Optical Modules and Optical Transmitters

Abstract

Optical modules and optical transmitters. An optical module comprising: a waveguide substrate, comprising a light waveguide and multiple electrodes that apply an electrical signal to the optical waveguide; Relay substrate, arranged adjacent to the waveguide substrate; The terminal substrate, adjacent to the waveguide substrate and arranged oppositely from the relay substrate across the waveguide substrate; Carrier substrate, the waveguide substrate, the relay substrate, the terminal substrate is mounted on the carrier substrate. The plurality of electrodes having a first interconnect unit from the relay substrate via the waveguide substrate to the terminal substrate and a plurality of second interconnect units branching from the first interconnecting unit and on the terminal substrate. In the second interconnect unit, the first interconnect branch comprises a capacitor and a termination resistor; The second interconnect branch is connected via a bias resistor to the interconnect portion of the carrier substrate, passing under the waveguide substrate, to the DC electrode for bias adjustment on the relay substrate.

Description

technical field [0001] Embodiments discussed herein relate to optical modules and optical transmitters used in optical transmission. Background technique [0002] For example using electro-optic crystal substrates such as LiNbO 3 (LN) substrate and LiTaO 2 substrates) or semiconductor substrates (such as GaAs substrates and InP substrates) are considered to be optical modules. This optical waveguide device is formed by forming a metal film made of titanium (Ti) on a part of a substrate and thermally diffusing the film, or by performing proton exchange in benzoic acid after a patterning process. Electrodes are then formed near the optical waveguide to construct an optical module, such as an optical modulator. [0003] When driving such an optical modulator at high speed, it is assumed that the terminal of the signal electrode is connected to the terminal of the ground electrode via a resistor to form a traveling wave electrode, and a high-speed microwave signal (electrical...

AI Technical Summary

Problems solved by technology

This causes the problem that the size of the relay substrate (e.g. along the length of the parallel waveguides of the Mach-Zehnder modulator unit) increases and the size of the module housing the Mach-Zehnder modulator unit also increases

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