Optical module with a light receiving element receiving leakage light and method of monitoring optical module by receiving leakage light

Patent metadata

Field	Value
Publication number	US-9191122-B2
Application number	US-201314079884-A
Country	US
Kind code	B2
Filing date	Nov 14, 2013
Priority date	Jan 16, 2013
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

An optical module include a first substrate including a first surface over which a light emitting element is mounted, an optical waveguide provided with a second surface of the first substrate, a mirror configured to reflect output light of the light emitting element to the optical waveguide, a second substrate, and a light receiving element configured to receive leakage light produced when the output light from the light emitting element is transmitted through the mirror disposed in the optical waveguide, the light receiving element being mounted over the second substrate different from the first substrate.

First claim

What is claimed is:

1. An optical module, comprising:
a first substrate including a first surface over which a plurality of light emitting elements are mounted;
an optical waveguide provided with a second surface of the first substrate;
a mirror configured to reflect output light of the light emitting element to the optical waveguide;
a second substrate; and
a plurality of light receiving elements configured in an opposed manner to the plurality of light emitting elements to receive leakage light of the mirror through the first substrate and the optical waveguide, the light receiving elements being mounted over the second substrate.

2. The optical module according to claim 1 ,
the mirror further comprises at least one mirror corresponding to the plurality of the light emitting elements, and
a light receiving element of the plurality of light receiving elements has a light receiving diameter configured to receive the leakage light produced when output light from the plurality of the light emitting elements is transmitted through the at least one mirror disposed in the optical waveguide.

3. The optical module according to claim 2 , further comprising:
a processing unit configured to perform processing to correspondingly superpose individually different frequency components on the output light from the plurality of the light emitting elements; and
a detection unit configured to detect the frequency components from an electronic signal obtained by photoelectric conversion using the light receiving element.

4. The optical module according to claim 2 , further comprising:
a processing unit configured to cause the plurality of light emitting elements to output light in sequence at timing not overlapping; and
a detection unit configured to detect an electronic signal obtained by photoelectric conversion by the light receiving element.

5. A method of monitoring an optical module including a first substrate including a first surface over which a light emitting element is mounted, an optical waveguide provided with a second surface of the first substrate, a mirror configured to reflect output light of the light emitting element to the optical waveguide, the method comprising
receiving leakage light of the mirror through the first substrate and the optical waveguide produced when the output light from the light emitting element is transmitted through the mirror using a light receiving element provided with a second substrate provided with the second surface of the first substrate, the first substrate being different from the second substrate.

6. The method of monitoring an optical module according to claim 5 ,
wherein a plurality of the light emitting elements are disposed and the mirror comprises at least one mirror corresponding to the plurality of the light emitting elements,
the light receiving element has a light receiving diameter configured to receive the leakage light produced when output light from the plurality of the light emitting elements is transmitted through the at least one mirror,
different frequency components are individually superposed on output light of the plurality of light emitting elements, and
the light receiving element detects the frequency components from an electronic signal obtained by photoelectric conversion.

7. The method of monitoring an optical module according to claim 5 ,
wherein a plurality of the light emitting elements are disposed;
the light receiving element has a light receiving diameter configured to receive the leakage light produced when the output light from the plurality of the light emitting elements is transmitted through the at least one mirror;
the plurality of the light emitting elements output light in sequence at timing not overlapping; and
the light receiving element detects an electronic signal obtained by photoelectric conversion.

Assignees

• Fujitsu Ltd

Inventors

• Yagisawa Takatoshi
• Shiraishi Takashi

Classifications

• H04B10/60 Primary

  Receivers · CPC title

• H04B10/071

  using a reflected signal, e.g. using optical time domain reflectometers [OTDR] · CPC title

• G02B6/4214

  the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence) · CPC title

• G02B6/4286 Primary

  Optical modules with optical power monitoring · CPC title