Tunable optical source and optical module

Patent metadata

Field	Value
Publication number	US-10509166-B2
Application number	US-201816048753-A
Country	US
Kind code	B2
Filing date	Jul 30, 2018
Priority date	Aug 3, 2017
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

A tunable optical source includes a substrate, a light source disposed on the substrate, and a wavelength selecting element configured to select light of a specific wavelength as output light, from light emitted from the light source, in accordance with a control signal. On the substrate, a wavelength filter including multiple output ports and a photodetector are disposed. The wavelength filter is configured to receive a part of the output light and to output light beams to the respective output ports. The photodetector is configured to receive the light beam output from one of the output ports. The tunable optical source further includes an inspection waveguide connecting to the photodetector at one end, and an inspection light input unit for inputting inspection light provided at the other end of the inspection waveguide.

First claim

What is claimed is:

1. A tunable optical source comprising:
a substrate;
a light source disposed on the substrate;
a wavelength selecting element configured to select light of a specific wavelength as output light, from light emitted from the light source, in accordance with a control signal;
a wavelength filter including a plurality of output ports, the wavelength filter being disposed on the substrate and being configured to receive a part of the output light and to output light beams to the respective output ports;
a photodetector disposed on the substrate so as to receive the light beam output from one of the plurality of output ports;
an inspection waveguide connecting to the photodetector at one end; and
an inspection light input unit for inputting inspection light, the inspection light input unit being provided at another end of the inspection waveguide.

2. A tunable optical source comprising:
a substrate;
a light source disposed on the substrate;
a wavelength selecting element configured to select light of a specific wavelength as output light, from light emitted from the light source, in accordance with a control signal;
a wavelength filter including a plurality of output ports, the wavelength filter being disposed on the substrate and being configured to receive a part of the output light and to output light beams to the respective output ports;
a photodetector disposed on the substrate so as to receive the light beam output from one of the plurality of output ports;
an inspection waveguide connecting to the photodetector at one end;
an inspection light input unit for inputting inspection light, the inspection light input unit being provided at another end of the inspection waveguide; and
a control part configured to generate the control signal and to output the control signal to the wavelength selecting element, the control signal being generated based on an inspection signal obtained from the photodetector, and the wavelength selecting element being controlled by the control signal such that a wavelength of the output light becomes equal to a target wavelength.

3. The tunable optical source according to claim 2 , further including
a photodetector for optical output power,
an optical output power inspection waveguide connecting to the photodetector for optical output power at one end, and
an optical output power inspection light input unit provided at another end of the optical output power inspection waveguide.

4. The tunable optical source according to claim 3 , further including a splitter configured to split the inspection light into a plurality of inspection beams and to output the inspection beams to the inspection waveguide and the optical output power inspection waveguide.

5. The tunable optical source according to claim 3 , further including
a same number of photodetectors as a number of the output ports, each of the photodetectors being disposed so as to face one of the output ports, and
a splitter configured to split the inspection light into a plurality of inspection beams and to output the inspection beams to the respective photodetectors.

6. The tunable optical source according to claim 3 , wherein at least one of the inspection light input unit and the optical output power inspection light input unit is disposed at an end surface of the substrate.

7. The tunable optical source according to claim 3 , further including a grating coupler configured to receive light emitted from above the substrate and to output the received light to the inspection waveguide and the optical output power inspection waveguide.

8. An optical module comprising:
a tunable optical source; and
an optical modulator configured to modulate output light received from the tunable optical source and to output the modulated output light,
the tunable optical source including
a substrate;
a light source disposed on the substrate;
a wavelength selecting element configured to select light of a specific wavelength as output light, from light emitted from the light source, in accordance with a control signal;

a wavelength filter including a plurality of output ports, the wavelength filter being disposed on the substrate and being configured to receive a part of the output light and to output light beams to the respective output ports;
a photodetector disposed on the substrate so as to receive the light beam output from one of the plurality of output ports;
an inspection waveguide connecting to the photodetector at one end;
an inspection light input unit for inputting inspection light, the inspection light input unit being provided at another end of the inspection waveguide; and
a control part configured to generate the control signal and to output the control signal to the wavelength selecting element, the control signal being generated based on an inspection signal obtained from the photodetector, and the wavelength selecting element being controlled by the control signal such that a wavelength of the output light becomes equal to a target wavelength.

Assignees

• Fujitsu Optical Components Ltd

Inventors

• Sugiyama Masaki

Classifications

• H01S5/142

  which comprises an additional resonator · CPC title

• G02B2006/12142

  Modulator · CPC title

• G02B6/12007 Primary

  forming wavelength selective elements, e.g. multiplexer, demultiplexer · CPC title

• H01S5/0608

  controlled by light, e.g. optical switch · CPC title

• H01S5/0612

  controlled by temperature · CPC title