apply a supercontinuum based optical thresholder for the improvement of signal quality and allocation of two channels of DQPSK data in the two wavelengths. In the demonstration, we achieve error-free modulation format conversion after 50 km transmission at 10 Gbaud. 20 Gbit/s DQPSK data is split into...
We experimentally demonstrate an ultrafast optical pulse repetition rate multiplication technique based on reconfigurable time domain spectral amplitude/phase filtering operation provided by only a dispersive fiber and electro-optical modulator driven by a 40GHz pulse pattern generator, which can be programmed to control the repetition rate.
Multi-user, 10Gbps, optical code division multiple access (OCDMA) transmission over 59 km of standard single mode fiber without inline dispersion compensation is experimentally demonstrated for the first time.
In this paper, we analyzed the reflective properties of optical reflector based on circular coupled microring resonators using the transfer matrix method. The reflective spectrum changes greatly for different inter-resonator coupling due to constructive and destructive interference for different wavelength. Coupled resonator induced transparency occurred when all the resonators are weakly coupled...
Secure 16 ary OCDMA is experimentally demonstrated by encoding four serial bits at 2.49 Gbps into 16 optical codes via serial-to-parallel conversion and decoding by a multiport optical encoder/decoder.
Asynchronous OCDMA systems are demonstrated using 511 chip, 640 Gchip/s and 31 chip, 40 Gchip/s with different types of fiber Bragg grating encoders/decoders. Error-free transmission has been achieved with up to five OCDMA users.
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