Abstract:
There is provided a light receiving device including a polarization dispersing section that disperses a polarization direction of incoming light into a plurality of polarization directions, a light collecting section that has a metal pattern shaped like concentric circles on a surface thereof, where the light collecting section collects light that has passed through the polarization dispersing section, and a light receiving section that receives the light collected by the light collecting section. Also provided are a light receiving device manufacturing method and a light receiving method. The light collecting section may have a surface plasmon antenna that has the metal pattern shaped like the concentric circles on a surface thereof, and the light receiving section may receive the light collected toward a center of the concentric circles of the metal pattern of the light collecting section, through a hole at the center of the concentric circles, on a rear side of the light collecting section.
Abstract:
A temperature stabilizer for accurately stabilizing the temperature of an object is provided. The temperature stabilizer stabilizes the temperature of an object to a reference temperature. The temperature stabilizer includes an oscillator provided in proximity to the object, for generating an oscillation signal having a frequency corresponding to an inputted frequency control signal, a phase detector for detecting the phase difference between a feedback signal based on the oscillation signal and a reference clock signal having a predetermined frequency, a loop filter for generating the frequency control signal to synchronize the feedback signal with the reference clock signal based on the output from the phase detector, a comparator for comparing the value of the frequency control signal with a reference value determined corresponding to the reference temperature and an electric heating converter for heating or cooling the object based on the comparison result from the comparator.
Abstract:
Provided is a test apparatus that tests a device under test including an optical coupler transmitting optical signals in a direction perpendicular to a device surface. The test apparatus includes a substrate on which the device under test is to be loaded, an optical transmission path that transmits the optical signals, and a lens section facing the optical coupler on the substrate that focuses the optical signals from an end of either the optical coupler or the optical transmission path to an end of the other.
Abstract:
[PROBLEM] Providing an optical source that outputs optical frequency modulated light having a constant output optical intensity.[MEANS FOR SOLVING THE PROBLEM] Provided is a light source apparatus that outputs an optical signal having an optical frequency corresponding to a frequency control signal, the light source apparatus including a laser light source section that outputs laser light having an optical frequency corresponding to the frequency control signal; and an optical intensity adjusting section that compensates for intensity change of the laser light to output laser light in which the intensity change caused by a change in the optical frequency is restricted. The optical intensity adjusting section includes an optical amplification section that adjusts an amplification factor of the laser light from the laser light source section, based on the frequency control signal, to restrict the intensity change of laser light corresponding to the frequency control signal, and outputs the resulting laser light.
Abstract:
To efficiently apply jitter to an optical signal using a simple configuration, provided is an optical signal generating apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising a light source section that outputs laser light having an optical frequency corresponding to a frequency control signal, an optical modulation section that modulates an optical signal output by the light source section, according to a designated pulse pattern, and an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal.
Abstract:
In a fiber laser, a stable laser oscillation is easily realized. A fiber laser includes an optical amplification unit which has a first end and a second end, receives pump light, and emits spontaneous emission light from the first end, and receives the spontaneous emission light at the second end, and emits stimulated emission light from the first end, and a light passing unit (PM fibers, single mode fiber) which connects the first end and the second end with each other, and passes the spontaneous emission light and the stimulated emission light, where the light passing unit includes the PM fibers (polarization plane maintaining units) which present a small change in the polarization plane of passing light and a single mode fiber (polarization plane changing unit) which presents a large change in the polarization plane of passing light.
Abstract:
A laser oscillator includes a ring resonator. The ring resonator includes an optical circulator having first, second, third, and fourth ports and a first optical amplification fiber connected to the optical circulator. Light incident on the first port is exited from the second port, and light incident on the second port is exited from the third port. The fourth port provides an exciting light and injects the exciting light into the ring resonator through the first port. The first optical amplification fiber amplifies light exited from the third port with the exciting light provided by the fourth port. The laser oscillator also includes an optical member connected to the optical circulator. The optical member reflects at least a part of the light exited from the second port and injects the same into the second port again.
Abstract:
Provided are: an RF signal generator 110 which generates and outputs an RF signal having a signal waveform in which the potential of the signal changes to be alternately positive and negative with respect to a reference potential; a semiconductor laser 140 which receives, at its one end, a drive current which is based on the signal output from the RF signal generator 110; and a rectifier 150 which receives the drive current at its one end which has a polar directivity opposite to that of the one end of the semiconductor laser 140, with the other end of the semiconductor laser 140 and the other end of the rectifier 150 connected to a common potential.
Abstract:
There is provided a test apparatus for testing a device under test, including a test signal generator that generates a test signal to test the device under test, an electric-photo converter that converts the test signal into an optical test signal, an optical interface that (i) transmits the optical test signal generated by the electric-photo converter to an optical receiver of the device under test and (ii) receives and outputs an optical response signal output from the device under test, a photo-electric converter that converts the optical response signal output from the optical interface into an electrical response signal and transmits the electrical response signal, and a signal receiver that receives the response signal transmitted from the photo-electric converter and a test method.
Abstract:
To efficiently apply jitter to an optical signal using a simple configuration, provided is an optical signal output apparatus that outputs an optical pulse pattern signal including jitter, the optical signal generating apparatus comprising a light source section that outputs an optical signal having an optical frequency corresponding to a frequency control signal; an optical modulation section that modulates the optical signal output by the light source section, according to a designated pulse pattern; and an optical jitter generating section that delays an optical signal passed by the optical modulation section according to the optical frequency, to apply jitter to the optical signal.