Optical transmitter
AssigneeNEC Corporation
InventorYasubiro Aoki
Life of this patent
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Abstract
An optical transmitter includes a semiconductor laser which is supplied with a frequency modulated current. An emitted light from the semiconductor laser is modulated in intensity by an intensity modulator in accordance with an information signal and becomes a signal light pulse. The spectral width .DELTA..nu..sub.m of the light and a power P.sub.s of the signal light pulse meet the following formulas: ##EQU1## where P.sub.th is a threshold input light power when the stimulated Brillouin scattering begins to occur in the optical fiber in case of no frequency modulation of said light, .DELTA..nu..sub.B is the Brillouin gain bandwidth of the optical fiber, and .DELTA..nu..sub.s is the spectral width of the signal light in case of no frequency modulation of the light.
Claims3
An optical transmitter, comprising:
- means for emitting a light:
- means for supplying a current modulated in frequency to said emitting means to be thereby driven;
- means for modulating said light in intensity in accordance with an information signal to generate a signal light pulse;
- and
- means for supplying said signal light pulse to an optical fiber;
- wherein a spectral width .DELTA..nu..sub.m and a power P.sub.s of said signal light pulse meet the following formulas:
- ##EQU6## where P.sub.th is a threshold input light power when the stimulated Brillouin scattering begins to occur in said optical fiber in case of no frequency modulation of said light, .DELTA..nu..sub.B is the Brillouin gain bandwidth of said optical fiber, and .DELTA..nu..sub.s is the spectral width of said signal light in case of no frequency modulation of said light.
Dependencies are inferred from the claim text.