Depolarized laser diode module and depolarized laser diode light source
AssigneeFurukawa Electric Co., Ltd.
InventorsShunichi Matsushita, Shu Namiki, Yoshihiro Emori
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Abstract
The present invention provides the following designing method: in a laser diode module or a depolarized laser diode module which has one laser diode and one polarization maintaining fiber connected to the output side thereof, the length of the polarization maintaining fiber is a value obtained by calculation of equation 37 with use of a longitudinal mode spacing Δλoutput light from the Fabry Perot (FP) laser diode, an oscillating center wavelength λ0 of the laser light, a beat length LBeat 1 of the polarization maintaining fiber and an optical wavelength λBeat used in the measurement of the LBeat 1. (Equation 37) L Pig < λ 0 2 Δλ × L Beat 1 λ Beat 1
Claims86
A depolarized laser diode module comprising:
- a laser diode module having one laser diode and one polarization maintaining fiber which is connected to an output side of the laser diode and;
- a depolarizer connected to said laser diode module,
- wherein a length LPig of the polarization maintaining fiber is a value obtained by calculation of equation 1 with use of a longitudinal mode spacing Δλ of output light from the laser diode which is greater than zero, an oscillating center wavelength λ0 of the laser light which is greater than zero, a beat length LBeat 1 which is greater than zero of the polarization maintaining fiber which is greater than zero and an optical wavelength λBeat used in a measurement of the beat length LBeat 1.
- L
- Pig
- <
- λ
- 0
- 2
- Δλ
- ×
- L
- Beat
-
-
- 1
- λ
- Beat
-
-
- 1
- .
- (
- Equation
-
-
- 1
- )
A depolarized laser diode module comprising:
- a laser diode module having one laser diode and one polarization maintaining fiber which is connected to an output side of the laser diode and;
- a depolarizer connected to said laser diode module,
- wherein a length LDepo of the depolarizer is a value obtained by calculation of equation 4 with use of a longitudinal mode spacing Δλ of output light from the laser diode which is greater than zero, an oscillating center wavelength λ0 of the laser light which is greater than zero, a beat length LBeat 2 which is greater than zero of a birefringent material used in said depolarizer which is greater than zero and an optical wavelength λBeat 2 used in a measurement of the beat length LBeat 2.
- L
- Depo
- <
- λ
- 0
- 2
- Δλ
- ×
- L
- Beat
-
-
- 2
- λ
- Beat
-
-
- 2
- .
- (
- Equation
-
-
- 4
- )
Dependencies are inferred from the claim text.