Principles, Optical Comb, Inc.

-	Principle of Optical Comb
-	Optical Frequency Measurement	Absolute Optical Frequency Counter by Optical Frequency Comb
		Optical Frequency Counter
-	Phase Lock System for Tera-Herts(THz) Synthesis

Principle of Optical Comb Image

Optical Frequency Comb Generator is an Electro-Optic (LiNbO3) modulator inside a Fabry-Perot cavity. It generates thousands of sidebands (discrete spectra) and a wide comb span (>6THz) modulated by microwave. An interval between sidebands is completely equal to a modulation frequency. All of components are passive and a center frequency is as same as a frequency of input stabilized laser. It fully Covers C-band of DWDM optical communications.

Modulation frequency 6.25GHz(bulk:800nm), 10GHz(waveguide), 25GHz(waveguide) as standard models are now on sale.


Absolute Optical Frequency counter by Optical Frequency Comb

Principle of Optical Frequency Counter
Optical Comb of f_m spacing is generated from the input stabilized laser of frequency f₀. The laser-under-test with frequency f_x generates beat signal of frequency f_b with the k-th order of the comb sideband. The frequency f_x is calculated by the equation f_x=f₀+k*f_m+ f_b.

Applications; Laser frequency stabilization, Phase locking for Tera-Hertz(THz) synthesis, Spectroscopy, Optical measurement, etc.

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[Absolute Optical Frequency Measurement by Optical Frequency Comb]

Optical Frequency Counter
We developed an absolute optical frequency measurement system by optical comb into all-in-one unit and released as a product, "Optical Frequency Counter". By introducing this device to your laboratory, you can apply optical frequency standard.

Example : Precise measurement for the output frequency of the light source

- Fluctuation of the output frequency of the light source can be observed in the form of microwave signal.
- MF-5802A shows the behavior of the light source, which cannot be observed by the conventional methods.

MF-5802A Interactive Catalog
with Animation !

Phase-Locked Tera-Hertz(THz)-frequency Synthesis Using Optical Frequency Comb Generator

Principle of Phase Locking
Optical Frequency Comb Generator(OFCG) is an absolute optical frequency grid because OFCG creates a broad comb of equally spaced frequencies and the comb has rigid phase differences.
Using this grid, difference frequency (ν_THz) between (ν₀) and (ν₁) is phased-locked to RF (f_m).
Therefore, it can obtain stable phase-locked Tera-Hertz(THz) frequency.

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[Phase-Locked Tera-Hertz(THz)-frequency Synthesis Using Optical Frequency Comb Generator]

[Experimental Result]