Method and device based on parabola phase modulation for producing optical frequency combs

Abstract

The invention discloses a method based on parabola phase modulation for producing optical frequency combs. The method comprises the following steps that (1) a single-frequency light beam produced by a continuous laser with a narrow linewidth passes through a polarization controller and then enters a phase modulator 3; the polarization controller enables light passing through the phase modulator to be in the same polarization direction; (2) an arbitrary waveform generator produces periodic electric signals, the electric signals are applied to the radio-frequency signal input end of the phase modulator after being amplified by an electric amplifier, namely, driving voltage signals applied to the phase modulator are in a parabola type, the frequency of each electric signal is equal to frequency intervals between the optical combs, and the parabolic width of the maximum periodic electric signal cannot exceed the modulation bandwidth of the phase modulator; (3) the light output by passing through the phase modulator is multi-frequency light. An output multi-frequency spectrum has symmetry all the time. A special laser light source different from conventional continuous wave frequency stabilized laser light is obtained.

Description

technical field [0001] The invention relates to the fields of optical communication, optical measurement and optical instrument manufacture, in particular to a method and device for generating an optical frequency comb based on parabolic phase modulation. Background technique [0002] An optical comb is a spectrum with a uniform distribution of frequencies that has many applications in optical communication and optical measurement. As the more advantageous wavelength division multiplexing (WDM) optical network and frequency division multiplexing (FDM) optical network in the next generation optical network, they usually need dozens of stable lasers as light sources to transmit signals, and these lasers can use a stable The optical frequency comb can be replaced by a flat optical frequency comb, which greatly reduces the cost of the system; the optical frequency comb can be used to obtain micron-level accuracy in the measurement of more than 100 meters; at the same time, the o...

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Problems solved by technology

Generally, there are three methods for generating an optical frequency comb: one is to use a mode-locked laser, but it is difficult to produce a stable mode lock in practice; the other is to use multiple sinusoidal signals to drive a phase modulator. This method is simple and easy to implement. However, multiple parameters need to be controlled at the same time, including multiple modulation frequencies, multiple phase differences, and multiple voltage amplitudes. This disadvantage is that the frequency interval of the optical comb cannot be changed flexibly, and because the electric amplifier has different responses to different frequencies. , will reduce the stability of the amplified electrical signal; finally, use the intensity modulator and the phase modulator in series, this method can also obtain a flat optical frequency comb, but the system is more complicated, the cost is high and there are many parameters to be controlled

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