Intermode beat frequency and line-width stabilization of a 1 mm long self mode-locked frequency comb quantum dash laser emitting at 1535 nm by external all-fiber based single-cavity optical self-injection time-delay control is presented. Self-injection optical delay tuning is conducted by piezo-crystal single-mode fiber stretching. An intermode beat frequency control by 2 MHz and an intermode beat frequency line width reduction from 67 kHz to approximately 900 Hz is achieved. The experimental results are confirmed by an independent free-space stabilization experiment and stochastic time-domain modeling.
In this paper, simple methods to obtain phase shifts and an amplitude regulation using electro-optical technique, with
purpose to drive antenna array systems, are presented. This solution comprises true-time delay properties of the optics
fiber, driven by tuneable lasers. In the following overview, several techniques proposed by different authors are presented.
All methods are based on the same idea, which consists on setting the radiofrequency (RF) signal phase and amplitude
in the optical domain instead of using radiofrequency techniques. Trough the electro-optical conversion the RF
signal is transferred onto an optical carrier, where it can be influenced to achieve the desired result.
In this paper, various noninterferometric measurement schemes for determination of single-mode optical fiber nonlinear
coefficient are reviewed, studied and discussed. All of proposed measurement techniques use one of the Kerr-related
phenomena, which are self-phase modulation, modulation instability, cross-phase modulation or four-wave mixing.
Some of the methods applied to determine the nonlinear coefficient are based on pulsed lasers instead of continuous
wave sources. The brief description of each measurement scheme and method is given. This paper focuses on the comparison
of different noninterferometric measurement schemes in terms of their construction set-up simplicity, equipment
cost, measurement time and field usage. In many of the measurement techniques, presented in this paper, the accurate
determination of the input power becomes a critical factor to reduce the measurement uncertainty. Versatility of testing
the various types and lengths of fibers is also an important issue in the design of optical devices and systems.
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