Waveguide optically pre-amplified detector with passband wavelength filtering

Abstract

The invention describes an integrated-photonics arrangement, implementable in a multi-guide vertical integration (MGVI) structure composed from III-V semiconductors and grown in one epitaxial growth run, allowing for the integration of semiconductor optical amplifier (SOA) and PIN photodetector (PIN) structures within a common wavelength-designated waveguide of the plurality of the vertically integrated wavelength-designated waveguides forming the MGVI structure. The integration includes a wavelength filter integrated between the SOA and PIN to reduce noise within the PIN arising from ASE generated by the SOA. In exemplary embodiments of the invention, the wavelength filter is integrated into MGVI structure either within a common wavelength designated waveguide or within the wavelength- designated waveguide. Further in other embodiments the wavelength filter is provided by a thin- film filter abutting a facet of the integrated-photonics arrangement wherein optical signals are coupled by optical waveguides and / or additional optical elements such as a multimode interference device.

Description

technical field [0001] The present invention relates to waveguide photonic devices and photonic integrated circuits, and more particularly to waveguide optical preamplified detectors in III-V semiconductor materials. Background technique [0002] The requirement for deep penetration of fiber into the access network is driving a parallel mass deployment of optical interface equipment for traffic to and from subscribers. For example, optical transceivers that receive downstream signals on one wavelength and transmit upstream signals on another wavelength (both wavelengths share the same fiber) must be deployed at each Optical Line Terminal (OLT) / Optical Network Unit (ONU). Therefore, cost-efficiency and batch scalability in manufacturing such components are increasingly becoming major issues. It is widely accepted in the telecommunications industry that optical access solutions will not become a commodity service until volume manufacturing of optical transceivers and other ma...

AI Technical Summary

Problems solved by technology

Second, in the ASE noise-limited case, i.e., when the aggregate gain becomes high, further increases in gain have no beneficial effect, since this causes Saturation of , as can be seen from equation (3)

Third, at least a portion of the ASE noise associated with spontaneous-spontaneous beats can be suppressed by inserting a wavelength filter between the amplification and detection sections of the OPAD section such that the passband of the filter is wide enough to allow passage of all signal wavelengths , but at the same time narrower than the spontaneous-spontaneous beat bandwidth

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