News Column

Researchers Submit Patent Application, "Optical Module and Method of Monitoring Optical Module", for Approval

August 7, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors YAGISAWA, Takatoshi (Kawasaki, JP); SHIRAISHI, Takashi (Isehara, JP), filed on November 14, 2013, was made available online on July 24, 2014.

The patent's assignee is Fujitsu Limited.

News editors obtained the following quote from the background information supplied by the inventors: "Japanese Laid-open Patent Publication No. 2011-141478 has disclosed a structure of a multi-channel optical transmitter in which a signal light condensed by a lens is branched, and is monitored by a monitoring PD for each channel.

"However, in the technique in Japanese Laid-open Patent Publication No. 2011-141478, a light emitting element and a light receiving element are provided with a same substrate, and thus the output wire lines of the light receiving element have to be provided with that substrate. In this case, the thickness of an optical transmitter increases, and the device becomes large in size."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "According to an aspect of the embodiment, 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.

"The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims.

"It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed.

BRIEF DESCRIPTION OF DRAWINGS

"FIG. 1 is an outer perspective view of an optical module according to a first embodiment;

"FIG. 2A is a top view of the optical module, and FIG. 2B is a sectional view taken on line IIB-IIB in FIG. 2A;

"FIG. 3 is a diagram illustrating flows of an electronic signal and an optical signal;

"FIG. 4A is a top view of an optical module according to a comparative example, and FIG. 4B is a sectional view taken on line IVB-IVB in FIG. 4A;

"FIG. 5A is a top view of an optical module according to a second embodiment, and FIG. 5B is a sectional view taken on line VB-VB in FIG. 5A;

"FIG. 6 is a diagram illustrating flows of an electronic signal and an optical signal;

"FIG. 7 is an example of a flowchart executed by a control unit at the time of monitoring an optical signal;

"FIG. 8 is an example of a flowchart executed by a control unit at the time of monitoring an optical signal; and

"FIG. 9 is a block diagram for explaining a hardware configuration when the control unit is configured by a processing unit that executes a program."

For additional information on this patent application, see: YAGISAWA, Takatoshi; SHIRAISHI, Takashi. Optical Module and Method of Monitoring Optical Module. Filed November 14, 2013 and posted July 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=2814&p=57&f=G&l=50&d=PG01&S1=20140717.PD.&OS=PD/20140717&RS=PD/20140717

Keywords for this news article include: Fujitsu Limited.

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Source: Politics & Government Week


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