Abstract: A method for testing an optical chip, while the optical chip is still on a wafer, utilizing an optical probe, includes the steps of creating an access point on the wafer adjacent the optical chip. The optical chip having a waveguide having an axis. A portion of the waveguide is removed to form the access point such that light exiting the planar optical waveguide is directed in a direction substantially different from the axis of the waveguide. An optical probe is placed along a propagation path of the exiting light to optically couple the optical probe and optical chip.

Abstract: A method for testing an optical chip, while the optical chip is still on a wafer, utilizing an optical probe, includes the steps of creating an access point on the wafer adjacent the optical chip. Inserting a probe at the access point to optically couple the optical probe and optical chip. The optical probe includes at least a first optical waveguide for changing the direction of input light at the probe to optically couple with the optical chip at the access point.

Abstract: A low-noise optical fiber amplifier for performing a long-distance optical transmission in a wavelength division multiplexing optical transmission apparatus is provided. This amplifier includes a first optical fiber amplifier having a pre-stage optical fiber, and a first coupler for supplying pump light to the pre-stage optical fiber; a dispersion compensating Raman amplifier (DCRA) connected to the first optical fiber amplifier and having a dispersion compensating optical fiber (DCF) that compensates for the dispersion accumulated in an optical line and generates a Raman gain, and a second coupler for supplying Raman pump light onto the DCF; and a second optical fiber amplifier connected to the DCRA, and including a post-stage optical fiber and a third coupler for supplying pump light onto the post-stage optical fiber. Accordingly, this optical fiber amplifier is used for terrestrial WDM optical transmission, and thus has remarkably low noise figure compared to the existing optical amplifiers.

Abstract: An apparatus and source arrangement for filtering an electromagnetic radiation can be provided which may include at least one spectral separating arrangement configured to physically separate one or more components of the electromagnetic radiation based on a frequency of the electromagnetic radiation. The apparatus and source arrangement may also have at least one continuously rotating optical arrangement which is configured to receive at least one signal that is associated with the one or more components. Further, the apparatus and source arrangement can include at least one beam selecting arrangement configured to receive the signal.

Abstract: An external gain system includes a gain source, a laser coupler, one or more mode converters, a high index contrast waveguide, and a filter structure fabricated on either high or low index contrast waveguides. The filter structure defines the external cavity with the front facet of the laser diode. An external cavity laser is further integrated with one or more functional blocks to perform a specific function. A multiplexer is integrated with the external cavity laser array, where the waveguide ends of the external cavity serve as an input to the multiplexer, to form an integrated WDM transmitter. The output of the transmitter, if fabricated on high index contrast waveguide, is then coupled to a low index waveguide or fiber matched waveguide by using a mode converter. The gain system can be configured to become a linear optical amplifier and can also be configured as a low cost wavelength converter.

Abstract: A method for testing an optical chip, while the optical chip is still on a wafer, utilizing an optical probe, includes the steps of creating an access point on the wafer adjacent the optical chip. Inserting a probe at the access point to optically couple the optical probe and optical chip. The optical probe includes at least a first optical waveguide for changing the direction of input light at the probe to optically couple with the optical chip at the access point.

Abstract: A method for testing an optical chip, while the optical chip is still on a wafer, utilizing an optical probe, includes the steps of creating an access point on the wafer adjacent the optical chip. The optical chip having a waveguide having an axis. A portion of the waveguide is removed to form the access point such that light exiting the planar optical waveguide is directed in a direction substantially different from the axis of the waveguide. An optical probe is placed along a propagation path of the exiting light to optically couple the optical probe and optical chip.

Abstract: A low-noise optical fiber amplifier for performing a long-distance optical transmission in a wavelength division multiplexing optical transmission apparatus is provided. This amplifier includes a first optical fiber amplifier having a pre-stage optical fiber, and a first coupler for supplying pump light to the pre-stage optical fiber; a dispersion compensating Raman amplifier (DCRA) connected to the first optical fiber amplifier and having a dispersion compensating optical fiber (DCF) that compensates for the dispersion accumulated in an optical line and generates a Raman gain, and a second coupler for supplying Raman pump light onto the DCF; and a second optical fiber amplifier connected to the DCRA, and including a post-stage optical fiber and a third coupler for supplying pump light onto the post-stage optical fiber. Accordingly, this optical fiber amplifier is used for terrestrial WDM optical transmission, and thus has remarkably low noise figure compared to the existing optical amplifiers.

Abstract: Disclosed is a Brillouin erbium-fiber laser system producing multiwavelengths with a dual spacing of 10 GHz and 20 GHz. The Brillouin erbium-fiber laser system includes: a Sagnac reflector generating even- and odd-order Strokes waves by launching input lights, a first unit forming a first resonator with the Sagnac reflector, wherein the first unit is coupled to a first directional coupler in the Sagnac reflector, a second unit forming a second resonator with the Sagnac reflector, wherein the second unit is coupled to the first directional coupler in the Sagnac reflector, and a third unit for inputting Brillouin pump light into one of first and the second units, whereby the optical fiber laser system outputs multiwavelengths with a dual spacing.

Abstract: The invention relates to a hybrid fiber amplifier in which a dispersion compensating Raman amplifier is associated with an erbium doped fiber amplifier to enhance the amplifier efficiency. It is an object of the invention to provide a dispersion compensating Raman amplifier(DCRA) by inducing Raman pump light into a dispersion compensating fiber to obtain a Raman gain in which a depolarizer is used to eliminate the pump light polarization dependent Raman gain, and a hybrid fiber amplifier in which the DCRA is associated with an erbium doped fiber amplifier(EDFA) to enhance the efficiency.

Abstract: The present invention discloses an apparatus for suppressing stimulated Brillouin scattering and the method thereof that a threshold fiber input power is raised in order to prevent loss of an inputted light by stimulated Brillouin scattering being generated in a case that a signal having a strong intensity is inputted to the optical fiber and so a light signal having more strong intensity can be inputted to the optical fiber. The apparatus for suppressing the SBS includes a plurality of first transmission unit, each of which has a wavelength separation, for transmitting information signals through a signal channel; and a second transmission unit for generating and transmitting a supervisory signal of which a modulation frequency and an intensity generates a phase modulation to the plurality of information signals, through a supervisory channel.

Abstract: An optical fiber laser is disclosed capable of generating an ultrashort pulse which has intensive energy and is stable against polarization by using a sagnac loop mirror and a Faraday rotator mirror, which includes a light pumping laser diode; an erbium doped fiber-added optical fiber; a wavelength division multiplier fiber coupler; a dispersion shifted fiber; and an optical fiber directional coupler; a nonlinear amplifier loop mirror; a second polarization controller; a linear mirror having a Faraday rotator mirror for rotating the polarization plane of a proceeding light wave; and a directional coupler being connected between the nonlinear amplifier loop mirror and the linear mirror.