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Optical delay interferometer based on phase shifted fiber Bragg grating with optically controllable phase shifter.

Tae-Young Kim, Masanori Hanawa, Sun-Jong Kim

|June 12, 2009

Summary

We developed a new optical delay interferometer with a phase shifter controlled by light. This device uses fiber Bragg gratings and doped optical fibers for precise optical signal manipulation.

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Area of Science:

Optoelectronics
Fiber optics
Interferometry

Background:

Optical delay interferometers are crucial for various applications.
Controlling phase shifts optically offers advantages in precision and speed.
Existing methods may have limitations in tunability or complexity.

Purpose of the Study:

To propose and demonstrate a novel optical delay interferometer (ODI).
To incorporate an optically controllable phase shifter into the interferometer design.
To investigate the performance characteristics of the proposed ODI.

Main Methods:

Implementation using a phase-shifted fiber Bragg grating.
Incorporation of an Yb(3+)/Al(3+) co-doped optical fiber.
Optical phase control achieved by adjusting 976 nm laser diode pumping power.

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Main Results:

Linear control of the delayed optical signal's phase with pumping power.
Low polarization dependent loss of 0.044 dB.
Minimal polarization and temperature induced center wavelength shifts (6 pm and 9.8 pm/°C, respectively).

Conclusions:

The proposed ODI offers effective optically controlled phase shifting.
The device exhibits excellent stability and low signal degradation.
This novel interferometer is suitable for applications requiring precise optical phase control.