National Institute of Advanced Industrial Science and Technology

Guangwei Cong

Kazuhiro Ikeda

Hitoshi Kawashima

Shu Namiki

Ken Tanizawa

Hiroyuki Matsuura

Haruhiko Kuwatsuka

Keijiro Suzuki

Satoshi Suda

Provided is a driving device for PWM control of voltage pulses for controlling the temperature of a heater in a phase controller, the driving device being capable of increasing the response speed of an optical element such as an optical switch. Phase controllers include first and second heaters for changing the temperatures of first and second optical waveguides extending in parallel. Driving devices include pulse generation circuits that generate voltage pulses to apply to the first and second heaters. To start raising the temperature of the second heater, the pulse generation circuit generates a first voltage pulse and consecutive second voltage pulses to apply to the second heater with zero voltage pulse being applied to the first heater, the first voltage pulse having a long pulse width and the second voltage pulses following the first voltage pulse and having a shorter pulse width than the first voltage pulse.

Driving device and driving method for phase controller, and optical switch

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Tsukuba, Japan

Guangwei Cong