Compact ferrule-top nano-mechanical resonators with all-fiber optical interrogation are demonstrated. The resonators comprise of a suspended multi-layer graphene film supported by a ceramic ferrule with a bore diameter of 125 μm. The mechanical resonance of the graphene film is excited and detected via a single optical fiber cable, and experimental test shows that the resonant frequency and quality factor of the resonators are in the range of 170-520 kHz and 58.4-250, respectively. The integration of graphene resonator with optical fiber transmission and interrogation would allow the development of practical fiber-optic sensors for force, mass and pressure measurements.
Highly birefringent (Hi-Bi) microfiber-based fiber loop mirrors (FLMs) are studied for gas pressure measurement. A elliptical microfiber is made by tapering a femtosecond laser-processed single mode fiber and demonstrated a very high birefringence of up to 10-2 . The microfiber is housed within a pressure tube with which gas pressure measurement is carried out. The robust microfiber sensor demonstrates a pressure sensitivity of 6 pm/kPa with a temperature cross-sensitivity of less than 0.01 nm/K.
We report the fabrication of in-line fiber-optic photonic microcells by post-processing commercial photonic crystal fibers. With such microcells, novel photonic devices such as in-fiber amplifiers, grating filters, and accelerometers are created.
Chip-on-carrier (CoC) sub-assemblies of Digital Ssupermode DBR (DSDBR) lasers are produced in high volume within
Bookham manufacturing plants. These lasers can cover more than 100 ITU channels with a 50GHz channel range across
the C or L band with a minimum 13dBm output power and 40dB side mode suppression ratio (SMSR). To guarantee a
high quality and ensure a good yield, an automated screening process has been put in place at the CoC level to eliminate
poor devices. Typical tuning maps and key performance features of the device are shown in this paper. We describe the
general features of the tuning map, and indicate how a suitable operating point can be determined. The use of automated
test kit is also described in this article. Finally, the performance of our device is presented in detail.
The structure of the optical path of a novel VOA integrated receiver is presented. The method to enhance the attenuation performance of the Receiver is described in detail. The standard coplanar package module exhibits a fluent attenuation curve and can achieve more than -20dB attenuation at ~ 6.5V drive voltage. S21, S22 performance and specifications of the module are explained in the paper. All these features provide customers considerable benefits, including high quality, low power consumption and cost, board real estate flexibility and ease of use.