Optical communication module, manufacturing method thereof and wavelength selective filter
Granted: April 17, 2003
Application Number:
20030072542
The incident angle of the beam with regard to an etalon is arranged finely tunable by either rotating the etalon provided with a plane of incidence inclined with regard to the rotational axis thereof in the vicinity of the optical axis or rotating a lens whose edge surface is obliquely ground around the optical axis, which allows the incident angle of the laser beam with regard to the etalon to be adjusted and fixed with high precision.
Optical transmission module
Granted: April 3, 2003
Application Number:
20030063873
A semiconductor laser and an optical fiber are optically coupled via a first lens and a second lens, the second lens is previously fixed to a module package and these parts are mounted to the module package, when focal lengths of the first lens and the second lens are respectively designated by f1 and f2, an optical distance between a principal plane of the first lens on its side of the second lens and a principal plane of the second lens on its side of the first lens, is made…
Optical wavelength stabilization circuit, optical transmitter and optical transmission system
Granted: September 26, 2002
Application Number:
20020136249
In the initial state, any wavelength variation of the output signal light with a change of the current injected into the laser is monitored with a wavelength meter, the quantity of wavelength variation is fed back to the wavelength compensation circuit, a compensation voltage for maintaining the wavelength in the initial stage is figured out, and that voltage is recorded into a memory element or the like. A configuration to add this compensation voltage to a comparator makes it possible…
Optical transmitter having temperature compensating function and optical transmission system
Granted: September 12, 2002
Application Number:
20020126360
An optical transmitter comprises a modulator for generating a modulated current in accordance with a modulation control signal, a light emitting element driven by the modulated current from the modulator to emit light in accordance with the modulated current, a first current source for supplying the modulator with a driving current, a first temperature detector for detecting an operating temperature of the modulator to output a signal indicative of a detected operating temperature of the…
