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Waveguide coupled photodiode using reflector and metal coplanar waveguide for optical triplexing applications.

Shih-Hsiang Hsu¹, Yung Chen, Hui-Zhi You

¹Department of Electronic Engineering, National Taiwan University of Science and Technology, No. 43, Sec. 4, Keelung Rd. Taipei, Taiwan, Republic of China. shsu@mail.ntust.edu.tw

|July 1, 2010

Summary

This study presents integrated InGaAs/InP photodetectors for optical triplexers, achieving high-speed monitoring at 1310, 1490, and 1550 nm wavelengths with error-free 10 Gbit/s operation.

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Area of Science:

Optoelectronics
Integrated Photonics
Semiconductor Devices

Background:

Optical triplexers are crucial for Wavelength Division Multiplexing (WDM) systems.
Monitoring photodiodes are essential components for optical communication systems.
Integration of photodetectors with optical waveguides enables compact and high-performance devices.

Purpose of the Study:

To propose and fabricate monolithically integrated InGaAs/InP photodetectors with AlGaAs/GaAs optical waveguides.
To demonstrate high-speed monitoring capabilities for optical triplexers operating at 1310, 1490, and 1550 nm.
To evaluate the performance of the integrated photodiode for high-speed data transmission.

Main Methods:

Fabrication of InGaAs/InP photodetectors monolithically integrated with AlGaAs/GaAs optical waveguides.

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Utilizing total internal reflection coupling for efficient light-to-detector coupling.

Employing metal coplanar waveguides on a polyimide layer for high-speed signal extraction.

Characterization of temporal response (Full Width Half Maximum) and 3-dB bandwidth.

Bit Error Rate (BER) testing at 10 Gbit/s using pseudo-random bit sequence (PRBS) data.

Main Results:

Demonstrated a temporal response Full Width Half Maximum (FWHM) of 29.5 ps.
Achieved a 3-dB bandwidth of 11 GHz for the integrated photodiode.
Exhibited error-free operation at 10 Gbit/s with a 2(7)-1 PRBS NRZ input data stream.
Successful monolithic integration of photodetectors and optical waveguides.

Conclusions:

The developed integrated photodiode is a key building block for optical triplexers.
The device exhibits excellent high-speed performance suitable for modern optical communication.
Monolithic integration offers a pathway to miniaturized and efficient optical monitoring solutions.