摘要:
Circuitry for monitoring the operation of an optoelectronic transceiver includes a sequence of interconnected signal processing circuits for processing an analog input signal and producing a digital result signal, where the analog signal represents one or more operating conditions of the optoelectronic transceiver. The sequence of signal processing circuits include gain circuitry for amplifying or attenuating the analog input signal by a gain value to produce a scaled analog signal, an analog to digital converter for converting the scaled analog signal into a first digital signal, and digital adjustment circuitry for digitally adjusting the first digital signal to produce the digital result signal. The digital adjustment circuitry includes shifting circuitry configured to shift an input digital signal in accordance with a shift value so as to produce a digital shifted signal. The digital result signal is stored in memory in predefined locations accessible by a host.
摘要:
A transmitter optical subassembly includes an optical emitter and a fiber receptacle within which an optical fiber is received. An optical limiting element is positioned between the optical emitter and the fiber receptacle. When an optical signal is emitted from the optical emitter, the optical signal passes through the optical limiting element before the optical signal reaches the fiber receptacle and is received the optical fiber. The optical limiting element has a property such that if the power of the optical signal entering the optical limiting element exceeds a predetermined limit, the power of the optical signal is optically attenuated so that the power of the optical signal exiting the optical limiting element remains below a predetermined limit.
摘要:
A system and method of minimizing the amount of power that is used by an optoelectronic module is disclosed. The system uses a thermoelectric cooler (TEC) to maintain a case temperature of the module at about 50°C. This allows the TEC to operate in the much more efficient heating mode, thus minimizing the amount of current being used to maintain the module temperature. The method includes the steps of determining a temperature range and operating temperature for an optoelectronic module, such that a maximum current level is not exceeded. In one exemplary embodiment, an operating temperature of about 50°C with a temperature range of from about -5°C to about 75°C allows a maximum current of about 300 mA.
摘要:
Mitigating errors caused by the dispersion of optical or electrical signals. Errors caused by dispersion in high frequency system are mitigated by passing a received signal through an adjustable linear filter that counteracts a channel response of a channel on which the received signal has traveled to produce an electrical signal. The adjustable linear filter has a number of coefficients. A figure of merit is calculated for the electrical signal, where the figure of merit includes the second and fourth moments of the electrical signal. The coefficients of the linear filter are adjusted based on the value of the figure of merit so as to minimize the figure of merit.
摘要:
Methods and devices for handling wafers during wafer processing are provided. One embodiment includes an apparatus for holding a wafer. The holding apparatus includes a pocket for receiving a wafer, and may include a mechanism allowing for the wafer to be secured within the pocket. Methods are also included for preparing a wafer for fabrication processes by the use of a wafer holding apparatus. These methods may include applying a layer of photoresist to the surface of a wafer.
摘要:
Optical micro-modules include a laser mount having an integrated light emitter, an integrated lens holder, and an integrated microlens. The microlens, which preferably collimates light received from the light emitter, is attached to a front surface of the lens holder and aligned with the light emitter. The light emitter and the lens holder are affixed side by side on a substrate in the micro module so that the microlens can be aligned with the light emitter during fabrication of the micro-module at the wafer level rather than during later assembly. A ball lens may optionally be used to focus the light exiting the microlens into an optical fiber. An optical isolator, a thermoelectric cooler, and/or a back monitor, such as a wavelength locker, are also preferably incorporated.
摘要:
A small form factor optical transceiver module is provided that includes a housing within which are disposed an optical transmitter and an optical receiver. A controller IC is also disposed in the housing and includes a serial digital interface configured to facilitate communication between the controller IC and a host. Among other things, the 1o serial digital interface enables access to onboard digital diagnostics while substantially conforming with the standardized packaging, footprint, and form factor of a standardized optical transceiver module. Further, the use of memory map locations in the controller IC enables the implementation of various types of host accessible diagnostic and other functionalities in the optical transceiver module.
摘要:
Bi-directional communications modules (330, 308) are configured for propagating transmission and reception of optical data along each of dual optical cables (306, 308). The modules generally include: a first transmitter (410) configured for transmitting data on a first wavelength channel onto a first optical fiber; a first receiver (414) configured for receiving data on a second wavelength channel from the first optical fiber; a second transmitter (412) configured for transmitting data on the second wavelength channel onto a second optical fiber; and a second receiver (416) configured for receiving data on the first wavelength channel from the second optical fiber. By changing the use of the dual optical cables from unidirectional traffic to bi-directional traffic, the modules thereby double the data transmission capacity of the cables without changing the size of the cables or transceiver modules or requiring the installation of new cables.
摘要:
Systems and methods are provided for configuring an optoelectronic device (100) so as to control various operating conditions at various temperatures. The method includes operating the optoelectronic device (100) at a first temperature, adjusting a first control parameter of the optoelectronic device (100) to satisfy a first operating requirement and recording an associated first value of the first control parameter. Further, the method includes operating the optoelectronic device (100) at a second temperature, adjusting the first control parameter of the optoelectronic device (100) to satisfy the first operating requirement, and recording an associated second value of the first control parameter. From the first and second recorded values of the first control parameter, a sequence of values for the first control parameter for a corresponding sequence of temperatures in a predefined range of temperatures is determined and stored in a programmable device (100) within the device. In addition, one or more control parameters may be adjusted at each temperature to satisfy one or more operating requirements.
摘要:
A microprocessor (200) is used to control the temperature of a laser emitter (112) and thereby regulate the wavelength of optical signals from the laser. A serial interface (15, 16) in the microprocessor provides input and output lines to a host device, and temperature lookup tables are stored in nonvolatile memory. Control logic processes information stored in the memory as well as information on operating conditions of the laser emitter to precisely control the temperature of the laser emitter. A thermoelectric cooler (114) adjusts the temperature of the laser emitter.