Technical and commercial bids in independent sealed envelopes are invited for the purchase of programmable optical filter with the following specifications. Specifications Required: Operating wavelength : 1530 – 1560 nmCenter frequency of the filter : Tunable across the wavelength rangeFilter Bandwidth : Tunable ; minimum of 10 GHz Insertion Loss : < 1 dBPolarisation Dependent Loss : < 1 dBReturn Loss : > 25 dBFilter Shape