Time filter

Source Type

Chino, CA, United States

Ye J.,Southwest Jiaotong University | Yan L.,Southwest Jiaotong University | Pan W.,Southwest Jiaotong University | Luo B.,Southwest Jiaotong University | And 3 more authors.
Optics Letters | Year: 2011

An all-fiber approach to generate triangular-shaped pulses based on frequency-to-time conversion is proposed and demonstrated. Two filter modules that have sinusoidal spectral responses are cascaded to create a triangular-shaped optical spectrum. Through the frequency-to-time conversion in a dispersive fiber, periodic triangular pulses with the same shape as the optical spectrum are obtained. The repetition rate and pulse width of the generated signals can be tuned by adjusting the modulation rate and the dispersion value, respectively. © 2011 Optical Society of America.

The disclosed technology in this patent document includes, among others, methods apparatus for distributed measuring at least one fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end.

Systems, devices and techniques for generating and analyzing states of polarization in light using multiple adjustable polarization rotators having different discrete polarization rotation states in various applications.

General Photonics Corporation and SUZHOU OPTORING TECHNOLOGY Co. | Date: 2014-06-02

Imaging devices and processing techniques based on imaging information along the depth direction in an optical coherent tomography (OCT) image are disclosed to enhance observed morphological features. The methods and systems obtain different OCT images of the target object under different reference path lengths, process the different OCT images to obtain a derivative with respect to the signal path length of image information of the different images, and processing the derivative to extract improved image information of the target object. The derivatives may be in a form related to a gradient value of the normalized OCT image intensity, or an attenuation coefficient.

Techniques and devices for measuring polarization crosstalk in birefringence optical media including polarization maintaining fiber.

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