In the experiment, 40 Gb/s DPSK signal was demodulated successfully, and the extinction of the demodulated signal is 14.5 dB. With the help of temperature control, the experimental results have a long-time stability and can be switched between constructive interference and destructive one.
In the paper, we developed a new measurement method for the on-off time of high speed microwave switch. Envelop signal through switch is measured using a sampling oscilloscope with 70 GHz bandwidth by this method. Then this signal is demodulated by correspondent test software which is developed by us.
Special attention is paid to the specific receiver functions necessary to demodulate the received signal.
It can both amplify the light power and demodulate the wavelength signal.
Its output power is 1000 times as high as traditional broadband light source (BBS) and it can demodulate the signal by scanning wavelength in 30 nm of bandwidth range in the situation of 1550 nm central wavelength.
This paper presents a convenient formulation for the discussion of experiments that are designed to modulate particle beams, such as an electron beam, and to demodulate this beam at optical frequencies.
The algorithm uses a square wave to demodulate phase and moving averages and comb-shaped filters to extract the phase information from low frequency.
But this paper presents a new technique of multiple beam modulation to transmit data and azimuth information, so that the receiver with only an antenna can perform communication and direction-finding from demodulating signals.
According to this characteristic, through demodulating the Δλ, the value of the cable tension can be determined.
The problem of demodulating across argument and literal boundaries
Theoretical analysis and experimental results are presented to demonstrate that this method is capable of demodulating the interferogram and thus permits a direct inspection of the depth-resolved image.
This is used to estimate the optimum choice of the demodulating frequency which considerably influences the measurement of the instantaneous amplitude and phase of the underlying process.
Based on experimentally revealed dependences of demodulated pulse parameters (propagation velocity, amplitude, and duration) on the static pressure and on the amplitude of the primary pulses, an equation of state for this medium is proposed.
The signal modulation is demodulated by the lock-in amplification.
The received signal is multiplied by the Inverse Discrete Fourier Transform (IDFT) result of the mirror image code of the prototype spreading code, and then demodulated by Orthogonal Frequency-Division Multiplexing (OFDM) demodulator.
Similar to other algorithms, the proposed scheme also can be demodulated with or without channel estimates at the receiver, but the performance degrades approximately by 3dB when estimates are not available.
So, quotient of both demodulated characteristics makes it possible to localize the disturbance.