Optical Transmitter
AssigneeNippon Telegraph and Telephone Corporation
InventorsJosuke Ozaki, Yoshihiro Ogiso, Mitsuteru Ishikawa
Life of this patent
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Abstract
An optical transmitter includes: an optical modulator; a driver integrated circuit (driver IC) that supplies a modulation electrical signal for the optical modulator; a first wiring board mounted face down by flip-chip mounting to connect the optical modulator and the driver IC; a first Peltier device configured to control a temperature of the optical modulator; and a second Peltier device configured to control a temperature of the driver IC.
Claims8
An optical transmitter comprising:
- an optical modulator;
- a driver integrated circuit (driver IC) that supplies a modulation electrical signal for the optical modulator;
- a first wiring board mounted face down by flip-chip mounting to connect the optical modulator and the driver IC;
- a first Peltier device configured to control a temperature of the optical modulator;
- and
- a second Peltier device configured to control a temperature of the driver IC.
The optical transmitter according to claim 6, wherein the chip of the optical modulator and the driver IC are mounted in a package with a form of a high-bandwidth coherent driver modulator, HB-CDM,
- an electrode pad with a differential signal interface is formed in an electrical signal path of an input portion of the package, the driver IC, and the chip of the optical modulator, and
- a difference in height between an upper surface of an RF terrace on which a radio frequency (RF) electrode pad of the input unit is formed and an upper surface of the driver IC is 100 μm or less, the RF electrode pad of the RF terrace and the electrode pad of the driver IC are connected via a second wiring board, and an inclination of a bottom surface of the second wiring board relative to an upper surface of the driver IC and an upper surface of the RF electrode pad in a height direction is within ±3°.
Dependencies are inferred from the claim text.