Planar lightwave circuit(plc) device, wavelength tunable light source comprising the same device and wavelength division multiplexing-passive optical network(wdm-pon) using the same light source

Abstract

In the manufacture and application of a PLC-ECL type wavelength tunable light source, provided is a wavelength tunable mechanism with improved performance and stability, a light source with improved packaging performance and mass productivity, and a light source applied to a WDM-PON with initialization and stabilization functions. The wavelength tunable light source having a PLC(planar lightwave circuit)-ECL(external cavity laser) structure includes a first housing in which a semiconductor optical gain medium is mounted, a second housing in which a PLC device is mounted, and a third housing in which an optical fiber is mounted. The first, second, and third housings make an optical axis alignment through an optical coupling lens and combinded in a laser welding method.

Description

technical field [0001] The present invention relates to optical communication, more specifically, to a planar lightwave circuit (PLC, planar lightwave circuit) device using thermo-optic effect, a wavelength tunable light source including the device and an optical transmitter (optical transmitter), and a wave using the optical transmitter Division multiplexed passive optical network (WDM-PON). This invention is based on the research carried out as part of the IT New Growth Drive Core Technology Development Project of the Ministry of Information and Communications (Project Management No. 2005-S-401-02), project name: High Speed ​​Passive Optical Network Technology Development (High Speed ​​Passive Optical Network Technology Development) Yuanguang network technology development)). Background technique [0002] Research and development related to the passive optical network (PON) based on wavelength division multiplexing (WDM) that provides voice, data and, in the next The bro...

AI Technical Summary

Problems solved by technology

[0022] First, since the optical coupling among the RSOA 150, the three-dimensional optical waveguide core layer 101, and the auxiliary optical fiber 160 is butt coupling without using a lens, the optical coupling efficiency will be reduced to 1 / 3 of its maximum value compared with the case of using a lens. 2

In addition, considering the alignment error (1-2μm) of flip-chip bonding and V-groove, the optical coupling efficiency is further reduced

[0023] Second, since various components constituting a wavelength-tunable light source are mounted on a single substrate, it is impossible to selectively combine each functional part with their best components

Also, when the performance of a part of the finally assembled light source (such as the optical coupling efficiency between the RSOA and the PLC device) is low, the performance of the entire light source is degraded making it difficult to ensure performance quality and productivity

[0024] Third, since the different components constituting the wavelength tunable light source are mounted on a single substrate, not only the overall productivity is low but also repair and recovery are impossible when problems occur during the process

However, this method is only applied to RSOA or injection-locked based FP-LDs employing locking or reflective mechanisms

In addition, the original function cannot be added wavelength tunable light source with self-oscillation function

Images