National Institute of Information and Communications Technology, Incorporated

Keizo Inagaki

Tetsuya Kawanishi

Naokatsu Yamamoto

Atsushi Kanno

Toshimasa Umezawa

[Problem] To provide a camera with high sensitivity even if an output to the outside is weak. [Solution] This camera includes a light source, a demultiplexing unitwhich demultiplexes light from the light sourceinto first demultiplexed light and second demultiplexed light, a first modulatorwhich modulates the first demultiplexed light to obtain a modulated signal, an emission unitwhich emits the modulation signal modulated by the first modulator, and a phase imparting meanswhich imparts a plurality of types of phase shifts to the second demultiplexed light to obtain phase-imparted local light. The camera further includes a multiplexing unitwhich multiplexes light incident from the outside of the camera and the phase-imparted local light and obtains multiplexed light, a light receiving elementwhich detects the multiplexed light, and includes a light receiving unit, and an analysis processing unitwhich, on the basis of the multiplexed light received by the light receiving element, analyzes the position of a subject or the distance between the subject and the camera.

TOF camera

To provide a method and device capable of easily measuring the CMRR vs. frequency characteristics of an optical receiver. Light having a measurement frequency (&#x3c9; [hz]) is split into two different paths, and a first optical two-tone signal, which is signal light and has a frequency difference (&#x3c9;&#x2212;&#x394;&#x3c9; [hz]), and a second optical two-tone signal, which is local light and has a frequency difference (&#x3c9;+&#x394;&#x3c9; [hz]), are obtained and input into a coherent receiver to be measured, wherein electrical signals output from the receiver are measured to obtain both the ratio of the intensity of a signal component having the frequency &#x3c9;&#x2212;&#x394;&#x3c9; [hz] to the intensity of a signal component having the frequency &#x3c9; [hz], which corresponds to the CMRR on the signal light side, and the ratio of the intensity of a signal component having the frequency &#x3c9;+&#x394;&#x3c9; [hz] to the intensity of the signal component having the frequency &#x3c9; [hz], which corresponds to the CMRR on the local light side.

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Koganei, Japan

Keizo Inagaki