A Semiconductor Laser Integrated Surface Grating Active Filter

Abstract

The invention relates to a semiconductor laser with an integrated surface grating active filter, in which a segment of surface grating ridge waveguide active filter is monolithically integrated behind a traditional ridge waveguide distributed feedback Bragg grating (DFB) laser. Electrodes are arranged on the ridges of the DFB part to provide working current to the DFB part, so that it outputs a modulated optical signal meeting the wavelength requirements. The filter part also performs current injection through another independent electrode provided on the ridge, so as to provide gain to the filter for compensating the absorption loss generated when the modulated optical signal output by the DFB part passes through the filter part. The filter is formed by etching the irregular grating on the surface of the ridge waveguide, and its passband transmission spectrum and dispersion spectrum meet the function form and characteristics proposed by the present invention, so that the modulated optical signal output by the DFB laser can be effectively transmitted through the filter The noise outside the passband is filtered out, the signal extinction ratio is increased, and the dispersion pre-compensation is performed to increase the transmission distance of the output signal of the device of the invention in the optical fiber.

Description

technical field [0001] The invention belongs to the field of semiconductor lasers, in particular to a semiconductor laser with an integrated surface grating active filter. Background technique [0002] In the past few decades, the rapid development of the Internet and multimedia applications has resulted in a sharp increase in the requirements for communication bandwidth. Since the mid-1970s, the capacity-distance product has increased tenfold every four years. In optical fiber communication systems, the transmission of pulse signals in a medium with dispersion characteristics will cause waveform distortion and pulse width expansion, resulting in an increase in the receiving bit error rate. This problem has become increasingly prominent with the increasing demand for system capacity and the increase in signal transmission rate, and has become one of the main restrictive factors for the development of next-generation high-speed optical fiber communication systems. [0003] ...

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Problems solved by technology

However, the fiber Bragg grating with a uniform grating inevitably has side lobes outside the passband of the reflection spectrum, which affects the effect of filtering noise.

Apodized fiber grating ([5] Fr Hlich H G , et al., Optics Communications, 1998, 157(1-6):273-281.), can effectively suppress the reflection spectrum sidelobe and improve the noise filtering characteristics, but its The properties of the reflection spectrum are still limited by the established apodization function

On the other hand, the solutions reported above [1-5] all belong to the integration of other discrete components outside the semiconductor laser, so the final assembly volume is relatively large

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