Invention Grant
- Patent Title: Multilevel light intensity modulator
- Patent Title (中): 多级光强调制器
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Application No.: US12585618Application Date: 2009-09-18
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Publication No.: US07941011B2Publication Date: 2011-05-10
- Inventor: Masaharu Doi
- Applicant: Masaharu Doi
- Applicant Address: JP Kawasaki
- Assignee: Fujitsu Limited
- Current Assignee: Fujitsu Limited
- Current Assignee Address: JP Kawasaki
- Agency: Staas & Halsey LLP
- Main IPC: G02F1/01
- IPC: G02F1/01

Abstract:
In a multilevel light intensity modulator of the invention, input light is branched into n (n is an integer of 2 or more), and respectively sent to n branching waveguides. On the branching waveguides are respectively provided MZI light modulating sections. The MZI light modulating sections branch the input light into two at a branching ratio different from 0.5:0.5, and respectively output a binary optical signal with a quenching ratio being deteriorated, by on/off driving with a binary electric signal. Then by coupling the light output from the MZI light modulating sections, an optical signal with the light intensity modulated to a 2n value not including the zero level is output. As a result quaternary or higher level light intensity modulation which does not include the zero level, can be realized by a practical configuration using a binary electric signal.
Public/Granted literature
- US20100014801A1 Multilevel light intensity modulator Public/Granted day:2010-01-21
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