Opnext Japan, Inc.

Cleitus Antony

Tomokazu Tanaka

Hiroo Matsue

Tadashi Hatano

Shigeru Tokita

Masazumi Noguchi

Tarou Tonoduka

Hideki Murakawa

An optical transmitter in which a microstripline is formed by a signal wiring pattern and a GND conductor pattern on a circuit board (including a flexible board), and a signal lead of a light emitting element module is mounted in a signal lead mounting hole connected with said signal wiring pattern so as to be connected with said signal wiring pattern, wherein a pattern adapted to add capacitance between a stem of said light emitting element module and said signal wiring pattern is provided on said signal wiring pattern on said circuit board, and wherein the pattern adapted to add capacitance has a size corresponding to &#xb1;50% of a capacitance C&#x2248;L/Zo, where Zo is signal line impedance, and L is the signal lead inductance.

Optical transmitter

Optical transmission equipment with more than one power supply which can, when turning on the power supplies, set predetermined function of a signal processing circuit after a predetermined time period after the last turn-on of the power supply and can enable the operation of a drive circuit of the light emitting device after an additional predetermined time period.

Optoelectronic transceiver with power voltage supply detection

The present invention provides an optical transmission module having a laser diode that generates laser beams and a differential type current switch provided with a first switch and a second switch in order to supply a modulating current to the laser diode. A terminal of the laser diode and the first switch are connected in series through a first transmission line and a first capacitor, the other terminal of the laser diode and the second switch are connected in series through a second transmission line and a second capacitor. The current driven by the second switch is terminated by a resistor connected to the first switch and the current driven by the first switch is terminated by a resistor connected to the second switch. Thus, the laser diode is modulated bidirectionally.

Optical transmission module

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Yokohama, Japan

Cleitus Antony