Abstract:
A wavelength reference device for tuning a tunable Fabry-Perot filter and/or a tunable VCSEL to a desired frequency, where the device uses a Michelson interferometer (110), comprising a beam splitter (120) and detector (140), t o generate a series of reference frequencies.
Abstract:
A wavelength reference device (110) for tuning a tunable Fabry-Perot filter and/or a tunable VCSEL (105) to a desired frequency, where the device uses a Fizeau interferometer (125) and a position sensitive detector (130), with th e position sensitive detector (130) being used to measure the location of the maximum reflected power from the interferometer (125), whereby to determine the wavelength of laser radiation for tuning the device (110).
Abstract:
An optical fiber wavelength reference device (110) for tuning a tunable Fabr y- Perot filter (105) and/or a tunable VCSEL (105) to a desired frequency, wher e the device uses a fiber etalon (120) to generate a pattern of reference frequencies against which the device is tuned. In addition, the device uses a detector (125) to monitor the output of the Fiber Etalon (120). The ouput of the detector (125) is inputed to a controller (115) used to control the VCSE L (105) or tunable Fabrey-Perot filter (105).
Abstract:
A compact wavelength monitoring and control assembly (110) for a narrow band (i.e., laser) source is provided, comprising two narrow bandpass, wavelength selective transmission filter elements (130, 160) of Fabry-Perot structure through which two separate collimated beams from a laser source are directed onto two photodetectors (145, 175). A control circuit processes the simultaneously acquired signals from the two detectors (145, 175) as the las er wavelength is varied. The device functions as an optical wavelength discriminator in which the detectors (145, 175) convert optical energy to current (or voltage) for a feedback loop for controlling the laser source. A ny one of a large number of discrete, predetermined wavelengths may be chosen f or locking using the same device.
Abstract:
A compact wavelength monitoring and control assembly (10) for a narrow band (i.e., laser) source (12) is provided comprising a narrow bandpass, waveleng th selective transmission filter element (18), of Fabry-Perot etalon structure (18), through which two collimated beams from a laser source (12) are direct ed onto two closely spaced photodetectors (22, 20). For wavelength stabilizatio n, the differential output of the two photodetectors (22, 20) is used in a feedback loop (28) to stabilize the wavelength of the laser source (12) to t he desired wavelength. Through the dependence of the wavelength transmission of the Fabry-Perot etalon (18) on angle and physical parameters (i.e., refracti ve index and thickness), a wavelength variation of the source (12) is converted into a transmission loss, which is different for the two photodetectors (22, 20), so that the wavelength change is detected by changes in the signals output from the two detectors (22, 20).
Abstract:
An optical fiber wavelength reference device (110) for tuning a tunable Fabry-Perot filter (105) and/or a tunable VCSEL (105) to a desired frequency, where the device uses a fiber etalon (120) to generate a pattern of reference frequencies against which the device is tuned. In addition, the device uses a detector (125) to monitor the output of the Fiber Etalon (120). The ouput of the detector (125) is inputed to a controller (115) used to control the VCSEL (105) or tunable Fabrey-Perot filter (105).
Abstract:
A wavelength reference device for tuning a tunable Fabry-Perot filter and/or a tunable VCSEL to a desired frequency, where the device uses a Michelson interferometer (110), comprising a beam splitter (120) and detector (140), to generate a series of reference frequencies.
Abstract:
A compact wavelength monitoring and control assembly (110) for a narrow band (i.e., laser) source is provided, comprising two narrow bandpass, wavelength selective transmission filter elements (130, 160) of Fabry-Perot structure through which two separate collimated beams from a laser source are directed onto two photodetectors (145, 175). A control circuit processes the simultaneously acquired signals from the two detectors (145, 175) as the laser wavelength is varied. The device functions as an optical wavelength discriminator in which the detectors (145, 175) convert optical energy to current (or voltage) for a feedback loop for controlling the laser source. Any one of a large number of discrete, predetermined wavelengths may be chosen for locking using the same device.
Abstract:
An optical fiber wavelength reference device (110) for tuning a tunable Fabry-Perot filter (105) and/or a tunable VCSEL (105) to a desired frequency, where the device uses a fiber etalon (120) to generate a pattern of reference frequencies against which the device is tuned. In addition, the device uses a detector (125) to monitor the output of the Fiber Etalon (120). The ouput of the detector (125) is inputed to a controller (115) used to control the VCSEL (105) or tunable Fabrey-Perot filter (105).