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Oscillator and high-frequency superposing module for driving laser diode

A technology of laser diodes and oscillators, used in power oscillators, lasers, laser parts and other directions

Inactive Publication Date: 2004-08-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the same problem occurs in applications that require fast response of oscillatory start / stop

Method used

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  • Oscillator and high-frequency superposing module for driving laser diode
  • Oscillator and high-frequency superposing module for driving laser diode
  • Oscillator and high-frequency superposing module for driving laser diode

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Embodiment Construction

[0021] figure 1 is a circuit diagram of a high frequency superposition module 1 for driving a laser diode LD according to the first preferred embodiment of the present invention. figure 1 , a noise suppression filter circuit 4 including a capacitor C8 and an inductor L2 is provided between the power supply terminal LDA and the laser diode LD. The laser diode LD has an anode terminal Tda and a cathode terminal Tdc connected to the ground terminal GND. The high frequency superposition module 1 has a terminal To for outputting a driving signal and a ground terminal Tg. In order to operate the high-frequency superposition module 1, the terminals To and Tg are connected to the terminals Tda and Tdc, respectively. If the high-frequency superposition module 1 is not connected, the laser diode LD is only driven by the DC current provided by the power supply terminal LDA.

[0022] The high frequency superposition module 1 also has a power input terminal VCC and a ground terminal G...

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PUM

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Abstract

An oscillator includes a transistor, a first bias resistor connected between the base of the transistor and a power input terminal, and a second bias resistor connected between the base of the transistor and a control-voltage input terminal. When the control-voltage input terminal is grounded, the bias voltage at the base of the transistor is below a predetermined threshold, thus causing the oscillator to stop oscillation. When the control-voltage input terminal is open, the bias voltage at the base of the transistor is above the threshold, thus causing the oscillator to start oscillation.

Description

technical field [0001] The invention relates to an oscillator for generating high-frequency signals, and to a high-frequency superposition module, which includes the oscillator for driving laser diodes. Background technique [0002] Laser diode driving circuit is one of various applications of high frequency oscillation circuit. In a conventional laser diode driving circuit, the laser diode is driven in a multi-channel manner in which a high-frequency current is superimposed on the driving direct current (DC) current, thereby preventing damage caused by an increase in the temperature of the laser diode. Generation of mode hopping noise. In order to superimpose a high-frequency current on a DC current, an oscillation circuit that generates a high-frequency signal is used, for example, as disclosed in Japanese Unexamined Patent Application Publication No. 7-93758. [0003] Figure 8 is a circuit diagram of a laser diode driving circuit disclosed in Japanese Unexamined Patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/125H01S5/042H03B5/06H03B5/12H03B5/18
CPCH03B5/1281H03B5/1203H03B5/1231H03B2200/0094H03B1/00H03B2200/0096H03B2200/0008
Inventor 佐藤芳郎饭田和浩田村诚道
Owner MURATA MFG CO LTD